{"id":702,"date":"2026-02-07T00:28:06","date_gmt":"2026-02-06T16:28:06","guid":{"rendered":"https:\/\/blog.itsmygo.uk\/2026\/02\/07\/%e3%80%90typescript-%e5%85%a5%e9%96%80%e6%95%99%e5%ad%b8%e3%80%9105-%e6%b3%9b%e5%9e%8b%e5%85%a5%e9%96%80%ef%bc%9a%e8%ae%93%e5%9e%8b%e5%88%a5%e4%b9%9f%e8%83%bd%e7%95%b6%e5%8f%83%e6%95%b8\/"},"modified":"2026-02-07T00:41:33","modified_gmt":"2026-02-06T16:41:33","slug":"%e3%80%90typescript-%e5%85%a5%e9%96%80%e6%95%99%e5%ad%b8%e3%80%9105-%e6%b3%9b%e5%9e%8b%e5%85%a5%e9%96%80%ef%bc%9a%e8%ae%93%e5%9e%8b%e5%88%a5%e4%b9%9f%e8%83%bd%e7%95%b6%e5%8f%83%e6%95%b8","status":"publish","type":"post","link":"https:\/\/blog.itsmygo.uk\/wordpress\/2026\/02\/07\/%e3%80%90typescript-%e5%85%a5%e9%96%80%e6%95%99%e5%ad%b8%e3%80%9105-%e6%b3%9b%e5%9e%8b%e5%85%a5%e9%96%80%ef%bc%9a%e8%ae%93%e5%9e%8b%e5%88%a5%e4%b9%9f%e8%83%bd%e7%95%b6%e5%8f%83%e6%95%b8\/","title":{"rendered":"\u3010TypeScript \u5165\u9580\u6559\u5b78\u3011#05 \u6cdb\u578b\u5165\u9580\uff1a\u8b93\u578b\u5225\u4e5f\u80fd\u7576\u53c3\u6578"},"content":{"rendered":"\n<div id=\"quiz-2c1d9e8a\">\n<style>\n#quiz-2c1d9e8a .question {\n        background: white;\n        border-radius: 8px;\n        padding: 20px;\n        margin: 20px 0;\n        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);\n      }#quiz-2c1d9e8a .question h3 {\n        margin-top: 0;\n        color: #333;\n      }#quiz-2c1d9e8a .options {\n        list-style: none;\n        padding: 0;\n      }#quiz-2c1d9e8a .options li {\n        padding: 12px 15px;\n        margin: 8px 0;\n        border: 2px solid #ddd;\n        border-radius: 6px;\n        cursor: pointer;\n        transition: all 0.2s;\n      }#quiz-2c1d9e8a .options li:hover:not(.disabled) {\n        border-color: #4caf50;\n        background: #f0fff0;\n      }#quiz-2c1d9e8a .options li.correct {\n        border-color: #4caf50;\n        background: #e8f5e9;\n      }#quiz-2c1d9e8a .options li.wrong {\n        border-color: #f44336;\n        background: #ffebee;\n      }#quiz-2c1d9e8a .options li.disabled {\n        cursor: default;\n        opacity: 0.7;\n      }#quiz-2c1d9e8a .options li.show-answer {\n        border-color: #4caf50;\n        background: #e8f5e9;\n      }#quiz-2c1d9e8a .feedback {\n        margin-top: 15px;\n        padding: 12px;\n        border-radius: 6px;\n        display: none;\n      }#quiz-2c1d9e8a .feedback.correct {\n        background: #e8f5e9;\n        color: #2e7d32;\n        display: block;\n      }#quiz-2c1d9e8a .feedback.wrong {\n        background: #ffebee;\n        color: #c62828;\n        display: block;\n      }#quiz-2c1d9e8a .score {\n        text-align: center;\n        font-size: 1.5em;\n        padding: 20px;\n        background: white;\n        border-radius: 8px;\n        margin-top: 20px;\n      }#quiz-2c1d9e8a .code-block {\n        background: #1e1e1e;\n        color: #d4d4d4;\n        padding: 14px;\n        border-radius: 6px;\n        font-family: \"Monaco\", \"Consolas\", \"Courier New\", monospace;\n        font-size: 0.9em;\n        overflow-x: auto;\n        margin: 12px 0;\n        white-space: pre-wrap;\n      }\n<\/style>\n<h1>\u6e2c\u9a57\uff1aTypeScript \u6cdb\u578b\u5165\u9580<\/h1>\n    <p>\u5171 5 \u984c\uff0c\u9ede\u9078\u7b54\u6848\u5f8c\u6703\u7acb\u5373\u986f\u793a\u7d50\u679c<\/p>\n\n    <div class=\"question\" id=\"q1\">\n      <h3>1. \u6cdb\u578b\uff08Generics\uff09\u6700\u6838\u5fc3\u7684\u6982\u5ff5\u662f\u4ec0\u9ebc\uff1f<\/h3>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(1, 'A', 'B')\">A. \u8b93\u51fd\u5f0f\u53ef\u4ee5\u63a5\u6536\u591a\u500b\u53c3\u6578<\/li>\n        <li onclick=\"checkAnswer(1, 'B', 'B')\">B. \u8b93\u578b\u5225\u4e5f\u80fd\u7576\u53c3\u6578\u50b3\u905e\uff0c\u5beb\u4e00\u6b21\u9069\u7528\u6240\u6709\u578b\u5225<\/li>\n        <li onclick=\"checkAnswer(1, 'C', 'B')\">C. \u8b93 TypeScript \u81ea\u52d5\u5e6b\u4f60\u5beb\u7a0b\u5f0f\u78bc<\/li>\n        <li onclick=\"checkAnswer(1, 'D', 'B')\">D. \u8b93 JavaScript \u652f\u63f4\u5f37\u578b\u5225\u6aa2\u67e5<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb1\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q2\">\n      <h3>2. \u5728\u6cdb\u578b\u547d\u540d\u6163\u4f8b\u4e2d\uff0c<code>&lt;K, V&gt;<\/code> \u901a\u5e38\u4ee3\u8868\u4ec0\u9ebc\uff1f<\/h3>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(2, 'A', 'C')\">A. Kind\uff08\u7a2e\u985e\uff09\u548c Variable\uff08\u8b8a\u6578\uff09<\/li>\n        <li onclick=\"checkAnswer(2, 'B', 'C')\">B. \u5169\u500b\u901a\u7528\u578b\u5225\u53c3\u6578\uff0c\u6c92\u6709\u7279\u6b8a\u542b\u7fa9<\/li>\n        <li onclick=\"checkAnswer(2, 'C', 'C')\">C. Key\uff08\u9375\uff09\u548c Value\uff08\u503c\uff09\uff0c\u7528\u65bc\u8655\u7406\u9375\u503c\u5c0d<\/li>\n        <li onclick=\"checkAnswer(2, 'D', 'C')\">D. Keyword\uff08\u95dc\u9375\u5b57\uff09\u548c Validator\uff08\u9a57\u8b49\u5668\uff09<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb2\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q3\">\n      <h3>3. \u4ee5\u4e0b\u7a0b\u5f0f\u78bc\u4e2d\uff0c<code>Promise&lt;User&gt;<\/code> \u4ee3\u8868\u4ec0\u9ebc\u610f\u601d\uff1f<\/h3>\n      <div class=\"code-block\">const result: Promise&lt;User&gt; = fetchUser();<\/div>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(3, 'A', 'B')\">A. \u4e00\u500b User \u578b\u5225\u7684\u540c\u6b65\u56de\u50b3\u503c<\/li>\n        <li onclick=\"checkAnswer(3, 'B', 'B')\">B. \u4e00\u500b\u672a\u4f86\u6703\u62ff\u5230 User \u7684\u975e\u540c\u6b65\u7d50\u679c<\/li>\n        <li onclick=\"checkAnswer(3, 'C', 'B')\">C. \u4e00\u500b\u53ef\u80fd\u662f User \u4e5f\u53ef\u80fd\u662f null \u7684\u503c<\/li>\n        <li onclick=\"checkAnswer(3, 'D', 'B')\">D. \u4e00\u500b\u5305\u542b\u591a\u500b User \u7684\u9663\u5217<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb3\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q4\">\n      <h3>4. \u4ee5\u4e0b\u6cdb\u578b\u51fd\u5f0f\u7684\u4f5c\u7528\u662f\u4ec0\u9ebc\uff1f<\/h3>\n      <div class=\"code-block\">function swap&lt;T, U&gt;(a: T, b: U): [U, T] {\n    return [b, a];\n}<\/div>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(4, 'A', 'D')\">A. \u5c07\u5169\u500b\u76f8\u540c\u578b\u5225\u7684\u503c\u5408\u4f75\u6210\u9663\u5217<\/li>\n        <li onclick=\"checkAnswer(4, 'B', 'D')\">B. \u8907\u88fd\u5169\u500b\u503c\u4e26\u56de\u50b3\u526f\u672c<\/li>\n        <li onclick=\"checkAnswer(4, 'C', 'D')\">C. \u5c07\u5169\u500b\u503c\u8f49\u63db\u70ba\u540c\u4e00\u578b\u5225\u5f8c\u56de\u50b3<\/li>\n        <li onclick=\"checkAnswer(4, 'D', 'D')\">D. \u63a5\u6536\u5169\u500b\u4e0d\u540c\u578b\u5225\u7684\u503c\uff0c\u4ea4\u63db\u9806\u5e8f\u5f8c\u56de\u50b3<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb4\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q5\">\n      <h3>5. \u4ee5\u4e0b\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u547c\u53eb <code>getLength(123)<\/code> \u6703\u767c\u751f\u4ec0\u9ebc\u4e8b\uff1f<\/h3>\n      <div class=\"code-block\">function getLength&lt;T extends { length: number }&gt;(arg: T): number {\n    return arg.length;\n}<\/div>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(5, 'A', 'C')\">A. \u56de\u50b3 3\uff0c\u56e0\u70ba 123 \u6709\u4e09\u4f4d\u6578<\/li>\n        <li onclick=\"checkAnswer(5, 'B', 'C')\">B. \u56de\u50b3 undefined\uff0c\u56e0\u70ba number \u6c92\u6709 length<\/li>\n        <li onclick=\"checkAnswer(5, 'C', 'C')\">C. \u7de8\u8b6f\u932f\u8aa4\uff0c\u56e0\u70ba number \u578b\u5225\u6c92\u6709 length \u5c6c\u6027\uff0c\u4e0d\u7b26\u5408\u6cdb\u578b\u7d04\u675f<\/li>\n        <li onclick=\"checkAnswer(5, 'D', 'C')\">D. \u57f7\u884c\u6642\u62cb\u51fa\u4f8b\u5916\u932f\u8aa4<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb5\"><\/div>\n    <\/div>\n\n    <div class=\"score\" id=\"score\" style=\"display:none;\"><\/div>\n<script>\n\n      let answered = 0;\n      let correct = 0;\n      const total = 5;\n      const explanations = {\n        1: \"\u6cdb\u578b\u7684\u6838\u5fc3\u6982\u5ff5\u5c31\u662f\u300c\u578b\u5225\u4e5f\u53ef\u4ee5\u7576\u53c3\u6578\u50b3\u300d\u3002\u6587\u7ae0\u958b\u982d\u7528 wrapInArray \u7bc4\u4f8b\u8aaa\u660e\uff1a\u4e0d\u9700\u8981\u70ba\u6bcf\u7a2e\u578b\u5225\u5beb\u4e00\u4efd\u51fd\u5f0f\uff0c\u7528\u6cdb\u578b\u5beb\u4e00\u6b21\u5c31\u80fd\u9069\u7528\u6240\u6709\u578b\u5225\u3002\",\n        2: \"\u6839\u64da\u6587\u7ae0\u7684\u547d\u540d\u6163\u4f8b\u8868\uff0cK \u4ee3\u8868 Key\uff08\u9375\uff09\uff0cV \u4ee3\u8868 Value\uff08\u503c\uff09\u3002\u770b\u5230 &lt;K, V&gt; \u5c31\u77e5\u9053\u662f\u5728\u8655\u7406\u300c\u9375\u503c\u5c0d\u300d\u7684\u5834\u666f\u3002\",\n        3: \"\u6587\u7ae0\u7684\u5167\u5efa\u6cdb\u578b\u901f\u67e5\u8868\u660e\u78ba\u6307\u51fa\uff1aPromise&lt;User&gt; \u8868\u793a\u300c\u672a\u4f86\u6703\u62ff\u5230 User \u7684\u975e\u540c\u6b65\u7d50\u679c\u300d\u3002\u9019\u662f\u6cdb\u578b\u642d\u914d Promise \u6700\u5e38\u898b\u7684\u7528\u6cd5\u3002\",\n        4: \"\u9019\u500b\u51fd\u5f0f\u4f7f\u7528\u4e86\u5169\u500b\u578b\u5225\u53c3\u6578 T \u548c U\uff0c\u63a5\u6536\u578b\u5225\u5206\u5225\u70ba T \u548c U \u7684\u5169\u500b\u503c\uff0c\u56de\u50b3\u578b\u5225\u70ba [U, T] \u7684 tuple\uff0c\u4e5f\u5c31\u662f\u4ea4\u63db\u4e86\u9806\u5e8f\u3002\u6587\u7ae0\u4e2d\u4e5f\u7d66\u51fa\u4e86 swap(\\\"hello\\\", 42) \u56de\u50b3 [number, string] \u7684\u7bc4\u4f8b\u3002\",\n        5: \"\u6cdb\u578b\u7d04\u675f T extends { length: number } \u8868\u793a T \u5fc5\u9808\u6709 length \u5c6c\u6027\u3002number \u578b\u5225\u6c92\u6709 length \u5c6c\u6027\uff0c\u6240\u4ee5\u5728\u7de8\u8b6f\u968e\u6bb5\u5c31\u6703\u5831\u932f\uff0c\u4e0d\u6703\u7b49\u5230\u57f7\u884c\u6642\u624d\u51fa\u554f\u984c\u3002\u9019\u5c31\u662f\u6cdb\u578b\u7d04\u675f\u7684\u4f5c\u7528\uff1a\u5728\u7de8\u8b6f\u671f\u9650\u5236\u53ef\u63a5\u53d7\u7684\u578b\u5225\u7bc4\u570d\u3002\"\n      };\n\n      function checkAnswer(qNum, selected, correctAns) {\n        const question = document.getElementById(\"q\" + qNum);\n        if (question.classList.contains(\"answered\")) return;\n\n        question.classList.add(\"answered\");\n        answered++;\n\n        const options = question.querySelectorAll(\".options li\");\n        options.forEach((opt) => {\n          opt.classList.add(\"disabled\");\n          if (opt.textContent.startsWith(correctAns + \".\")) {\n            opt.classList.add(\"show-answer\");\n          }\n        });\n\n        const feedback = document.getElementById(\"fb\" + qNum);\n        if (selected === correctAns) {\n          correct++;\n          feedback.className = \"feedback correct\";\n          feedback.innerHTML = \"\u2713 \u6b63\u78ba\uff01\" + explanations[qNum];\n        } else {\n          feedback.className = \"feedback wrong\";\n          feedback.innerHTML =\n            \"\u2717 \u932f\u8aa4\u3002\u6b63\u78ba\u7b54\u6848\u662f \" + correctAns + \"\u3002\" + explanations[qNum];\n          options.forEach((opt) => {\n            if (opt.textContent.startsWith(selected + \".\")) {\n              opt.classList.add(\"wrong\");\n            }\n          });\n        }\n\n        if (answered === total) {\n          const scoreDiv = document.getElementById(\"score\");\n          scoreDiv.style.display = \"block\";\n          scoreDiv.innerHTML =\n            \"\u6e2c\u9a57\u5b8c\u6210\uff01\u5f97\u5206\uff1a\" +\n            correct +\n            \" \/ \" +\n            total +\n            (correct === total\n              ? \" \ud83c\udf89 \u5168\u5c0d\uff01\"\n              : correct >= Math.ceil(total * 0.6)\n                ? \" \ud83d\udc4d \u4e0d\u932f\uff01\"\n                : \" \ud83d\udcda \u518d\u8907\u7fd2\u4e00\u4e0b\u5427\");\n        }\n      }\n    \n<\/script>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u53e5\u8a71\u8aaa\u660e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6cdb\u578b\u5c31\u662f\u300c\u578b\u5225\u7684\u53c3\u6578\u300d\uff0c\u8b93\u540c\u4e00\u6bb5\u7a0b\u5f0f\u78bc\u80fd\u5c0d\u61c9\u4e0d\u540c\u7684\u578b\u5225\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u70ba\u4ec0\u9ebc\u9700\u8981\u6cdb\u578b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8a2d AI \u5e6b\u4f60\u5beb\u4e86\u4e00\u500b\u300c\u628a\u6771\u897f\u5305\u9032\u9663\u5217\u300d\u7684\u51fd\u5f0f\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\"><span><code class=\"hljs\">function wrapInArray(value: string): string&#91;] {\n    return &#91;value];\n}\n<\/code><\/span><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u9019\u53ea\u80fd\u5305\u5b57\u4e32\u3002\u5982\u679c\u4f60\u4e5f\u60f3\u5305\u6578\u5b57\u5462\uff1f\u96e3\u9053\u8981\u518d\u5beb\u4e00\u4efd\uff1f<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\"><span><code class=\"hljs\">function wrapNumberInArray(value: number): number&#91;] {\n    return &#91;value];\n}\n<\/code><\/span><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u9019\u592a\u8822\u4e86\u3002\u6cdb\u578b\u5c31\u662f\u89e3\u6c7a\u9019\u500b\u554f\u984c\u7684\uff1a<strong>\u5beb\u4e00\u6b21\uff0c\u9069\u7528\u6240\u6709\u578b\u5225<\/strong>\u3002<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"HTML, XML\" data-shcb-language-slug=\"xml\"><span><code class=\"hljs language-xml\">function wrapInArray<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">T<\/span>&gt;<\/span>(value: T): T&#91;] {\n    return &#91;value];\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">HTML, XML<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">xml<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7ffb\u8b6f<\/strong>\uff1a\u300c\u9019\u500b\u51fd\u5f0f\u63a5\u6536\u4e00\u500b\u67d0\u7a2e\u578b\u5225 