{"id":276,"date":"2026-01-25T01:15:43","date_gmt":"2026-01-24T17:15:43","guid":{"rendered":"https:\/\/skwp.zeabur.app\/2026\/01\/25\/%e3%80%90vibe-coder-%e7%9a%84-react-%e6%95%99%e5%ad%b8%e3%80%9104-useeffect-%e8%88%87%e7%94%9f%e5%91%bd%e9%80%b1%e6%9c%9f%ef%bc%9a%e8%99%95%e7%90%86%e5%89%af%e4%bd%9c%e7%94%a8\/"},"modified":"2026-01-25T01:15:43","modified_gmt":"2026-01-24T17:15:43","slug":"%e3%80%90vibe-coder-%e7%9a%84-react-%e6%95%99%e5%ad%b8%e3%80%9104-useeffect-%e8%88%87%e7%94%9f%e5%91%bd%e9%80%b1%e6%9c%9f%ef%bc%9a%e8%99%95%e7%90%86%e5%89%af%e4%bd%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/blog.itsmygo.uk\/wordpress\/2026\/01\/25\/%e3%80%90vibe-coder-%e7%9a%84-react-%e6%95%99%e5%ad%b8%e3%80%9104-useeffect-%e8%88%87%e7%94%9f%e5%91%bd%e9%80%b1%e6%9c%9f%ef%bc%9a%e8%99%95%e7%90%86%e5%89%af%e4%bd%9c%e7%94%a8\/","title":{"rendered":"\u3010Vibe Coder \u7684 React \u6559\u5b78\u3011#04 useEffect \u8207\u751f\u547d\u9031\u671f\uff1a\u8655\u7406\u526f\u4f5c\u7528"},"content":{"rendered":"\n<div id=\"quiz-basic\">\n<style>\n#quiz-basic .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-basic .question h3 {\n        margin-top: 0;\n        color: #333;\n      }#quiz-basic .options {\n        list-style: none;\n        padding: 0;\n      }#quiz-basic .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-basic .options li:hover:not(.disabled) {\n        border-color: #4caf50;\n        background: #f0fff0;\n      }#quiz-basic .options li.correct {\n        border-color: #4caf50;\n        background: #e8f5e9;\n      }#quiz-basic .options li.wrong {\n        border-color: #f44336;\n        background: #ffebee;\n      }#quiz-basic .options li.disabled {\n        cursor: default;\n        opacity: 0.7;\n      }#quiz-basic .options li.show-answer {\n        border-color: #4caf50;\n        background: #e8f5e9;\n      }#quiz-basic .feedback {\n        margin-top: 15px;\n        padding: 12px;\n        border-radius: 6px;\n        display: none;\n      }#quiz-basic .feedback.correct {\n        background: #e8f5e9;\n        color: #2e7d32;\n        display: block;\n      }#quiz-basic .feedback.wrong {\n        background: #ffebee;\n        color: #c62828;\n        display: block;\n      }#quiz-basic .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-basic .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\uff1auseEffect \u8207\u751f\u547d\u9031\u671f\uff1a\u8655\u7406\u526f\u4f5c\u7528<\/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. \u5728 React \u4e2d\uff0c\u4ee5\u4e0b\u54ea\u4e00\u500b\u5c6c\u65bc\u300c\u526f\u4f5c\u7528\uff08Side Effect\uff09\u300d\uff1f<\/h3>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(1, 'A', 'C')\">A. \u56de\u50b3 JSX \u5143\u7d20<\/li>\n        <li onclick=\"checkAnswer(1, 'B', 'C')\">B. \u6839\u64da state \u6539\u8b8a\u986f\u793a\u7684\u6587\u5b57<\/li>\n        <li onclick=\"checkAnswer(1, 'C', 'C')\">C. \u547c\u53eb API \u6293\u53d6\u8cc7\u6599<\/li>\n        <li onclick=\"checkAnswer(1, 'D', 'C')\">D. \u5728 JSX \u4e2d\u986f\u793a\u6309\u9215<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb1\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q2\">\n      <h3>2. useEffect \u7684\u7b2c\u4e8c\u500b\u53c3\u6578\uff08\u4f9d\u8cf4\u9663\u5217\uff09\u8a2d\u70ba\u7a7a\u9663\u5217 <code>[]<\/code> \u6642\uff0cuseEffect \u6703\u5728\u4ec0\u9ebc\u6642\u5019\u57f7\u884c\uff1f<\/h3>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(2, 'A', 'B')\">A. \u6bcf\u6b21\u7d44\u4ef6\u91cd\u65b0\u6e32\u67d3\u5f8c\u90fd\u6703\u57f7\u884c<\/li>\n        <li onclick=\"checkAnswer(2, 'B', 'B')\">B. \u53ea\u5728\u7d44\u4ef6\u7b2c\u4e00\u6b21\u51fa\u73fe\u6642\u57f7\u884c\u4e00\u6b21<\/li>\n        <li onclick=\"checkAnswer(2, 'C', 'B')\">C. \u7d44\u4ef6\u6d88\u5931\u6642\u624d\u57f7\u884c<\/li>\n        <li onclick=\"checkAnswer(2, 'D', 'B')\">D. \u6c38\u9060\u4e0d\u6703\u57f7\u884c<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb2\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q3\">\n      <h3>3. \u8acb\u770b\u4ee5\u4e0b\u7a0b\u5f0f\u78bc\uff0c\u7576 <code>userId<\/code> \u5f9e 1 \u8b8a\u6210 2 \u6642\uff0cuseEffect \u6703\u91cd\u65b0\u57f7\u884c\u55ce\uff1f<\/h3>\n      <div class=\"code-block\">useEffect(() => {\n    fetch(`\/api\/users\/${userId}`);\n}, [userId]);<\/div>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(3, 'A', 'A')\">A. \u6703\uff0c\u56e0\u70ba userId \u5728\u4f9d\u8cf4\u9663\u5217\u4e2d<\/li>\n        <li onclick=\"checkAnswer(3, 'B', 'A')\">B. \u4e0d\u6703\uff0cuseEffect \u53ea\u57f7\u884c\u4e00\u6b21<\/li>\n        <li onclick=\"checkAnswer(3, 'C', 'A')\">C. \u6703\uff0c\u4f46\u5fc5\u9808\u624b\u52d5\u89f8\u767c<\/li>\n        <li onclick=\"checkAnswer(3, 'D', 'A')\">D. \u4e0d\u6703\uff0cfetch \u4e0d\u662f\u526f\u4f5c\u7528<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb3\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q4\">\n      <h3>4. \u5728 useEffect \u4e2d\u4f7f\u7528 setInterval \u8a2d\u5b9a\u8a08\u6642\u5668\u6642\uff0c\u70ba\u4ec0\u9ebc\u9700\u8981\u56de\u50b3\u6e05\u7406\u51fd\u6578\uff1f<\/h3>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(4, 'A', 'B')\">A. \u70ba\u4e86\u8b93\u8a08\u6642\u5668\u8dd1\u5f97\u66f4\u5feb<\/li>\n        <li onclick=\"checkAnswer(4, 'B', 'B')\">B. \u7d44\u4ef6\u6d88\u5931\u6642\u6e05\u9664\u8a08\u6642\u5668\uff0c\u907f\u514d\u8a18\u61b6\u9ad4\u6d29\u6f0f<\/li>\n        <li onclick=\"checkAnswer(4, 'C', 'B')\">C. React \u898f\u5b9a\u5fc5\u9808\u56de\u50b3\u51fd\u6578<\/li>\n        <li onclick=\"checkAnswer(4, 'D', 'B')\">D. \u70ba\u4e86\u8b93 useEffect \u80fd\u5920\u57f7\u884c<\/li>\n      <\/ul>\n      <div class=\"feedback\" id=\"fb4\"><\/div>\n    <\/div>\n\n    <div class=\"question\" id=\"q5\">\n      <h3>5. \u70ba\u4ec0\u9ebc useEffect \u4e0d\u80fd\u76f4\u63a5\u5ba3\u544a\u70ba async \u51fd\u5f0f\uff1f<\/h3>\n      <div class=\"code-block\">\/\/ \u9019\u662f\u932f\u8aa4\u7684\u5beb\u6cd5\uff1a\nuseEffect(async () => {\n    const data = await fetch(&#8216;\/api\/data&#8217;);\n}, []);<\/div>\n      <ul class=\"options\">\n        <li onclick=\"checkAnswer(5, 'A', 'C')\">A. async \u51fd\u5f0f\u57f7\u884c\u901f\u5ea6\u592a\u6162<\/li>\n        <li onclick=\"checkAnswer(5, 'B', 'C')\">B. React \u4e0d\u652f\u63f4 async\/await \u8a9e\u6cd5<\/li>\n        <li onclick=\"checkAnswer(5, 'C', 'C')\">C. useEffect \u7684\u56de\u50b3\u503c\u6709\u7279\u6b8a\u7528\u9014\uff08\u6e05\u7406\u51fd\u6578\uff09\uff0c\u4e0d\u80fd\u662f Promise<\/li>\n        <li onclick=\"checkAnswer(5, 'D', 'C')\">D. fetch \u4e0d\u80fd\u5728 useEffect \u4e2d\u4f7f\u7528<\/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: \"\u526f\u4f5c\u7528\u662f\u300c\u756b\u9762\u4ee5\u5916\u300d\u7684\u64cd\u4f5c\u3002\u547c\u53eb API\u3001\u8a2d\u5b9a\u8a08\u6642\u5668\u3001\u8a02\u95b1\u4e8b\u4ef6\u3001\u64cd\u4f5c DOM \u7b49\u90fd\u662f\u526f\u4f5c\u7528\u3002\u800c\u56de\u50b3 JSX\u3001\u986f\u793a\u6587\u5b57\u6309\u9215\u3001\u6839\u64da state \u6539\u8b8a\u756b\u9762\u90fd\u5c6c\u65bc\u300c\u6e32\u67d3\u300d\u7684\u4e3b\u8981\u4f5c\u7528\u3002\",\n        2: \"\u7a7a\u9663\u5217 <code>[]<\/code> \u8868\u793a\u300c\u53ea\u5728\u7d44\u4ef6\u7b2c\u4e00\u6b21\u51fa\u73fe\u6642\u57f7\u884c\uff0c\u4e4b\u5f8c\u4e0d\u7ba1\u300d\u3002\u9019\u5e38\u7528\u65bc\u6293\u53d6\u521d\u59cb\u8cc7\u6599\u6216\u8a2d\u5b9a\u8a02\u95b1\u3002\u5982\u679c\u6c92\u6709\u4f9d\u8cf4\u9663\u5217\uff0c\u5247\u6bcf\u6b21\u6e32\u67d3\u5f8c\u90fd\u6703\u57f7\u884c\u3002\",\n        3: \"\u7576\u4f9d\u8cf4\u9663\u5217\u4e2d\u7684\u8b8a\u6578\uff08\u5982 userId\uff09\u767c\u751f\u8b8a\u5316\u6642\uff0cuseEffect \u6703\u81ea\u52d5\u91cd\u65b0\u57f7\u884c\u3002\u9019\u662f useEffect \u76e3\u807d\u8b8a\u6578\u8b8a\u5316\u7684\u6838\u5fc3\u6a5f\u5236\u3002\",\n        4: \"\u7576\u7d44\u4ef6\u5f9e\u756b\u9762\u6d88\u5931\u6642\uff0c\u5982\u679c\u8a08\u6642\u5668\u9084\u5728\u57f7\u884c\uff0c\u6703\u9020\u6210\u8a18\u61b6\u9ad4\u6d29\u6f0f\u3002\u6e05\u7406\u51fd\u6578\uff08return \u88e1\u7684\u51fd\u5f0f\uff09\u6703\u5728\u7d44\u4ef6\u6d88\u5931\u524d\u57f7\u884c\uff0c\u7528\u4f86\u6e05\u9664\u8a08\u6642\u5668\u3001\u53d6\u6d88\u8a02\u95b1\u7b49\u6536\u5c3e\u5de5\u4f5c\u3002\",\n        5: \"useEffect \u7684\u56de\u50b3\u503c\u662f\u4fdd\u7559\u7d66\u300c\u6e05\u7406\u51fd\u6578\u300d\u4f7f\u7528\u7684\u3002async \u51fd\u5f0f\u6703\u56de\u50b3 Promise\uff0c\u9019\u6703\u5c0e\u81f4 React \u7121\u6cd5\u6b63\u78ba\u8655\u7406\u6e05\u7406\u908f\u8f2f\u3002\u6b63\u78ba\u505a\u6cd5\u662f\u5728 useEffect \u5167\u90e8\u5b9a\u7fa9 async \u51fd\u5f0f\u518d\u547c\u53eb\u5b83\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\">useEffect \u8b93\u4f60\u5728\u300c\u756b\u9762\u756b\u597d\u4e4b\u5f8c\u300d\u57f7\u884c\u984d\u5916\u64cd\u4f5c\uff0c\u50cf\u662f\u6293 API \u8cc7\u6599\u3001\u8a2d\u5b9a\u8a08\u6642\u5668\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u524d\u7f6e\u77e5\u8b58<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5df2\u8b80\u904e\u7b2c 3 \u7bc7\uff1a\u4e86\u89e3 Props \u8207 State<\/li>\n<li>\u77e5\u9053 useState \u600e\u9ebc\u7528<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ec0\u9ebc\u662f\u526f\u4f5c\u7528\uff08Side Effect\uff09\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 React \u88e1\uff0c\u300c\u6e32\u67d3\u300d\u662f\u6307\u628a JSX \u8b8a\u6210\u756b\u9762\u3002\u4f46\u6709\u4e9b\u64cd\u4f5c\u4e0d\u662f\u300c\u756b\u756b\u9762\u300d\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\u4e3b\u8981\u4f5c\u7528\uff08\u6e32\u67d3\uff09<\/th>\n<th>\u526f\u4f5c\u7528\uff08Side Effect\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u56de\u50b3 JSX<\/td>\n<td>\u547c\u53eb API \u6293\u8cc7\u6599<\/td>\n<\/tr>\n<tr>\n<td>\u986f\u793a\u6587\u5b57\u3001\u6309\u9215<\/td>\n<td>\u8a2d\u5b9a\u8a08\u6642\u5668<\/td>\n<\/tr>\n<tr>\n<td>\u6839\u64da state \u6539\u8b8a\u756b\u9762<\/td>\n<td>\u8a02\u95b1\u4e8b\u4ef6\uff08\u5982 WebSocket\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u64cd\u4f5c DOM\uff08\u5982\u8a2d\u5b9a title\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e00\u53e5\u8a71<\/strong>\uff1a\u526f\u4f5c\u7528\u662f\u300c\u756b\u9762\u4ee5\u5916\u300d\u7684\u64cd\u4f5c\u3002<\/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-1\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> { useState, useEffect } <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">'react'<\/span>;\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">Timer<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n    <span class=\"hljs-keyword\">const<\/span> &#91;seconds, setSeconds] = useState(<span class=\"hljs-number\">0<\/span>);\n\n    useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n        <span class=\"hljs-built_in\">document<\/span>.title = <span class=\"hljs-string\">`\u8a08\u6642\uff1a<span class=\"hljs-subst\">${seconds}<\/span> \u79d2`<\/span>;  <span class=\"hljs-comment\">\/\/ \u9019\u662f\u526f\u4f5c\u7528<\/span>\n    });\n\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">button<\/span> <span class=\"hljs-attr\">onClick<\/span>=<span class=\"hljs-string\">{()<\/span> =&gt;<\/span> setSeconds(seconds + 1)}&gt;\n        {seconds} \u79d2\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">button<\/span>&gt;<\/span><\/span>;\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\">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>\u9019\u6bb5\u4ee3\u78bc\u505a\u4e86\u4ec0\u9ebc<\/strong>\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6bcf\u6b21\u6309\u6309\u9215\uff0cseconds \u52a0 1<\/li>\n<li>\u6bcf\u6b21\u756b\u9762\u66f4\u65b0\u5f8c\uff0c\u81ea\u52d5\u66f4\u65b0\u7db2\u9801\u6a19\u984c<\/li>\n<li>useEffect \u88e1\u7684\u7a0b\u5f0f\u5728\u300c\u756b\u9762\u756b\u597d\u4e4b\u5f8c\u300d\u57f7\u884c<\/li>\n<\/ol>\n\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<\/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\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {          <span class=\"hljs-comment\">\/\/ \u300c\u7576\u756b\u9762\u66f4\u65b0\u5f8c\uff0c\u57f7\u884c\u9019\u500b\u51fd\u5f0f\u300d<\/span>\n    <span class=\"hljs-built_in\">document<\/span>.title = <span class=\"hljs-string\">`...`<\/span>; <span class=\"hljs-comment\">\/\/ \u57f7\u884c\u526f\u4f5c\u7528\uff08\u6539\u6a19\u984c\uff09<\/span>\n});                        <span class=\"hljs-comment\">\/\/ \u6c92\u6709\u7b2c\u4e8c\u500b\u53c3\u6578 = \u6bcf\u6b21\u66f4\u65b0\u90fd\u57f7\u884c<\/span>\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<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f9d\u8cf4\u9663\u5217\uff1a\u63a7\u5236\u4f55\u6642\u57f7\u884c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">useEffect \u7684\u7b2c\u4e8c\u500b\u53c3\u6578\u662f\u300c\u4f9d\u8cf4\u9663\u5217\u300d\uff0c\u6c7a\u5b9a\u4ec0\u9ebc\u6642\u5019\u91cd\u65b0\u57f7\u884c\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u60c5\u6cc1 1\uff1a\u6c92\u6709\u4f9d\u8cf4\u9663\u5217<\/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-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'\u6bcf\u6b21\u756b\u9762\u66f4\u65b0\u90fd\u6703\u57f7\u884c'<\/span>);\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>\u7ffb\u8b6f<\/strong>\uff1a\u300c\u6bcf\u6b21\u7d44\u4ef6\u91cd\u65b0\u6e32\u67d3\u5f8c\u90fd\u57f7\u884c\u300d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u60c5\u6cc1 2\uff1a\u7a7a\u9663\u5217 []<\/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-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'\u53ea\u5728\u7d44\u4ef6\u51fa\u73fe\u6642\u57f7\u884c\u4e00\u6b21'<\/span>);\n}, &#91;]);  <span class=\"hljs-comment\">\/\/ \u6ce8\u610f\u9019\u500b\u7a7a\u9663\u5217<\/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\"><strong>\u7ffb\u8b6f<\/strong>\uff1a\u300c\u53ea\u5728\u7d44\u4ef6\u7b2c\u4e00\u6b21\u51fa\u73fe\u6642\u57f7\u884c\uff0c\u4e4b\u5f8c\u4e0d\u7ba1\u300d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u60c5\u6cc1 3\uff1a\u6709\u4f9d\u8cf4<\/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-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">`userId \u8b8a\u4e86\uff1a<span class=\"hljs-subst\">${userId}<\/span>`<\/span>);\n}, &#91;userId]);  <span class=\"hljs-comment\">\/\/ \u76e3\u807d userId<\/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<p class=\"wp-block-paragraph\"><strong>\u7ffb\u8b6f<\/strong>\uff1a\u300c\u7576 userId \u8b8a\u5316\u6642\u624d\u57f7\u884c\u300d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5c0d\u7167\u8868<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\u4f9d\u8cf4\u9663\u5217<\/th>\n<th>\u57f7\u884c\u6642\u6a5f<\/th>\n<th>\u5e38\u898b\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u6c92\u6709<\/td>\n<td>\u6bcf\u6b21\u6e32\u67d3\u5f8c<\/td>\n<td>\u5c11\u7528\uff0c\u5bb9\u6613\u51fa\u554f\u984c<\/td>\n<\/tr>\n<tr>\n<td><code>[]<\/code><\/td>\n<td>\u53ea\u6709\u7b2c\u4e00\u6b21<\/td>\n<td>\u6293\u521d\u59cb\u8cc7\u6599\u3001\u8a2d\u5b9a\u8a02\u95b1<\/td>\n<\/tr>\n<tr>\n<td><code>[a, b]<\/code><\/td>\n<td>a \u6216 b \u8b8a\u5316\u6642<\/td>\n<td>\u6839\u64da\u53c3\u6578\u8b8a\u5316\u6293\u8cc7\u6599<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5be6\u4f5c\uff1a\u5f9e