T \u7684\u503c\uff0c\u56de\u50b3\u4e00\u500b T \u9663\u5217\u3002\u81f3\u65bc T \u662f\u4ec0\u9ebc\uff0c\u7528\u7684\u6642\u5019\u518d\u6c7a\u5b9a\u3002\u300d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6700\u5c0f\u7bc4\u4f8b<\/h2>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">identity<\/span>&lt;<span class=\"hljs-title\">T<\/span>&gt;(<span class=\"hljs-params\">arg: T<\/span>): <span class=\"hljs-title\">T<\/span> <\/span>{\n    <span class=\"hljs-keyword\">return<\/span> arg;\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u9019\u662f\u6700\u7d93\u5178\u7684\u6cdb\u578b\u7bc4\u4f8b\u3002\u9010\u884c\u7ffb\u8b6f\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">identity<\/span>&lt;<span class=\"hljs-title\">T<\/span>&gt;(<span class=\"hljs-params\">arg: T<\/span>): <span class=\"hljs-title\">T<\/span> <\/span>{\n<span class=\"hljs-comment\">\/\/                \u2191      \u2191    \u2191<\/span>\n<span class=\"hljs-comment\">\/\/         \u5ba3\u544a\u578b\u5225\u53c3\u6578 T  |    \u56de\u50b3\u578b\u5225\u4e5f\u662f T<\/span>\n<span class=\"hljs-comment\">\/\/                   \u53c3\u6578\u578b\u5225\u662f T<\/span>\n    <span class=\"hljs-keyword\">return<\/span> arg;\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u767d\u8a71\u7ffb\u8b6f<\/strong>\uff1a\u300c\u9019\u500b\u51fd\u5f0f\u63a5\u6536\u4ec0\u9ebc\u578b\u5225\uff0c\u5c31\u56de\u50b3\u4ec0\u9ebc\u578b\u5225\u3002\u300d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u6642\uff0cTypeScript \u6703\u81ea\u52d5\u63a8\u65b7 T \u662f\u4ec0\u9ebc\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> a = identity(<span class=\"hljs-string\">\"hello\"<\/span>);   <span class=\"hljs-comment\">\/\/ T \u88ab\u63a8\u65b7\u70ba string\uff0ca \u662f string<\/span>\n<span class=\"hljs-keyword\">const<\/span> b = identity(<span class=\"hljs-number\">42<\/span>);        <span class=\"hljs-comment\">\/\/ T \u88ab\u63a8\u65b7\u70ba number\uff0cb \u662f number<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u4e5f\u53ef\u4ee5\u624b\u52d5\u6307\u5b9a\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> a = identity&lt;string&gt;(<span class=\"hljs-string\">\"hello\"<\/span>);   <span class=\"hljs-comment\">\/\/ \u660e\u78ba\u6307\u5b9a T \u662f string<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u9010\u884c\u7ffb\u8b6f\uff1a\u89e3\u8b80 <code>&lt;T&gt;<\/code> \u8a9e\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 AI \u7522\u751f\u7684\u7a0b\u5f0f\u78bc\u88e1\uff0c\u4f60\u6703\u5927\u91cf\u770b\u5230\u89d2\u62ec\u865f <code>&lt;&gt;<\/code> \u642d\u914d\u5927\u5beb\u5b57\u6bcd\u3002\u4ee5\u4e0b\u662f\u7ffb\u8b6f\u6307\u5357\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">getFirst<\/span>&lt;<span class=\"hljs-title\">T<\/span>&gt;<span class=\"hljs-params\">(list: T&#91;])<\/span>: <span class=\"hljs-title\">T<\/span> <\/span>{\n<span class=\"hljs-comment\">\/\/               \u2191        \u2191      \u2191<\/span>\n<span class=\"hljs-comment\">\/\/          \u300c\u6211\u8981\u7528\u5230\u4e00\u7a2e\u578b\u5225\uff0c\u66ab\u6642\u53eb\u5b83 T\u300d<\/span>\n<span class=\"hljs-comment\">\/\/                    \u300c\u53c3\u6578\u662f T \u7d44\u6210\u7684\u9663\u5217\u300d<\/span>\n<span class=\"hljs-comment\">\/\/                           \u300c\u56de\u50b3\u4e00\u500b T\u300d<\/span>\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">list<\/span>&#91;<span class=\"hljs-number\">0<\/span>];\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u53ef\u4ee5\u628a <code>&lt;T&gt;<\/code> \u60f3\u6210\u51fd\u5f0f\u7684\u300c\u578b\u5225\u53c3\u6578\u300d\uff0c\u5c31\u50cf <code>(arg: T)<\/code> \u662f\u503c\u7684\u53c3\u6578\u4e00\u6a23\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5e38\u898b\u7684\u6cdb\u578b\u547d\u540d\u6163\u4f8b<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\u540d\u7a31<\/th>\n<th>\u4ee3\u8868\u7684\u610f\u601d<\/th>\n<th>\u5e38\u51fa\u73fe\u5728<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>T<\/code><\/td>\n<td>Type\uff08\u578b\u5225\uff09<\/td>\n<td>\u901a\u7528\u5834\u666f<\/td>\n<\/tr>\n<tr>\n<td><code>K<\/code><\/td>\n<td>Key\uff08\u9375\uff09<\/td>\n<td>\u7269\u4ef6\u7684 key<\/td>\n<\/tr>\n<tr>\n<td><code>V<\/code><\/td>\n<td>Value\uff08\u503c\uff09<\/td>\n<td>\u7269\u4ef6\u7684 value<\/td>\n<\/tr>\n<tr>\n<td><code>U<\/code><\/td>\n<td>\u7b2c\u4e8c\u500b\u578b\u5225<\/td>\n<td>\u9700\u8981\u5169\u500b\u578b\u5225\u53c3\u6578\u6642<\/td>\n<\/tr>\n<tr>\n<td><code>E<\/code><\/td>\n<td>Element\uff08\u5143\u7d20\uff09<\/td>\n<td>\u96c6\u5408\u3001\u9663\u5217<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u5230 <code>&lt;K, V&gt;<\/code> \u5c31\u77e5\u9053\u662f\u5728\u8655\u7406\u300c\u9375\u503c\u5c0d\u300d\uff0c\u770b\u5230 <code>&lt;T, U&gt;<\/code> \u5c31\u662f\u5728\u8655\u7406\u300c\u5169\u7a2e\u578b\u5225\u300d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u898b\u8b8a\u5316<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AI \u7522\u751f\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6cdb\u578b\u6700\u5e38\u51fa\u73fe\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u5883\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u8b8a\u5316 1\uff1a\u5167\u5efa\u6cdb\u578b\u578b\u5225<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9019\u4e9b\u4f60\u4e00\u5b9a\u6703\u9047\u5230\uff0c\u5fc5\u9808\u8a8d\u5f97\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> names: <span class=\"hljs-built_in\">Array<\/span>&lt;string&gt; = &#91;<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-string\">\"Bob\"<\/span>];\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u4e00\u500b\u88dd string \u7684\u9663\u5217\u300d<\/span>\n<span class=\"hljs-comment\">\/\/ \u7b49\u540c\u65bc string&#91;]<\/span>\n\n<span class=\"hljs-keyword\">const<\/span> response: <span class=\"hljs-built_in\">Promise<\/span>&lt;Response&gt; = fetch(<span class=\"hljs-string\">\"\/api\/users\"<\/span>);\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u4e00\u500b\u672a\u4f86\u6703\u62ff\u5230 Response \u7684 Promise\u300d<\/span>\n\n<span class=\"hljs-keyword\">const<\/span> settings: Record&lt;string, number&gt; = { <span class=\"hljs-attr\">width<\/span>: <span class=\"hljs-number\">100<\/span>, <span class=\"hljs-attr\">height<\/span>: <span class=\"hljs-number\">200<\/span> };\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300ckey \u662f string\u3001value \u662f number \u7684\u7269\u4ef6\u300d<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u901f\u67e5\u8868<\/strong>\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\u4f60\u6703\u770b\u5230<\/th>\n<th>\u610f\u601d<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>Array&lt;string&gt;<\/code><\/td>\n<td>\u5b57\u4e32\u9663\u5217\uff0c\u7b49\u540c <code>string[]<\/code><\/td>\n<\/tr>\n<tr>\n<td><code>Promise&lt;User&gt;<\/code><\/td>\n<td>\u672a\u4f86\u6703\u62ff\u5230 User \u7684\u975e\u540c\u6b65\u7d50\u679c<\/td>\n<\/tr>\n<tr>\n<td><code>Record&lt;string, number&gt;<\/code><\/td>\n<td>\u4e00\u500b key \u662f\u5b57\u4e32\u3001value \u662f\u6578\u5b57\u7684\u7269\u4ef6<\/td>\n<\/tr>\n<tr>\n<td><code>Map&lt;string, User&gt;<\/code><\/td>\n<td>\u4e00\u500b\u5b57\u4e32\u5c0d\u61c9 User \u7684 Map<\/td>\n<\/tr>\n<tr>\n<td><code>Set&lt;number&gt;<\/code><\/td>\n<td>\u4e00\u7d44\u4e0d\u91cd\u8907\u7684\u6578\u5b57<\/td>\n<\/tr>\n<tr>\n<td><code>Partial&lt;User&gt;<\/code><\/td>\n<td>User \u7684\u6240\u6709\u6b04\u4f4d\u90fd\u8b8a\u6210\u53ef\u9078<\/td>\n<\/tr>\n<tr>\n<td><code>Pick&lt;User, \"name\"&gt;<\/code><\/td>\n<td>\u53ea\u53d6 User \u7684 name \u6b04\u4f4d<\/td>\n<\/tr>\n<tr>\n<td><code>Omit&lt;User, \"password\"&gt;<\/code><\/td>\n<td>User \u53bb\u6389 password \u6b04\u4f4d<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u8b8a\u5316 2\uff1a\u6cdb\u578b\u7bad\u982d\u51fd\u5f0f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">AI \u5e38\u7528\u7bad\u982d\u51fd\u5f0f\u5beb\u6cdb\u578b\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">const<\/span> getFirst = &lt;T&gt;(<span class=\"hljs-keyword\">list<\/span>: T&#91;]): T =&gt; <span class=\"hljs-keyword\">list<\/span>&#91;<span class=\"hljs-number\">0<\/span>];\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u53d6\u5f97\u9663\u5217\u7684\u7b2c\u4e00\u500b\u5143\u7d20\uff0c\u578b\u5225\u8ddf\u9663\u5217\u5143\u7d20\u4e00\u6a23\u300d<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff1a\u5728 <code>.tsx<\/code> \u6a94\u6848\u88e1\uff08React\uff09\uff0c\u4f60\u53ef\u80fd\u770b\u5230\u9019\u7a2e\u5beb\u6cd5\uff0c\u591a\u4e86\u4e00\u500b\u9017\u865f\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">const<\/span> getFirst = &lt;T,&gt;(<span class=\"hljs-keyword\">list<\/span>: T&#91;]): T =&gt; <span class=\"hljs-keyword\">list<\/span>&#91;<span class=\"hljs-number\">0<\/span>];\n<span class=\"hljs-comment\">\/\/                 \u2191 \u9019\u500b\u9017\u865f\u662f\u70ba\u4e86\u907f\u514d JSX \u89e3\u6790\u5668\u628a &lt;T&gt; \u7576\u6210 HTML \u6a19\u7c64<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u8b8a\u5316 3\uff1a\u591a\u500b\u578b\u5225\u53c3\u6578<\/h3>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"HTML, XML\" data-shcb-language-slug=\"xml\"><span><code class=\"hljs language-xml\">function swap<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">T,<\/span> <span class=\"hljs-attr\">U<\/span>&gt;<\/span>(a: T, b: U): &#91;U, T] {\n    return &#91;b, a];\n}\n\/\/ \u7ffb\u8b6f\uff1a\u300c\u63a5\u6536\u5169\u500b\u4e0d\u540c\u578b\u5225\u7684\u503c\uff0c\u4ea4\u63db\u9806\u5e8f\u56de\u50b3\u300d\n\nconst result = swap(\"hello\", 42);   \/\/ result \u7684\u578b\u5225\u662f &#91;number, string]\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">HTML, XML<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">xml<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u8b8a\u5316 4\uff1a\u6cdb\u578b interface \u548c type<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">AI \u6700\u5e38\u7528\u6cdb\u578b\u4f86\u5b9a\u7fa9 API \u56de\u61c9\u683c\u5f0f\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-comment\">\/\/ \u5b9a\u7fa9\u901a\u7528\u7684 API \u56de\u61c9\u7d50\u69cb<\/span>\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">interface<\/span> <span class=\"hljs-title\">ApiResponse<\/span>&lt;<span class=\"hljs-title\">T<\/span>&gt; <\/span>{\n    data: T;            <span class=\"hljs-comment\">\/\/ \u5be6\u969b\u8cc7\u6599\uff0c\u578b\u5225\u7531 T \u6c7a\u5b9a<\/span>\n    status: number;     <span class=\"hljs-comment\">\/\/ HTTP \u72c0\u614b\u78bc<\/span>\n    message: string;    <span class=\"hljs-comment\">\/\/ \u8a0a\u606f<\/span>\n}\n\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6642\u6307\u5b9a T \u662f\u4ec0\u9ebc<\/span>\ntype UserResponse = ApiResponse&lt;User&gt;;\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u4e00\u500b API \u56de\u61c9\uff0c\u88e1\u9762\u7684 data \u662f User \u578b\u5225\u300d<\/span>\n\ntype ProductListResponse = ApiResponse&lt;Product&#91;]&gt;;\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u4e00\u500b API \u56de\u61c9\uff0c\u88e1\u9762\u7684 data \u662f Product \u9663\u5217\u300d<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u767d\u8a71\u7ffb\u8b6f<\/strong>\uff1a\u300cApiResponse \u662f\u4e00\u500b\u56de\u61c9\u7684\u6a21\u677f\uff0cT \u662f\u53ef\u4ee5\u66ff\u63db\u7684\u90e8\u5206\u3002\u300d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528 <code>type<\/code> \u4e5f\u53ef\u4ee5\u505a\u4e00\u6a23\u7684\u4e8b\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">type Result&lt;T&gt; = {\n    <span class=\"hljs-attr\">success<\/span>: boolean;\n    data: T | <span class=\"hljs-literal\">null<\/span>;\n    error: string | <span class=\"hljs-literal\">null<\/span>;\n};\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6cdb\u578b\u7d04\u675f\uff1a<code>extends<\/code> \u7684\u7528\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u6642\u5019\u6cdb\u578b\u4e0d\u80fd\u662f\u300c\u4efb\u4f55\u578b\u5225\u300d\uff0c\u9700\u8981\u9650\u5236\u3002\u9019\u6642\u7528 <code>extends<\/code>\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">getLength<\/span>&lt;<span class=\"hljs-title\">T<\/span> <span class=\"hljs-title\">extends<\/span> <\/span>{ length: number }&gt;(arg: T): number {\n    <span class=\"hljs-keyword\">return<\/span> arg.length;\n}\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300cT \u5fc5\u9808\u6709 length \u5c6c\u6027\uff0c\u9019\u500b\u51fd\u5f0f\u56de\u50b3\u5b83\u7684\u9577\u5ea6\u300d<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u6548\u679c\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">getLength(<span class=\"hljs-string\">\"hello\"<\/span>);      <span class=\"hljs-comment\">\/\/ OK\uff0cstring \u6709 length<\/span>\ngetLength(&#91;<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>]);    <span class=\"hljs-comment\">\/\/ OK\uff0c\u9663\u5217\u6709 length<\/span>\ngetLength(<span class=\"hljs-number\">123<\/span>);          <span class=\"hljs-comment\">\/\/ \u932f\u8aa4\uff01number \u6c92\u6709 length<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u5e38\u898b\u7684\u7d04\u675f\u5beb\u6cd5<\/h3>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"HTML, XML\" data-shcb-language-slug=\"xml\"><span><code class=\"hljs language-xml\">\/\/ \u7d04\u675f T \u5fc5\u9808\u662f\u67d0\u500b interface \u7684\u5b50\u96c6\nfunction printName<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">T<\/span> <span class=\"hljs-attr\">extends<\/span> { <span