API \u6293\u53d6\u8cc7\u6599<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9019\u662f AI \u6700\u5e38\u5e6b\u4f60\u5beb\u7684 useEffect \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-6\" 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\">UserProfile<\/span>(<span class=\"hljs-params\">{ userId }<\/span>) <\/span>{\n    <span class=\"hljs-keyword\">const<\/span> &#91;user, setUser] = useState(<span class=\"hljs-literal\">null<\/span>);\n    <span class=\"hljs-keyword\">const<\/span> &#91;loading, setLoading] = useState(<span class=\"hljs-literal\">true<\/span>);\n\n    useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n        <span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">fetchUser<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n            setLoading(<span class=\"hljs-literal\">true<\/span>);\n            <span class=\"hljs-keyword\">const<\/span> response = <span class=\"hljs-keyword\">await<\/span> fetch(<span class=\"hljs-string\">`\/api\/users\/<span class=\"hljs-subst\">${userId}<\/span>`<\/span>);\n            <span class=\"hljs-keyword\">const<\/span> data = <span class=\"hljs-keyword\">await<\/span> response.json();\n            setUser(data);\n            setLoading(<span class=\"hljs-literal\">false<\/span>);\n        }\n        fetchUser();\n    }, &#91;userId]);  <span class=\"hljs-comment\">\/\/ userId \u8b8a\u5316\u6642\u91cd\u65b0\u6293<\/span>\n\n    <span class=\"hljs-keyword\">if<\/span> (loading) <span class=\"hljs-keyword\">return<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span>&gt;<\/span>\u8f09\u5165\u4e2d...<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span><\/span>;\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"xml\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span>&gt;<\/span>{user.name}<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span><\/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\">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>\u9010\u6b65\u89e3\u8b80<\/strong>\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\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {                    <span class=\"hljs-comment\">\/\/ \u756b\u9762\u66f4\u65b0\u5f8c\u57f7\u884c<\/span>\n    <span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">fetchUser<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{      <span class=\"hljs-comment\">\/\/ \u5728\u88e1\u9762\u5b9a\u7fa9 async \u51fd\u5f0f<\/span>\n        setLoading(<span class=\"hljs-literal\">true<\/span>);             <span class=\"hljs-comment\">\/\/ \u958b\u59cb\u8f09\u5165<\/span>\n        <span class=\"hljs-keyword\">const<\/span> response = <span class=\"hljs-keyword\">await<\/span> fetch(...);  <span class=\"hljs-comment\">\/\/ \u547c\u53eb API<\/span>\n        <span class=\"hljs-keyword\">const<\/span> data = <span class=\"hljs-keyword\">await<\/span> response.json(); <span class=\"hljs-comment\">\/\/ \u89e3\u6790\u56de\u61c9<\/span>\n        setUser(data);                <span class=\"hljs-comment\">\/\/ \u66f4\u65b0\u72c0\u614b<\/span>\n        setLoading(<span class=\"hljs-literal\">false<\/span>);            <span class=\"hljs-comment\">\/\/ \u8f09\u5165\u5b8c\u6210<\/span>\n    }\n    fetchUser();                      <span class=\"hljs-comment\">\/\/ \u57f7\u884c\u9019\u500b\u51fd\u5f0f<\/span>\n}, &#91;userId]);                        <span class=\"hljs-comment\">\/\/ \u7576 userId \u8b8a\u5316\u6642\u91cd\u65b0\u57f7\u884c<\/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>\u70ba\u4ec0\u9ebc\u8981\u5728 useEffect \u88e1\u9762\u5b9a\u7fa9\u51fd\u5f0f\uff1f<\/strong> \u56e0\u70ba useEffect \u7684\u56de\u50b3\u503c\u6709\u7279\u6b8a\u7528\u9014\uff08\u6e05\u7406\u51fd\u6578\uff09\uff0c\u4e0d\u80fd\u76f4\u63a5\u662f Promise\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6e05\u7406\u51fd\u6578\uff08Cleanup\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u4e9b\u526f\u4f5c\u7528\u9700\u8981\u300c\u6536\u5c3e\u300d\uff0c\u5426\u5247\u6703\u9020\u6210\u8a18\u61b6\u9ad4\u6d29\u6f0f\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=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-comment\">\/\/ \u8a2d\u5b9a\u8a08\u6642\u5668<\/span>\n    <span class=\"hljs-keyword\">const<\/span> timer = setInterval(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'tick'<\/span>);\n    }, <span class=\"hljs-number\">1000<\/span>);\n\n    <span class=\"hljs-comment\">\/\/ \u56de\u50b3\u6e05\u7406\u51fd\u6578<\/span>\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n        clearInterval(timer);  <span class=\"hljs-comment\">\/\/ \u7d44\u4ef6\u6d88\u5931\u6642\u6e05\u9664\u8a08\u6642\u5668<\/span>\n    };\n}, &#91;]);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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<\/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=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-comment\">\/\/ \u300c\u7d44\u4ef6\u51fa\u73fe\u6642\u300d\u505a\u9019\u4e9b\u4e8b<\/span>\n    <span class=\"hljs-keyword\">const<\/span> timer = setInterval(...);\n\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n        <span class=\"hljs-comment\">\/\/ \u300c\u7d44\u4ef6\u6d88\u5931\u524d\u300d\u505a\u9019\u4e9b\u4e8b\uff08\u6e05\u7406\uff09<\/span>\n    };\n}, &#91;]);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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\">\u4ec0\u9ebc\u6642\u5019\u9700\u8981\u6e05\u7406\uff1f<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\u9700\u8981\u6e05\u7406<\/th>\n<th>\u4e0d\u9700\u8981\u6e05\u7406<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>setInterval \/ setTimeout<\/td>\n<td>\u547c\u53eb API\uff08fetch\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u8a02\u95b1 WebSocket<\/td>\n<td>\u4fee\u6539 document.title<\/td>\n<\/tr>\n<tr>\n<td>\u6dfb\u52a0 event listener<\/td>\n<td>console.log<\/td>\n<\/tr>\n<tr>\n<td>\u7b2c\u4e09\u65b9\u51fd\u5f0f\u5eab\u521d\u59cb\u5316<\/td>\n<td>\u66f4\u65b0 state<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u898b\u932f\u8aa4\u8207\u89e3\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u932f\u8aa4 1\uff1a\u7121\u9650\u8ff4\u5708<\/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=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-comment\">\/\/ \u932f\u8aa4\uff1a\u6703\u7121\u9650\u57f7\u884c<\/span>\nuseEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    setCount(count + <span class=\"hljs-number\">1<\/span>);  <span class=\"hljs-comment\">\/\/ \u6539 state \u2192 \u91cd\u65b0\u6e32\u67d3 \u2192 \u53c8\u57f7\u884c useEffect<\/span>\n});\n\n<span class=\"hljs-comment\">\/\/ \u6b63\u78ba\uff1a\u52a0\u4e0a\u7a7a\u9663\u5217<\/span>\nuseEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    setCount(count + <span class=\"hljs-number\">1<\/span>);\n}, &#91;]);  <span class=\"hljs-comment\">\/\/ \u53ea\u57f7\u884c\u4e00\u6b21<\/span>\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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\">\u932f\u8aa4 2\uff1a\u5fd8\u8a18\u52a0\u4f9d\u8cf4<\/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-11\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-comment\">\/\/ \u932f\u8aa4\uff1auserId \u8b8a\u4e86\u4f46\u4e0d\u6703\u91cd\u65b0\u6293\u8cc7\u6599<\/span>\nuseEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    fetch(<span class=\"hljs-string\">`\/api\/users\/<span class=\"hljs-subst\">${userId}<\/span>`<\/span>);\n}, &#91;]);  <span class=\"hljs-comment\">\/\/ \u7a7a\u9663\u5217\u53ea\u57f7\u884c\u4e00\u6b21<\/span>\n\n<span class=\"hljs-comment\">\/\/ \u6b63\u78ba\uff1a\u52a0\u4e0a userId<\/span>\nuseEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    fetch(<span class=\"hljs-string\">`\/api\/users\/<span class=\"hljs-subst\">${userId}<\/span>`<\/span>);\n}, &#91;userId]);  <span class=\"hljs-comment\">\/\/ userId \u8b8a\u5316\u6642\u91cd\u65b0\u57f7\u884c<\/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\">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\">\u932f\u8aa4 3\uff1a\u76f4\u63a5\u7528 async<\/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-12\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-comment\">\/\/ \u932f\u8aa4\uff1auseEffect \u4e0d\u80fd\u76f4\u63a5\u662f async \u51fd\u5f0f<\/span>\nuseEffect(<span class=\"hljs-keyword\">async<\/span> () =&gt; {\n    <span class=\"hljs-keyword\">const<\/span> data = <span class=\"hljs-keyword\">await<\/span> fetch(...);\n}, &#91;]);\n\n<span class=\"hljs-comment\">\/\/ \u6b63\u78ba\uff1a\u5728\u88e1\u9762\u5b9a\u7fa9 async \u51fd\u5f0f<\/span>\nuseEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">fetchData<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n        <span class=\"hljs-keyword\">const<\/span> data = <span class=\"hljs-keyword\">await<\/span> fetch(...);\n    }\n    fetchData();\n}, &#91;]);\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\">AI \u5e38\u7528\u7684 useEffect \u6a21\u5f0f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6a21\u5f0f 1\uff1a\u8f09\u5165\u521d\u59cb\u8cc7\u6599<\/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-13\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    fetch(<span class=\"hljs-string\">'\/api\/data'<\/span>)\n        .then(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res.json())\n        .then(<span class=\"hljs-function\"><span class=\"hljs-params\">data<\/span> =&gt;<\/span> setData(data));\n}, &#91;]);\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<h3 class=\"wp-block-heading\">\u6a21\u5f0f 2\uff1a\u76e3\u807d\u53c3\u6578\u8b8a\u5316<\/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-14\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-keyword\">if<\/span> (searchTerm) {\n        fetch(<span class=\"hljs-string\">`\/api\/search?q=<span class=\"hljs-subst\">${searchTerm}<\/span>`<\/span>)\n            .then(<span class=\"hljs-function\"><span class=\"hljs-params\">res<\/span> =&gt;<\/span> res.json())\n            .then(setResults);\n    }\n}, &#91;searchTerm]);\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\">\u6a21\u5f0f 3\uff1a\u8a02\u95b1\u8207\u53d6\u6d88\u8a02\u95b1<\/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=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">useEffect(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\n    <span class=\"hljs-keyword\">const<\/span> subscription = eventSource.subscribe(handleEvent);\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> subscription.unsubscribe();\n}, &#91;]);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><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\">Vibe Coder \u6aa2\u67e5\u9ede<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u5230 useEffect \u6642\u78ba\u8a8d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>[ ] \u6709\u4f9d\u8cf4\u9663\u5217\u55ce\uff1f\u6c92\u6709\u53ef\u80fd\u6703\u7121\u9650\u57f7\u884c<\/li>\n<li>[ ] \u4f9d\u8cf4\u9663\u5217\u6709\u6f0f\u6389\u7684\u8b8a\u6578\u55ce\uff1f<\/li>\n<li>[ ] \u9700\u8981\u6e05\u7406\u55ce\uff1f\uff08\u8a08\u6642\u5668\u3001\u8a02\u95b1\u3001\u4e8b\u4ef6\u76e3\u807d\uff09<\/li>\n<li>[ ] \u6709\u8655\u7406 loading \u72c0\u614b\u55ce\uff1f<\/li>\n<li>[ ] \u6709\u8655\u7406\u932f\u8aa4\u55ce\uff1f<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Vibe Coding \u6280\u5de7\uff1a\u8acb AI \u5e6b\u5fd9\u9664\u932f useEffect<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7576 useEffect \u51fa\u554f\u984c\u6642\uff0c\u53ef\u4ee5\u9019\u6a23\u554f AI\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7121\u9650\u8ff4\u5708\u6642<\/strong>\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-16\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\">\u6211\u7684 <span class=\"hljs-selector-tag\">useEffect<\/span> \u4e00\u76f4\u91cd\u8907\u57f7\u884c\uff0c\u9019\u662f\u6211\u7684\u4ee3\u78bc\uff1a\n<span class=\"hljs-selector-attr\">&#91;\u8cbc\u4e0a\u4ee3\u78bc]<\/span>\n\u8acb\u5e6b\u6211\u6aa2\u67e5\u4f9d\u8cf4\u9663\u5217\u6709\u6c92\u6709\u554f\u984c\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8cc7\u6599\u6c92\u66f4\u65b0\u6642<\/strong>\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-17\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">userId<\/span> \u8b8a\u4e86\u4f46\u756b\u9762\u6c92\u66f4\u65b0\uff0c\u9019\u662f\u6211\u7684 <span class=\"hljs-selector-tag\">useEffect<\/span>\uff1a\n<span class=\"hljs-selector-attr\">&#91;\u8cbc\u4e0a\u4ee3\u78bc]<\/span>\n\u662f\u4e0d\u662f\u4f9d\u8cf4\u9663\u5217\u7684\u554f\u984c\uff1f\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8a18\u61b6\u9ad4\u6d29\u6f0f\u8b66\u544a\u6642<\/strong>\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\">React \u8aaa <span class=\"hljs-string\">\"Can't perform a state update on an unmounted component\"<\/span>\n\u9019\u662f\u6211\u7684\u4ee3\u78bc\uff1a\n&#91;\u8cbc\u4e0a\u4ee3\u78bc]\n\u9700\u8981\u52a0\u6e05\u7406\u51fd\u6578\u55ce\uff1f\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<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u91cd\u9ede\u6574\u7406<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>\u6982\u5ff5<\/th>\n<th>\u4e00\u53e5\u8a71<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u526f\u4f5c\u7528<\/td>\n<td>\u6e32\u67d3\u4ee5\u5916\u7684\u64cd\u4f5c\uff08API\u3001\u8a08\u6642\u5668\u3001DOM\uff09<\/td>\n<\/tr>\n<tr>\n<td>useEffect<\/td>\n<td>\u5728\u300c\u756b\u9762\u756b\u597d\u5f8c\u300d\u57f7\u884c\u526f\u4f5c\u7528<\/td>\n<\/tr>\n<tr>\n<td>\u4f9d\u8cf4\u9663\u5217<\/td>\n<td>\u63a7\u5236\u4f55\u6642\u91cd\u65b0\u57f7\u884c<\/td>\n<\/tr>\n<tr>\n<td>\u7a7a\u9663\u5217 []<\/td>\n<td>\u53ea\u57f7\u884c\u4e00\u6b21<\/td>\n<\/tr>\n<tr>\n<td>\u6e05\u7406\u51fd\u6578<\/td>\n<td>\u7d44\u4ef6\u6d88\u5931\u524d\u7684\u6536\u5c3e\u5de5\u4f5c<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0b\u4e00\u7bc7\u9810\u544a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u4e00\u7bc7\u6211\u5011\u6703\u5b78\u7fd2\u300c\u689d\u4ef6\u6e32\u67d3\u8207\u5217\u8868\u300d\uff0c\u770b AI \u600e\u9ebc\u7528 map \u548c\u4e09\u5143\u904b\u7b97\u5b50\u7522\u751f\u52d5\u614b\u756b\u9762\u3002<\/p>\n\n\n\n<div id=\"quiz-advanced\">\n<style>\n#quiz-advanced .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-advanced .badge.scenario {\n        background: #ebf8ff;\n        color: #2b6cb0;\n      }#quiz-advanced .badge.debug {\n        background: #fef3c7;\n        color: #92400e;\n      }#quiz-advanced .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-advanced .question-adv h3 {\n        margin-top: 0;\n        color: #2d3748;\n      }#quiz-advanced .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-advanced .options-adv {\n        list-style: none;\n        padding: 0;\n      }#quiz-advanced .