class=\"hljs-attr\">name:<\/span> <span class=\"hljs-attr\">string<\/span> }&gt;<\/span>(obj: T) {\n    console.log(obj.name);\n}\n\/\/ \u7ffb\u8b6f\uff1a\u300c\u63a5\u6536\u4efb\u4f55\u6709 name \u5c6c\u6027\u7684\u7269\u4ef6\u300d\n\n\/\/ \u7d04\u675f K \u5fc5\u9808\u662f T \u7684\u67d0\u500b key\nfunction getProperty<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">T,<\/span> <span class=\"hljs-attr\">K<\/span> <span class=\"hljs-attr\">extends<\/span> <span class=\"hljs-attr\">keyof<\/span> <span class=\"hljs-attr\">T<\/span>&gt;<\/span>(obj: T, key: K): T&#91;K] {\n    return obj&#91;key];\n}\n\/\/ \u7ffb\u8b6f\uff1a\u300c\u5f9e\u7269\u4ef6\u53d6\u51fa\u6307\u5b9a key \u7684\u503c\uff0ckey \u5fc5\u9808\u662f\u7269\u4ef6\u771f\u7684\u6709\u7684 key\u300d\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">HTML, XML<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">xml<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><code>keyof T<\/code> \u7684\u610f\u601d\u662f\u300cT \u7684\u6240\u6709 key \u7684\u96c6\u5408\u300d\u3002\u6240\u4ee5 <code>K extends keyof T<\/code> \u5c31\u662f\u300cK \u5fc5\u9808\u662f T \u7684\u67d0\u500b key\u300d\u3002<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> user = { <span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-attr\">age<\/span>: <span class=\"hljs-number\">25<\/span> };\ngetProperty(user, <span class=\"hljs-string\">\"name\"<\/span>);    <span class=\"hljs-comment\">\/\/ OK\uff0c\u56de\u50b3 string<\/span>\ngetProperty(user, <span class=\"hljs-string\">\"age\"<\/span>);     <span class=\"hljs-comment\">\/\/ OK\uff0c\u56de\u50b3 number<\/span>\ngetProperty(user, <span class=\"hljs-string\">\"email\"<\/span>);   <span class=\"hljs-comment\">\/\/ \u932f\u8aa4\uff01user \u6c92\u6709 email<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5be6\u969b\u5834\u666f\uff1aAI \u5e38\u600e\u9ebc\u7528\u6cdb\u578b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u5834\u666f 1\uff1a\u901a\u7528\u7684 API \u8acb\u6c42\u51fd\u5f0f<\/h3>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">fetchApi<\/span>&lt;<span class=\"hljs-title\">T<\/span>&gt;(<span class=\"hljs-params\">url: string<\/span>): <span class=\"hljs-title\">Promise<\/span>&lt;<span class=\"hljs-title\">T<\/span>&gt; <\/span>{\n    <span class=\"hljs-keyword\">const<\/span> response = <span class=\"hljs-keyword\">await<\/span> fetch(url);\n    <span class=\"hljs-keyword\">const<\/span> data: T = <span class=\"hljs-keyword\">await<\/span> response.json();\n    <span class=\"hljs-keyword\">return<\/span> data;\n}\n\n<span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u6642\u6307\u5b9a\u56de\u50b3\u578b\u5225<\/span>\n<span class=\"hljs-keyword\">const<\/span> user = <span class=\"hljs-keyword\">await<\/span> fetchApi&lt;User&gt;(<span class=\"hljs-string\">\"\/api\/user\/1\"<\/span>);\n<span class=\"hljs-keyword\">const<\/span> products = <span class=\"hljs-keyword\">await<\/span> fetchApi&lt;Product&#91;]&gt;(<span class=\"hljs-string\">\"\/api\/products\"<\/span>);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7ffb\u8b6f<\/strong>\uff1a\u300cfetchApi \u662f\u4e00\u500b\u901a\u7528\u7684 API \u547c\u53eb\u51fd\u5f0f\u3002\u7528\u7684\u6642\u5019\u544a\u8a34\u5b83\u56de\u50b3\u4ec0\u9ebc\u578b\u5225\uff0c\u5b83\u5c31\u6703\u5e6b\u4f60\u505a\u578b\u5225\u6aa2\u67e5\u3002\u300d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5834\u666f 2\uff1aReact \u7684 useState<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u6709\u78b0\u5230 React\uff0c\u9019\u662f\u6700\u5e38\u898b\u7684\u6cdb\u578b\u7528\u6cd5\uff1a<\/p>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-18\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">const<\/span> &#91;user, setUser] = useState&lt;User | <span class=\"hljs-literal\">null<\/span>&gt;(<span class=\"hljs-literal\">null<\/span>);\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u5efa\u7acb\u4e00\u500b state\uff0c\u503c\u53ef\u4ee5\u662f User \u6216 null\uff0c\u521d\u59cb\u503c\u662f null\u300d<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-18\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u5834\u666f 3\uff1a\u901a\u7528\u7684\u5de5\u5177\u578b\u5225<\/h3>\n\n\n<div class=\"cbc-code-wrapper\"><div class=\"cbc-code-bar\"><button class=\"cbc-copy-button\">Copy<\/button><\/div><pre class=\"wp-block-code\" aria-describedby=\"shcb-language-19\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">type Nullable&lt;T&gt; = T | <span class=\"hljs-literal\">null<\/span>;\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300cNullable&lt;User&gt; \u5c31\u662f User | null\u300d<\/span>\n\ntype AsyncFunction&lt;T&gt; = <span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> <span class=\"hljs-built_in\">Promise<\/span>&lt;T&gt;;\n<span class=\"hljs-comment\">\/\/ \u7ffb\u8b6f\uff1a\u300c\u4e00\u500b\u56de\u50b3 Promise&lt;T&gt; \u7684\u51fd\u5f0f\u300d<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-19\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5fc5\u770b\u61c2 vs \u77e5\u9053\u5c31\u597d<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u5fc5\u770b\u61c2\uff08\u6703\u4e00\u76f4\u51fa\u73fe\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><code>&lt;T&gt;<\/code> \u5728\u51fd\u5f0f\u6216\u578b\u5225\u5f8c\u9762\uff1a\u5ba3\u544a\u6cdb\u578b\u53c3\u6578<\/li>\n\n\n<li><code>Array&lt;string&gt;<\/code>\u3001<code>Promise&lt;User&gt;<\/code>\uff1a\u5167\u5efa\u6cdb\u578b\u578b\u5225<\/li>\n\n\n<li><code>ApiResponse&lt;T&gt;<\/code> \u9019\u985e\u81ea\u8a02\u6cdb\u578b interface<\/li>\n\n\n<li><code>&lt;T extends SomeType&gt;<\/code>\uff1a\u6cdb\u578b\u7d04\u675f<\/li>\n\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u77e5\u9053\u5c31\u597d\uff08\u9047\u5230\u518d\u67e5\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>\u689d\u4ef6\u578b\u5225\uff1a<code>T extends U ? X : Y<\/code>\uff0c\u578b\u5225\u7248\u7684\u4e09\u5143\u904b\u7b97<\/li>\n\n\n<li>infer \u95dc\u9375\u5b57\uff1a<code>T extends Promise&lt;infer U&gt; ? U : T<\/code>\uff0c\u5f9e\u578b\u5225\u88e1\u63d0\u53d6\u5b50\u578b\u5225<\/li>\n\n\n<li>\u6620\u5c04\u578b\u5225\uff1a<code>{ [K in keyof T]: ... }<\/code>\uff0c\u6279\u91cf\u8f49\u63db\u578b\u5225<\/li>\n\n\n<li>\u6a21\u677f\u5b57\u9762\u91cf\u578b\u5225\uff1a`<code> <\/code>${T}Changed<code> <\/code><code>\uff0c\u7528\u5b57\u4e32\u6a21\u677f\u751f\u6210\u578b\u5225\n\n\u9019\u4e9b\u9032\u968e\u7528\u6cd5\u5728\u51fd\u5f0f\u5eab\u7684\u578b\u5225\u5b9a\u7fa9\u88e1\u6703\u51fa\u73fe\uff0c\u4f46\u65e5\u5e38\u958b\u767c\u4e2d\u4e0d\u9700\u8981\u81ea\u5df1\u5beb\u3002\u9047\u5230\u6642\u77e5\u9053\u300c\u9019\u662f\u5728\u505a\u578b\u5225\u904b\u7b97\u300d\u5c31\u5920\u4e86\u3002\n\n---\n\n## Vibe Coder \u6aa2\u67e5\u9ede\n\n\u770b\u5230\u6cdb\u578b\u7a0b\u5f0f\u78bc\u6642\u78ba\u8a8d\uff1a\n\n- [ ] <\/code><T><code> \u88e1\u7684 T \u4ee3\u8868\u4ec0\u9ebc\uff1f\u80fd\u731c\u51fa\u4f86\u55ce\uff1f\uff08\u770b\u547d\u540d\u548c\u4e0a\u4e0b\u6587\uff09\n- [ ] \u4f7f\u7528\u6cdb\u578b\u51fd\u5f0f\u6642\uff0cT \u662f\u600e\u9ebc\u88ab\u6c7a\u5b9a\u7684\uff1f\uff08\u81ea\u52d5\u63a8\u65b7\u9084\u662f\u624b\u52d5\u6307\u5b9a\uff09\n- [ ] \u5982\u679c\u6709 <\/code>extends<code> \u7d04\u675f\uff0cT \u88ab\u9650\u5236\u6210\u4ec0\u9ebc\u7bc4\u570d\uff1f\n- [ ] AI \u5b9a\u7fa9\u7684\u6cdb\u578b interface\uff08\u50cf ApiResponse&lt;T&gt;\uff09\uff0cT \u5728\u5be6\u969b\u4f7f\u7528\u6642\u88ab\u66ff\u63db\u6210\u4e86\u4ec0\u9ebc\uff1f\n\n---\n\n## \u7e3d\u7d50\n\n\u6cdb\u578b\u7684\u6838\u5fc3\u6982\u5ff5\u53ea\u6709\u4e00\u500b\uff1a**\u578b\u5225\u4e5f\u53ef\u4ee5\u7576\u53c3\u6578\u50b3**\u3002\n\n| \u6982\u5ff5 | \u7a0b\u5f0f\u78bc | \u767d\u8a71\u7ffb\u8b6f |\n|------|--------|---------|\n| \u6cdb\u578b\u51fd\u5f0f | <\/code>function fn<T>(arg: T): T<code> | \u9032\u4ec0\u9ebc\u578b\u5225\uff0c\u51fa\u4ec0\u9ebc\u578b\u5225 |\n| \u6cdb\u578b interface | <\/code>interface Box<T> { value: T }<code> | \u4e00\u500b\u6a21\u677f\uff0cT \u53ef\u4ee5\u66ff\u63db |\n| \u5167\u5efa\u6cdb\u578b | <\/code>Array<string><code> | \u88dd\u5b57\u4e32\u7684\u9663\u5217 |\n| \u6cdb\u578b\u7d04\u675f | <\/code><T extends HasName><code> | T \u5fc5\u9808\u6709 name \u5c6c\u6027 |\n| \u591a\u578b\u5225\u53c3\u6578 | <\/code><K, V><code> | \u5169\u500b\u578b\u5225\u53c3\u6578\uff0c\u901a\u5e38\u662f key \u548c value |\n\n\u4e0b\u6b21\u770b\u5230 AI \u5beb\u51fa <\/code><T>` \u6642\uff0c\u5225\u614c\u3002\u628a T \u60f3\u6210\u300c\u578b\u5225\u7684\u53c3\u6578\u300d\uff0c\u5c31\u50cf\u51fd\u5f0f\u7684\u53c3\u6578\u4e00\u6a23\uff0c\u7528\u7684\u6642\u5019\u518d\u586b\u5165\u5be6\u969b\u7684\u578b\u5225\u5c31\u597d\u4e86\u3002<\/li>\n\n<\/ul>\n\n\n\n<div id=\"quiz-b5e3f657\">\n<style>\n#quiz-b5e3f657 .badge {\n        display: inline-block;\n        padding: 4px 10px;\n        border-radius: 12px;\n        font-size: 0.75em;\n        font-weight: bold;\n        margin-left: 8px;\n      }#quiz-b5e3f657 .badge.scenario {\n        background: #ebf8ff;\n        color: #2b6cb0;\n      }#quiz-b5e3f657 .badge.debug {\n        background: #fef3c7;\n        color: #92400e;\n      }#quiz-b5e3f657 .question-adv {\n        background: white;\n        border-radius: 10px;\n        padding: 24px;\n        margin: 20px 0;\n        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);\n        border-left: 4px solid #ed8936;\n      }#quiz-b5e3f657 .question-adv h3 {\n        margin-top: 0;\n        color: #2d3748;\n      }#quiz-b5e3f657 .code-block {\n        background: #1e1e1e;\n        color: #d4d4d4;\n        padding: 14px;\n        border-radius: 6px;\n        font-family: \"Menlo\", \"Monaco\", \"Courier New\", monospace;\n        font-size: 0.9em;\n        overflow-x: auto;\n        margin: 12px 0;\n        white-space: pre-wrap;\n      }#quiz-b5e3f657 .options-adv {\n        list-style: none;\n        padding: 0;\n      }#quiz-b5e3f657 .options-adv li {\n        padding: 14px 16px;\n        margin: 10px 0;\n        border: 2px solid #e2e8f0;\n        border-radius: 8px;\n        cursor: pointer;\n        transition: all 0.2s;\n      }#quiz-b5e3f657 .options-adv li:hover:not(.disabled) {\n        border-color: #ed8936;\n        background: #fffaf0;\n      }#quiz-b5e3f657 .options-adv li.disabled {\n        cursor: default;\n        opacity: 0.7;\n      }#quiz-b5e3f657 .options-adv li.show-answer {\n        border-color: #48bb78;\n        background: #f0fff4;\n      }#quiz-b5e3f657 .options-adv li.wrong {\n        border-color: #fc8181;\n        background: #fff5f5;\n      }#quiz-b5e3f657 .feedback-adv {\n        margin-top: 16px;\n        padding: 14px;\n        border-radius: 8px;\n        display: none;\n        line-height: 1.6;\n      }#quiz-b5e3f657 .feedback-adv.correct {\n        background: #f0fff4;\n        color: #276749;\n        display: block;\n      }#quiz-b5e3f657 .feedback-adv.wrong {\n        background: #fff5f5;\n        color: #c53030;\n        display: block;\n      }#quiz-b5e3f657 .feedback-adv \n      .score-adv {\n        text-align: center;\n        font-size: 1.4em;\n        padding: 24px;\n        background: white;\n        border-radius: 10px;\n        margin-top: 24px;\n        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);\n      }#quiz-b5e3f657 .intro {\n        background: #ebf8ff;\n        padding: 16px;\n        border-radius: 8px;\n        margin-bottom: 20px;\n        color: #2c5282;\n      }\n<\/style>\n<h1>\u9032\u968e\u6e2c\u9a57\uff1aTypeScript \u6cdb\u578b\u5165\u9580<\/h1>\n    <div class=\"intro\">\n      <strong>\u6e2c\u9a57\u76ee\u6a19\uff1a<\/strong>\u9a57\u8b49\u4f60\u662f\u5426\u80fd\u5728\u5be6\u969b\u60c5\u5883\u4e2d\u61c9\u7528\u6240\u5b78\u3002<br \/>\n      \u5171 5 \u984c\uff0c\u5305\u542b\u60c5\u5883\u984c\u8207\u932f\u8aa4\u8a3a\u65b7\u984c\u3002\n    <\/div>\n\n    <!-- \u60c5\u5883\u984c 1 -->\n    <div class=\"question-adv\" id=\"qAdv1\">\n      <h3>1. \u4f60\u6b63\u5728\u958b\u767c\u4e00\u500b\u5f8c\u7aef API\uff0c\u9700\u8981\u70ba\u4e0d\u540c\u7684\u8cc7\u6e90\uff08User\u3001Product\u3001Order\uff09\u8a2d\u8a08\u7d71\u4e00\u7684\u56de\u61c9\u683c\u5f0f\uff0c\u90fd\u5305\u542b <code>data<\/code>\u3001<code>status<\/code>\u3001<code>message<\/code> \u4e09\u500b\u6b04\u4f4d\uff0c\u4f46 <code>data<\/code> \u7684\u578b\u5225\u6703\u96a8\u8cc7\u6e90\u4e0d\u540c\u800c\u6539\u8b8a\u3002\u6700\u4f73\u7684\u505a\u6cd5\u662f\u4ec0\u9ebc\uff1f <span class=\"badge scenario\">\u60c5\u5883\u984c<\/span><\/h3>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(1, 'A', 'C')\">A. \u70ba\u6bcf\u7a2e\u8cc7\u6e90\u5404\u5beb\u4e00\u500b interface\uff1a<code>UserResponse<\/code>\u3001<code>ProductResponse<\/code>\u3001<code>OrderResponse<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(1, 'B', 'C')\">B. \u5c07 <code>data<\/code> \u7684\u578b\u5225\u8a2d\u70ba <code>any<\/code>\uff0c\u9019\u6a23\u4ec0\u9ebc\u8cc7\u6599\u90fd\u80fd\u653e<\/li>\n        <li onclick=\"checkAnswerAdv(1, 'C', 'C')\">C. \u5b9a\u7fa9\u6cdb\u578b interface <code>ApiResponse&lt;T&gt;<\/code>\uff0c\u4f7f\u7528\u6642\u6307\u5b9a T \u70ba\u4e0d\u540c\u7684\u8cc7\u6e90\u578b\u5225<\/li>\n        <li onclick=\"checkAnswerAdv(1, 'D', 'C')\">D. \u7528 union type <code>User | Product | Order<\/code> \u4f5c\u70ba <code>data<\/code> \u7684\u578b\u5225<\/li>\n      <\/ul>\n      <div class=\"feedback-adv\" id=\"fbAdv1\"><\/div>\n    <\/div>\n\n    <!