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-advanced .options-adv li:hover:not(.disabled) {\n        border-color: #ed8936;\n        background: #fffaf0;\n      }#quiz-advanced .options-adv li.disabled {\n        cursor: default;\n        opacity: 0.7;\n      }#quiz-advanced .options-adv li.show-answer {\n        border-color: #48bb78;\n        background: #f0fff4;\n      }#quiz-advanced .options-adv li.wrong {\n        border-color: #fc8181;\n        background: #fff5f5;\n      }#quiz-advanced .feedback-adv {\n        margin-top: 16px;\n        padding: 14px;\n        border-radius: 8px;\n        display: none;\n        line-height: 1.6;\n      }#quiz-advanced .feedback-adv.correct {\n        background: #f0fff4;\n        color: #276749;\n        display: block;\n      }#quiz-advanced .feedback-adv.wrong {\n        background: #fff5f5;\n        color: #c53030;\n        display: block;\n      }#quiz-advanced .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-advanced .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\uff1auseEffect \u8207\u751f\u547d\u9031\u671f\uff1a\u8655\u7406\u526f\u4f5c\u7528<\/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\u4f7f\u7528\u8005\u500b\u4eba\u9801\u9762\uff0c\u9700\u8981\u5728\u7d44\u4ef6\u8f09\u5165\u6642\u5f9e API \u6293\u53d6\u4f7f\u7528\u8005\u8cc7\u6599\uff0c\u800c\u4e14\u7576 URL \u4e2d\u7684 userId \u53c3\u6578\u6539\u8b8a\u6642\u8981\u91cd\u65b0\u6293\u53d6\u3002\u4ee5\u4e0b\u54ea\u500b useEffect \u5beb\u6cd5\u6700\u6b63\u78ba\uff1f <span class=\"badge scenario\">\u60c5\u5883\u984c<\/span><\/h3>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(1, 'A', 'C')\">A. <code>useEffect(() => { fetchUser(userId); });<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(1, 'B', 'C')\">B. <code>useEffect(() => { fetchUser(userId); }, []);<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(1, 'C', 'C')\">C. <code>useEffect(() => { fetchUser(userId); }, [userId]);<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(1, 'D', 'C')\">D. <code>useEffect(async () => { await fetchUser(userId); }, [userId]);<\/code><\/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\u5be6\u4f5c\u4e00\u500b\u5373\u6642\u901a\u77e5\u529f\u80fd\uff0c\u4f7f\u7528 WebSocket \u8a02\u95b1\u4f3a\u670d\u5668\u7684\u8a0a\u606f\u3002\u7d44\u4ef6\u6d88\u5931\u6642\u61c9\u8a72\u53d6\u6d88\u8a02\u95b1\u3002\u4ee5\u4e0b\u54ea\u500b\u5be6\u4f5c\u65b9\u5f0f\u6700\u4f73\uff1f <span class=\"badge scenario\">\u60c5\u5883\u984c<\/span><\/h3>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(2, 'A', 'B')\">A. \u5728 useEffect \u5916\u9762\u8a02\u95b1\uff0c\u4e0d\u9700\u8981\u53d6\u6d88<\/li>\n        <li onclick=\"checkAnswerAdv(2, 'B', 'B')\">B. \u5728 useEffect \u4e2d\u8a02\u95b1\uff0c\u4e26\u5728 return \u7684\u6e05\u7406\u51fd\u6578\u4e2d\u53d6\u6d88\u8a02\u95b1<\/li>\n        <li onclick=\"checkAnswerAdv(2, 'C', 'B')\">C. \u5728 useEffect \u4e2d\u8a02\u95b1\uff0c\u4f7f\u7528\u53e6\u4e00\u500b useEffect \u53d6\u6d88\u8a02\u95b1<\/li>\n        <li onclick=\"checkAnswerAdv(2, 'D', 'B')\">D. \u76f4\u63a5\u5728\u7d44\u4ef6\u51fd\u5f0f\u4e2d\u8a02\u95b1\uff0c\u4e0d\u4f7f\u7528 useEffect<\/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\u7684\u641c\u5c0b\u529f\u80fd\u9700\u8981\u5728\u4f7f\u7528\u8005\u8f38\u5165\u641c\u5c0b\u95dc\u9375\u5b57\u5f8c\u81ea\u52d5\u67e5\u8a62 API\u3002\u4f46\u4f60\u767c\u73fe\u6bcf\u6253\u4e00\u500b\u5b57\u5c31\u6703\u767c\u9001\u4e00\u6b21\u8acb\u6c42\uff0c\u9020\u6210\u6548\u80fd\u554f\u984c\u3002\u8981\u5982\u4f55\u5728 useEffect \u4e2d\u53ea\u5c0d\u300c\u6709\u5167\u5bb9\u7684\u641c\u5c0b\u8a5e\u300d\u767c\u9001\u8acb\u6c42\uff1f <span class=\"badge scenario\">\u60c5\u5883\u984c<\/span><\/h3>\n      <div class=\"code-block\">useEffect(() => {\n    \/\/ \u8a72\u600e\u9ebc\u5beb\uff1f\n}, [searchTerm]);<\/div>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(3, 'A', 'A')\">A. \u5728 useEffect \u5167\u52a0\u4e0a <code>if (searchTerm)<\/code> \u689d\u4ef6\u5224\u65b7\u5f8c\u518d\u767c\u9001\u8acb\u6c42<\/li>\n        <li onclick=\"checkAnswerAdv(3, 'B', 'A')\">B. \u79fb\u9664\u4f9d\u8cf4\u9663\u5217\u4e2d\u7684 searchTerm<\/li>\n        <li onclick=\"checkAnswerAdv(3, 'C', 'A')\">C. \u628a\u4f9d\u8cf4\u9663\u5217\u6539\u6210\u7a7a\u9663\u5217 <code>[]<\/code><\/li>\n        <li onclick=\"checkAnswerAdv(3, 'D', 'A')\">D. \u4e0d\u4f7f\u7528 useEffect\uff0c\u6539\u7528 onClick \u4e8b\u4ef6<\/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. \u5c0f\u7f8e\u5beb\u4e86\u4ee5\u4e0b\u7a0b\u5f0f\u78bc\uff0c\u4f46\u767c\u73fe\u700f\u89bd\u5668\u8b8a\u5f97\u5f88\u6162\uff0cConsole \u4e00\u76f4\u5370\u51fa\u8a0a\u606f\u3002\u554f\u984c\u51fa\u5728\u54ea\u88e1\uff1f <span class=\"badge debug\">\u932f\u8aa4\u8a3a\u65b7<\/span><\/h3>\n      <div class=\"code-block\">function Counter() {\n    const [count, setCount] = useState(0);\n\n    useEffect(() => {\n        setCount(count + 1);\n        console.log(&#8216;count changed&#8217;);\n    });\n\n    return &lt;div&gt;{count}&lt;\/div&gt;;\n}<\/div>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(4, 'A', 'B')\">A. useState \u7684\u521d\u59cb\u503c\u61c9\u8a72\u662f\u5b57\u4e32<\/li>\n        <li onclick=\"checkAnswerAdv(4, 'B', 'B')\">B. useEffect \u6c92\u6709\u4f9d\u8cf4\u9663\u5217\uff0c\u6bcf\u6b21\u6e32\u67d3\u90fd\u6703\u57f7\u884c setCount\uff0c\u9020\u6210\u7121\u9650\u8ff4\u5708<\/li>\n        <li onclick=\"checkAnswerAdv(4, 'C', 'B')\">C. console.log \u6703\u963b\u585e\u6e32\u67d3<\/li>\n        <li onclick=\"checkAnswerAdv(4, 'D', 'B')\">D. setCount \u61c9\u8a72\u653e\u5728 return \u4e4b\u5f8c<\/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. \u5c0f\u660e\u6536\u5230 React \u8b66\u544a\uff1a\u300cCan&#8217;t perform a state update on an unmounted component\u300d\u3002\u4ed6\u7684\u7a0b\u5f0f\u78bc\u5982\u4e0b\uff0c\u554f\u984c\u6700\u53ef\u80fd\u662f\u4ec0\u9ebc\uff1f <span class=\"badge debug\">\u932f\u8aa4\u8a3a\u65b7<\/span><\/h3>\n      <div class=\"code-block\">function UserProfile({ userId }) {\n    const [user, setUser] = useState(null);\n\n    useEffect(() => {\n        fetch(`\/api\/users\/${userId}`)\n            .then(res => res.json())\n            .then(data => setUser(data));\n    }, [userId]);\n\n    return &lt;div&gt;{user?.name}&lt;\/div&gt;;\n}<\/div>\n      <ul class=\"options-adv\">\n        <li onclick=\"checkAnswerAdv(5, 'A', 'C')\">A. fetch \u8a9e\u6cd5\u6709\u932f\u8aa4<\/li>\n        <li onclick=\"checkAnswerAdv(5, 'B', 'C')\">B. userId \u6c92\u6709\u653e\u5728\u4f9d\u8cf4\u9663\u5217\u4e2d<\/li>\n        <li onclick=\"checkAnswerAdv(5, 'C', 'C')\">C. API \u56de\u61c9\u9084\u6c92\u56de\u4f86\u6642\u7d44\u4ef6\u5c31\u6d88\u5931\u4e86\uff0c\u4f46 setUser \u4ecd\u7136\u88ab\u547c\u53eb<\/li>\n        <li onclick=\"checkAnswerAdv(5, 'D', 'C')\">D. useState \u7684\u521d\u59cb\u503c\u4e0d\u80fd\u662f null<\/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: \"\u9078\u9805 C \u662f\u6b63\u78ba\u7684\u3002\u628a <code>userId<\/code> \u653e\u5728\u4f9d\u8cf4\u9663\u5217\u4e2d\uff0c\u78ba\u4fdd\u521d\u6b21\u8f09\u5165\u6642\u6293\u53d6\u8cc7\u6599\uff0c\u4e14\u7576 userId \u8b8a\u5316\u6642\u6703\u91cd\u65b0\u6293\u53d6\u3002\u9078\u9805 A \u6c92\u6709\u4f9d\u8cf4\u9663\u5217\u6703\u5c0e\u81f4\u6bcf\u6b21\u6e32\u67d3\u90fd\u57f7\u884c\uff1b\u9078\u9805 B \u7684\u7a7a\u9663\u5217\u53ea\u6703\u57f7\u884c\u4e00\u6b21\uff0cuserId \u6539\u8b8a\u4e0d\u6703\u91cd\u65b0\u6293\u53d6\uff1b\u9078\u9805 D \u76f4\u63a5\u7528 async \u51fd\u5f0f\u662f\u932f\u8aa4\u7684\u8a9e\u6cd5\u3002\",\n        2: \"\u9078\u9805 B \u662f\u6700\u4f73\u5be6\u4f5c\u3002\u5728\u540c\u4e00\u500b useEffect \u4e2d\u8a02\u95b1\u4e26\u5728 return \u7684\u6e05\u7406\u51fd\u6578\u4e2d\u53d6\u6d88\u8a02\u95b1\uff0c\u9019\u662f React \u5b98\u65b9\u63a8\u85a6\u7684\u6a21\u5f0f\u3002\u6e05\u7406\u51fd\u6578\u6703\u5728\u7d44\u4ef6\u6d88\u5931\u524d\u57f7\u884c\uff0c\u78ba\u4fdd\u4e0d\u6703\u6709\u8a18\u61b6\u9ad4\u6d29\u6f0f\u3002\u5176\u4ed6\u9078\u9805\u8981\u9ebc\u4e0d\u6703\u6e05\u7406\u8a02\u95b1\uff0c\u8981\u9ebc\u6703\u5728\u6bcf\u6b21\u6e32\u67d3\u6642\u90fd\u57f7\u884c\u8a02\u95b1\u908f\u8f2f\u3002\",\n        3: \"\u9078\u9805 A \u662f\u6b63\u78ba\u7684\u505a\u6cd5\u3002\u5728 useEffect \u5167\u90e8\u52a0\u4e0a\u689d\u4ef6\u5224\u65b7 <code>if (searchTerm)<\/code>\uff0c\u53ea\u6709\u7576\u641c\u5c0b\u8a5e\u6709\u5167\u5bb9\u6642\u624d\u767c\u9001\u8acb\u6c42\u3002\u9019\u662f\u6587\u7ae0\u4e2d\u300c\u6a21\u5f0f 2\uff1a\u76e3\u807d\u53c3\u6578\u8b8a\u5316\u300d\u7684\u7bc4\u4f8b\u505a\u6cd5\u3002\u79fb\u9664\u4f9d\u8cf4\u6216\u6539\u6210\u7a7a\u9663\u5217\u6703\u8b93\u529f\u80fd\u5931\u6548\uff0c\u4e0d\u4f7f\u7528 useEffect \u5247\u7121\u6cd5\u5be6\u73fe\u300c\u8f38\u5165\u5f8c\u81ea\u52d5\u67e5\u8a62\u300d\u7684\u6548\u679c\u3002\",\n        4: \"\u9019\u662f\u7d93\u5178\u7684\u7121\u9650\u8ff4\u5708\u554f\u984c\u3002useEffect \u6c92\u6709\u4f9d\u8cf4\u9663\u5217\uff0c\u4ee3\u8868\u6bcf\u6b21\u6e32\u67d3\u5f8c\u90fd\u6703\u57f7\u884c\u3002\u57f7\u884c\u6642\u547c\u53eb <code>setCount<\/code> \u6703\u66f4\u65b0 state\uff0c\u66f4\u65b0 state \u6703\u89f8\u767c\u91cd\u65b0\u6e32\u67d3\uff0c\u91cd\u65b0\u6e32\u67d3\u5f8c\u53c8\u6703\u57f7\u884c useEffect...\u5f62\u6210\u7121\u9650\u8ff4\u5708\u3002\u89e3\u6cd5\u662f\u52a0\u4e0a\u7a7a\u9663\u5217 <code>[]<\/code> \u8b93\u5b83\u53ea\u57f7\u884c\u4e00\u6b21\u3002\",\n        5: \"\u9019\u662f\u7d44\u4ef6\u88ab\u5378\u8f09\u5f8c\u4ecd\u5617\u8a66\u66f4\u65b0 state \u7684\u554f\u984c\u3002\u7576 userId \u8b8a\u5316\u6216\u4f7f\u7528\u8005\u5feb\u901f\u5207\u63db\u9801\u9762\u6642\uff0c\u7d44\u4ef6\u53ef\u80fd\u5728 API \u56de\u61c9\u4e4b\u524d\u5c31\u6d88\u5931\u4e86\u3002\u4f46 fetch \u7684 Promise \u5b8c\u6210\u5f8c\u4ecd\u6703\u547c\u53eb <code>setUser<\/code>\uff0cReact \u5c31\u6703\u8b66\u544a\u4f60\u6b63\u5728\u66f4\u65b0\u4e00\u500b\u5df2\u7d93\u4e0d\u5b58\u5728\u7684\u7d44\u4ef6\u3002\u89e3\u6c7a\u65b9\u6cd5\u662f\u5728 useEffect \u4e2d\u52a0\u5165\u6e05\u7406\u908f\u8f2f\uff0c\u4f7f\u7528\u4e00\u500b flag \u4f86\u8ffd\u8e64\u7d44\u4ef6\u662f\u5426\u9084\u5b58\u5728\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\uff1auseEffect \u8207\u751f\u547d\u9031\u671f\uff1a\u8655\u7406\u526f\u4f5c\u7528 \u5171 5 \u984c\uff0c\u9ede\u9078\u7b54\u6848\u5f8c\u6703\u7acb\u5373\u986f\u793a\u7d50\u679c 1. \u5728 React  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