-- \u60c5\u5883\u984c 2 -->\n    <div class=\"question-adv\" id=\"qAdv2\">\n      <h3>2. \u4f60\u9700\u8981\u5beb\u4e00\u500b\u5de5\u5177\u51fd\u5f0f\uff0c\u5f9e\u4efb\u610f\u7269\u4ef6\u4e2d\u5b89\u5168\u5730\u53d6\u51fa\u67d0\u500b\u5c6c\u6027\u7684\u503c\u3002\u4f60\u5e0c\u671b TypeScript \u5728\u7de8\u8b6f\u671f\u5c31\u80fd\u6aa2\u67e5 key \u662f\u5426\u5408\u6cd5\uff0c\u800c\u4e14\u56de\u50b3\u503c\u7684\u578b\u5225\u8981\u7cbe\u78ba\u3002\u4ee5\u4e0b\u54ea\u7a2e\u5beb\u6cd5\u6700\u5408\u9069\uff1f <span class=\"badge scenario\">\u60c5\u5883\u984c<\/span><\/h3>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(2, 'A', 'B')\">A. <code>function getProp(obj: any, key: string): any<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(2, 'B', 'B')\">B. <code>function getProp&lt;T, K extends keyof T&gt;(obj: T, key: K): T[K]<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(2, 'C', 'B')\">C. <code>function getProp&lt;T&gt;(obj: T, key: string): T<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(2, 'D', 'B')\">D. <code>function getProp&lt;T&gt;(obj: Record&lt;string, T&gt;, key: string): T<\/code><\/li>\n      <\/ul>\n      <div class=\"feedback-adv\" id=\"fbAdv2\"><\/div>\n    <\/div>\n\n    <!-- \u60c5\u5883\u984c 3 -->\n    <div class=\"question-adv\" id=\"qAdv3\">\n      <h3>3. \u4f60\u5728 React \u5c08\u6848\u7684 <code>.tsx<\/code> \u6a94\u6848\u4e2d\u5beb\u4e86\u4e00\u500b\u6cdb\u578b\u7bad\u982d\u51fd\u5f0f\uff0c\u4f46\u7de8\u8f2f\u5668\u5831\u51fa\u8a9e\u6cd5\u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u4f60\u7684\u7a0b\u5f0f\u78bc\uff1a<span class=\"badge scenario\">\u60c5\u5883\u984c<\/span><\/h3>\n      <div class=\"code-block\">\/\/ MyComponent.tsx\nconst getFirst = &lt;T&gt;(list: T[]): T =&gt; list[0];<\/div>\n      <p>\u6700\u53ef\u80fd\u7684\u539f\u56e0\u548c\u89e3\u6c7a\u65b9\u5f0f\u662f\u4ec0\u9ebc\uff1f<\/p>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(3, 'A', 'D')\">A. \u7bad\u982d\u51fd\u5f0f\u4e0d\u652f\u63f4\u6cdb\u578b\uff0c\u5fc5\u9808\u6539\u7528 <code>function<\/code> \u5ba3\u544a<\/li>\n        <li onclick=\"checkAnswerAdv(3, 'B', 'D')\">B. <code>T<\/code> \u9700\u8981\u5148\u7528 <code>type T = unknown<\/code> \u5ba3\u544a\u624d\u80fd\u4f7f\u7528<\/li>\n        <li onclick=\"checkAnswerAdv(3, 'C', 'D')\">C. <code>.tsx<\/code> \u6a94\u6848\u4e0d\u652f\u63f4\u6cdb\u578b\u8a9e\u6cd5\uff0c\u9700\u8981\u6539\u7528 <code>.ts<\/code> \u526f\u6a94\u540d<\/li>\n        <li onclick=\"checkAnswerAdv(3, 'D', 'D')\">D. JSX \u89e3\u6790\u5668\u628a <code>&lt;T&gt;<\/code> \u7576\u6210 HTML \u6a19\u7c64\u4e86\uff0c\u5728 T \u5f8c\u9762\u52a0\u9017\u865f\u5beb\u6210 <code>&lt;T,&gt;<\/code> \u5373\u53ef\u89e3\u6c7a<\/li>\n      <\/ul>\n      <div class=\"feedback-adv\" id=\"fbAdv3\"><\/div>\n    <\/div>\n\n    <!-- \u932f\u8aa4\u8a3a\u65b7\u984c 1 -->\n    <div class=\"question-adv\" id=\"qAdv4\">\n      <h3>4. \u4ee5\u4e0b\u7a0b\u5f0f\u78bc\u5728\u7de8\u8b6f\u6642\u5831\u932f\uff0c\u554f\u984c\u51fa\u5728\u54ea\u88e1\uff1f <span class=\"badge debug\">\u932f\u8aa4\u8a3a\u65b7<\/span><\/h3>\n      <div class=\"code-block\">function logLength&lt;T&gt;(arg: T): void {\n    console.log(arg.length);  \/\/ Error: Property &#8216;length&#8217; does not exist on type &#8216;T&#8217;\n}\n\nlogLength(&#8220;hello&#8221;);\nlogLength([1, 2, 3]);<\/div>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(4, 'A', 'C')\">A. <code>T<\/code> \u4e0d\u80fd\u7528\u5728 <code>console.log<\/code> \u88e1\u9762<\/li>\n        <li onclick=\"checkAnswerAdv(4, 'B', 'C')\">B. \u547c\u53eb\u6642\u6c92\u6709\u624b\u52d5\u6307\u5b9a <code>&lt;string&gt;<\/code> \u6216 <code>&lt;number[]&gt;<\/code>\uff0c\u5c0e\u81f4\u578b\u5225\u63a8\u65b7\u5931\u6557<\/li>\n        <li onclick=\"checkAnswerAdv(4, 'C', 'C')\">C. \u6cdb\u578b <code>T<\/code> \u6c92\u6709\u52a0\u4e0a\u7d04\u675f\uff0cTypeScript \u7121\u6cd5\u78ba\u5b9a <code>T<\/code> \u4e00\u5b9a\u6709 <code>length<\/code> \u5c6c\u6027\uff0c\u9700\u6539\u70ba <code>T extends { length: number }<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(4, 'D', 'C')\">D. <code>void<\/code> \u56de\u50b3\u578b\u5225\u548c <code>console.log<\/code> \u885d\u7a81\uff0c\u61c9\u8a72\u6539\u70ba\u56de\u50b3 <code>number<\/code><\/li>\n      <\/ul>\n      <div class=\"feedback-adv\" id=\"fbAdv4\"><\/div>\n    <\/div>\n\n    <!-- \u932f\u8aa4\u8a3a\u65b7\u984c 2 -->\n    <div class=\"question-adv\" id=\"qAdv5\">\n      <h3>5. \u4ee5\u4e0b\u7a0b\u5f0f\u78bc\u7684\u578b\u5225\u5b9a\u7fa9\u6709\u4ec0\u9ebc\u554f\u984c\uff1f <span class=\"badge debug\">\u932f\u8aa4\u8a3a\u65b7<\/span><\/h3>\n      <div class=\"code-block\">interface ApiResponse {\n    data: any;\n    status: number;\n    message: string;\n}\n\nconst userRes: ApiResponse = { data: { name: &#8220;Alice&#8221; }, status: 200, message: &#8220;OK&#8221; };\n\/\/ \u4e4b\u5f8c\u4f7f\u7528 userRes.data \u6642\u6c92\u6709\u4efb\u4f55\u578b\u5225\u63d0\u793a\nconsole.log(userRes.data.name);    \/\/ \u80fd\u57f7\u884c\uff0c\u4f46 TypeScript \u4e0d\u6703\u6aa2\u67e5\nconsole.log(userRes.data.email);   \/\/ \u4e5f\u80fd\u57f7\u884c\uff0c\u4f46 email \u6839\u672c\u4e0d\u5b58\u5728\uff01<\/div>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(5, 'A', 'B')\">A. <code>interface<\/code> \u4e0d\u80fd\u5305\u542b <code>any<\/code> \u578b\u5225\uff0c\u61c9\u8a72\u7528 <code>unknown<\/code> \u4ee3\u66ff<\/li>\n        <li onclick=\"checkAnswerAdv(5, 'B', 'B')\">B. <code>data<\/code> \u7528\u4e86 <code>any<\/code> \u5931\u53bb\u578b\u5225\u6aa2\u67e5\uff0c\u61c9\u8a72\u6539\u7528\u6cdb\u578b <code>ApiResponse&lt;T&gt;<\/code>\uff0c\u8b93 <code>data: T<\/code> \u5728\u4f7f\u7528\u6642\u6307\u5b9a\u5177\u9ad4\u578b\u5225<\/li>\n        <li onclick=\"checkAnswerAdv(5, 'C', 'B')\">C. <code>status<\/code> \u61c9\u8a72\u7528 <code>string<\/code> \u800c\u4e0d\u662f <code>number<\/code>\uff0c\u9019\u5c0e\u81f4\u578b\u5225\u63a8\u65b7\u5931\u6548<\/li>\n        <li onclick=\"checkAnswerAdv(5, 'D', 'B')\">D. \u9700\u8981\u5728 <code>console.log<\/code> \u4e4b\u524d\u7528 <code>as User<\/code> \u505a\u578b\u5225\u65b7\u8a00\u624d\u80fd\u53d6\u5f97\u578b\u5225\u6aa2\u67e5<\/li>\n      <\/ul>\n      <div class=\"feedback-adv\" id=\"fbAdv5\"><\/div>\n    <\/div>\n\n    <div class=\"score-adv\" id=\"scoreAdv\" style=\"display:none;\"><\/div>\n<script>\n\n      let answeredAdv = 0;\n      let correctAdv = 0;\n      const totalAdv = 5;\n      const explanationsAdv = {\n        1: \"\u6587\u7ae0\u4e2d\u5c55\u793a\u4e86 <code>ApiResponse&lt;T&gt;<\/code> \u9019\u500b\u6cdb\u578b interface \u7684\u505a\u6cd5\uff1a\u5b9a\u7fa9\u4e00\u6b21\u901a\u7528\u7d50\u69cb\uff0c\u4f7f\u7528\u6642\u900f\u904e <code>ApiResponse&lt;User&gt;<\/code>\u3001<code>ApiResponse&lt;Product[]&gt;<\/code> \u6307\u5b9a data \u7684\u5177\u9ad4\u578b\u5225\u3002\u9078\u9805 A \u6703\u7522\u751f\u5927\u91cf\u91cd\u8907\u7a0b\u5f0f\u78bc\uff1b\u9078\u9805 B \u7528 <code>any<\/code> \u5931\u53bb\u578b\u5225\u5b89\u5168\uff1b\u9078\u9805 D \u7684 union type \u7121\u6cd5\u5728\u53d6\u7528 data \u6642\u77e5\u9053\u5177\u9ad4\u662f\u54ea\u7a2e\u578b\u5225\u3002\",\n        2: \"\u6587\u7ae0\u4e2d\u4ecb\u7d39\u4e86 <code>getProperty&lt;T, K extends keyof T&gt;(obj: T, key: K): T[K]<\/code> \u9019\u500b\u7d93\u5178\u5beb\u6cd5\u3002<code>K extends keyof T<\/code> \u78ba\u4fdd key \u5fc5\u9808\u662f\u7269\u4ef6\u771f\u7684\u6709\u7684 key\uff0c\u800c\u56de\u50b3\u578b\u5225 <code>T[K]<\/code> \u6703\u7cbe\u78ba\u5c0d\u61c9\u8a72\u5c6c\u6027\u7684\u578b\u5225\u3002\u9078\u9805 A \u5168\u7528 <code>any<\/code> \u5931\u53bb\u578b\u5225\u6aa2\u67e5\uff1b\u9078\u9805 C \u7684 key \u662f <code>string<\/code> \u7121\u6cd5\u9650\u5236\u5408\u6cd5\u7684 key\uff1b\u9078\u9805 D \u5047\u8a2d\u6240\u6709 value \u90fd\u662f\u540c\u578b\u5225\uff0c\u4e0d\u7b26\u5408\u4e00\u822c\u7269\u4ef6\u7684\u60c5\u6cc1\u3002\",\n        3: \"\u6587\u7ae0\u660e\u78ba\u6307\u51fa\uff1a\u5728 <code>.tsx<\/code> \u6a94\u6848\u4e2d\uff0cJSX \u89e3\u6790\u5668\u6703\u628a <code>&lt;T&gt;<\/code> \u7576\u6210 HTML \u6a19\u7c64\u3002\u89e3\u6c7a\u65b9\u5f0f\u662f\u5728\u578b\u5225\u53c3\u6578\u5f8c\u52a0\u9017\u865f\uff0c\u5beb\u6210 <code>&lt;T,&gt;<\/code>\u3002\u7bad\u982d\u51fd\u5f0f\u672c\u8eab\u662f\u652f\u63f4\u6cdb\u578b\u7684\uff0c<code>.tsx<\/code> \u6a94\u6848\u4e5f\u652f\u63f4\u6cdb\u578b\u8a9e\u6cd5\uff0c\u53ea\u662f\u9700\u8981\u9019\u500b\u5c0f\u6280\u5de7\u4f86\u907f\u514d\u89e3\u6790\u885d\u7a81\u3002\",\n        4: \"\u7576\u6cdb\u578b <code>T<\/code> \u6c92\u6709\u4efb\u4f55\u7d04\u675f\u6642\uff0cTypeScript \u6703\u628a\u5b83\u7576\u6210\u6700\u901a\u7528\u7684\u578b\u5225\u8655\u7406\uff0c\u7121\u6cd5\u4fdd\u8b49\u5b83\u6709 <code>length<\/code> \u5c6c\u6027\u3002\u6587\u7ae0\u4e2d\u7528 <code>T extends { length: number }<\/code> \u4f5c\u70ba\u6cdb\u578b\u7d04\u675f\u7684\u7bc4\u4f8b\uff0c\u660e\u78ba\u8aaa\u660e\u9019\u6a23\u53ef\u4ee5\u9650\u5236 T \u5fc5\u9808\u6709 <code>length<\/code> \u5c6c\u6027\u3002\u624b\u52d5\u6307\u5b9a\u578b\u5225\u53c3\u6578\uff08\u9078\u9805 B\uff09\u96d6\u7136\u53ef\u884c\uff0c\u4f46\u4e0d\u662f\u6839\u672c\u89e3\u6c7a\u65b9\u5f0f\uff0c\u56e0\u70ba\u4f7f\u7528\u8005\u4ecd\u53ef\u80fd\u50b3\u5165 <code>number<\/code> \u7b49\u7121 length \u7684\u578b\u5225\u3002\",\n        5: \"\u9019\u6b63\u662f\u6587\u7ae0\u4e2d\u6cdb\u578b interface \u8981\u89e3\u6c7a\u7684\u554f\u984c\u3002\u7528 <code>any<\/code> \u5b9a\u7fa9 <code>data<\/code> \u6703\u8b93 TypeScript \u5b8c\u5168\u653e\u68c4\u5c0d data \u5167\u5bb9\u7684\u578b\u5225\u6aa2\u67e5\uff0c\u5b58\u53d6\u4e0d\u5b58\u5728\u7684\u5c6c\u6027\u4e5f\u4e0d\u6703\u5831\u932f\u3002\u6b63\u78ba\u505a\u6cd5\u662f\u6539\u7528 <code>interface ApiResponse&lt;T&gt; { data: T; ... }<\/code>\uff0c\u4f7f\u7528\u6642\u900f\u904e <code>ApiResponse&lt;User&gt;<\/code> \u6307\u5b9a\u5177\u9ad4\u578b\u5225\uff0c\u9019\u6a23 TypeScript \u5c31\u80fd\u5728\u7de8\u8b6f\u671f\u5e6b\u4f60\u6aa2\u67e5 <code>data<\/code> \u7684\u5c6c\u6027\u662f\u5426\u5408\u6cd5\u3002\u9078\u9805 D \u7684\u578b\u5225\u65b7\u8a00\u662f\u4e00\u7a2e\u9003\u751f\u53e3\uff0c\u4e0d\u5982\u5f9e\u6e90\u982d\u7528\u6cdb\u578b\u5b9a\u7fa9\u6b63\u78ba\u7684\u578b\u5225\u3002\"\n      };\n\n      function checkAnswerAdv(qNum, selected, correctAns) {\n        const question = document.getElementById(\"qAdv\" + qNum);\n        if (question.classList.contains(\"answered\")) return;\n\n        question.classList.add(\"answered\");\n        answeredAdv++;\n\n        const options = question.querySelectorAll(\".options-adv li\");\n        options.forEach((opt) => {\n          opt.classList.add(\"disabled\");\n          if (opt.textContent.startsWith(correctAns + \".\")) {\n            opt.classList.add(\"show-answer\");\n          }\n        });\n\n        const feedback = document.getElementById(\"fbAdv\" + qNum);\n        if (selected === correctAns) {\n          correctAdv++;\n          feedback.className = \"feedback-adv correct\";\n          feedback.innerHTML = \"\u2713 \u6b63\u78ba\uff01\" + explanationsAdv[qNum];\n        } else {\n          feedback.className = \"feedback-adv wrong\";\n          feedback.innerHTML =\n            \"\u2717 \u932f\u8aa4\u3002\u6b63\u78ba\u7b54\u6848\u662f \" + correctAns + \"\u3002\" + explanationsAdv[qNum];\n          options.forEach((opt) => {\n            if (opt.textContent.startsWith(selected + \".\")) {\n              opt.classList.add(\"wrong\");\n            }\n          });\n        }\n\n        if (answeredAdv === totalAdv) {\n          const scoreDiv = document.getElementById(\"scoreAdv\");\n          scoreDiv.style.display = \"block\";\n          let msg = \"\";\n          if (correctAdv === totalAdv) msg = \"\ud83c\udfaf \u5b8c\u7f8e\uff01\u4f60\u5df2\u7d93\u6e96\u5099\u597d\u5be6\u6230\u4e86\uff01\";\n          else if (correctAdv >= Math.ceil(totalAdv * 0.8))\n            msg = \"\ud83d\udcaa \u5f88\u68d2\uff01\u518d\u8907\u7fd2\u4e00\u4e0b\u932f\u7684\u984c\u76ee\";\n          else if (correctAdv >= Math.ceil(totalAdv * 0.6))\n            msg = \"\ud83d\udcd6 \u5efa\u8b70\u91cd\u8b80\u76f8\u95dc\u6bb5\u843d\u5f8c\u518d\u8a66\u4e00\u6b21\";\n          else msg = \"\ud83d\udd04 \u5efa\u8b70\u91cd\u65b0\u95b1\u8b80\u6587\u4ef6\uff0c\u7279\u5225\u6ce8\u610f\u64cd\u4f5c\u6d41\u7a0b\";\n          scoreDiv.innerHTML =\n            \"\u6e2c\u9a57\u5b8c\u6210\uff01\u5f97\u5206\uff1a\" + correctAdv + \" \/ \" + totalAdv + \"<br>\" + msg;\n        }\n      }\n    \n<\/script>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u6e2c\u9a57\uff1aTypeScript \u6cdb\u578b\u5165\u9580 \u5171 5 \u984c\uff0c\u9ede\u9078\u7b54\u6848\u5f8c\u6703\u7acb\u5373\u986f\u793a\u7d50\u679c 1. \u6cdb\u578b\uff08Generics\uff09\u6700\u6838 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rolpb_likes":0,"footnotes":""},"categories":[629],"tags":[26],"class_list":["post-702","post","type-post","status-publish","format-standard","hentry","category-typescript","tag-typescript"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"_links":{"self":[{"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/posts\/702","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/comments?post=702"}],"version-history":[{"count":1,"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/posts\/702\/revisions"}],"predecessor-version":[{"id":707,"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/posts\/702\/revisions\/707"}],"wp:attachment":[{"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/media?parent=702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/categories?post=702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.itsmygo.uk\/wordpress\/wp-json\/wp\/v2\/tags?post=702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}