{"id":37985,"date":"2023-04-07T22:43:06","date_gmt":"2023-01-23T20:56:00","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e5%af%b9%e4%ba%8ereact%e5%88%9d%e5%ad%a6%e8%80%85%ef%bc%8c%e6%88%91%e6%80%bb%e7%bb%93%e4%ba%86%e5%85%b3%e4%ba%8eusestate%e5%92%8cuseeffect%e7%9a%84%e5%86%85%e5%ae%b9%e3%80%82\/"},"modified":"2024-04-29T22:26:07","modified_gmt":"2024-04-29T14:26:07","slug":"%e3%80%90react%e3%80%91%e5%af%b9%e4%ba%8ereact%e5%88%9d%e5%ad%a6%e8%80%85%ef%bc%8c%e6%88%91%e6%80%bb%e7%bb%93%e4%ba%86%e5%85%b3%e4%ba%8eusestate%e5%92%8cuseeffect%e7%9a%84%e5%86%85%e5%ae%b9%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e5%af%b9%e4%ba%8ereact%e5%88%9d%e5%ad%a6%e8%80%85%ef%bc%8c%e6%88%91%e6%80%bb%e7%bb%93%e4%ba%86%e5%85%b3%e4%ba%8eusestate%e5%92%8cuseeffect%e7%9a%84%e5%86%85%e5%ae%b9%e3%80%82\/","title":{"rendered":"\u3010React\u3011\u5bf9\u4e8eReact\u521d\u5b66\u8005\uff0c\u6211\u603b\u7ed3\u4e86\u5173\u4e8euseState\u548cuseEffect\u7684\u5185\u5bb9"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d318837434c4406c5f3f6\/1-0.jpeg\" alt=\"1.jpg\" \/><\/div>\n<div>\u7531\u4e8e\u6211\u662f\u7f16\u7a0b\u521d\u5b66\u8005\uff0c\u6240\u4ee5\u5185\u5bb9\u53ef\u80fd\u5b58\u5728\u9519\u8bef\u3002<br \/>\n\u5982\u679c\u6709\u9519\u8bef\u7684\u8bdd\uff0c\u5e0c\u671b\u4f60\u80fd\u6307\u51fa\u6765\u3002<\/div>\n<h1>\u53cd\u5e94\u94a9\u5b50<\/h1>\n<p>\u8fd9\u6b21\u5b66\u5230\u7684useState\u548cuseEffect\u662fReact Hooks\u7684\u5176\u4e2d\u4e00\u4e2a\u3002<\/p>\n<h2>React Hooks\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u8fd9\u662f\u6765\u81ea\u4e8e2017\u5e749\u6708\u53d1\u5e03\u7684React16.8\u7684\u529f\u80fd\u3002<br \/>\n\u4ee5\u524d\uff0c\u53ea\u80fd\u5728\u7c7b\u7ec4\u4ef6\u4e2d\u5904\u7406\u7684State\u548c\u751f\u547d\u5468\u671f\u7684\u529f\u80fd\u73b0\u5728\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528Hooks\u6765\u9644\u52a0\u5230\u51fd\u6570\u7ec4\u4ef6\u4e0a\u3002<\/p>\n<h1>\u4f7f\u7528\u72b6\u6001<\/h1>\n<p>\u5728\u51fd\u6570\u7ec4\u4ef6\u4e2d\uff0c\u6709\u4e00\u4e2a\u7279\u522b\u5e38\u7528\u7684\u94a9\u5b50\u51fd\u6570\u53eb\u505auseState\u3002<br \/>\n\u4f7f\u7528useState\u53ef\u4ee5\u5728\u51fd\u6570\u7ec4\u4ef6\u5185\u90e8\u7ef4\u62a4\u72b6\u6001(state)\u3002<\/p>\n<h3>\u7528\u6cd5<\/h3>\n<pre class=\"post-pre\"><code>import { useState } from 'react';\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u5728\u9876\u5c42\u5bfc\u5165`useState`\uff0c\u60a8\u53ef\u4ee5\u5728\u4f7f\u7528\u4e2d\u4f7f\u7528\u5b83\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u72b6\u614b\uff08state\uff09\u3068\u305d\u306e\u72b6\u614b\u3092\u66f4\u65b0\u3059\u308b\u95a2\u6570\uff08setState\uff09\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/ul>\n<pre class=\"post-pre\"><code>const [state, setState] = useState(false);\r\n<\/code><\/pre>\n<div>\n<div class=\"post-table\">\u8a18\u8ff0\u540d\u5099\u8003<a href=\"#state\">state<\/a>\u73fe\u5728\u306e\u5024<a href=\"#setState\">setState<\/a>state\u306e\u72b6\u614b\u3092\u5909\u66f4\u3059\u308b\u95a2\u6570<a href=\"#false\">false<\/a>\u521d\u671f\u5024<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h2>&#8220;State\u662f\u4ec0\u4e48\u610f\u601d\uff1f&#8221;<\/h2>\n<p>React\u7684\u7ec4\u4ef6\u53ef\u4ee5\u5728\u5185\u90e8\u62e5\u6709&#8221;\u72b6\u6001&#8221;\u3002<\/p>\n<h3>\u60c5\u51b5<\/h3>\n<p>\u72b6\u6001\u662f\u6307\u5e94\u7528\u7a0b\u5e8f\u6216\u7ec4\u4ef6\u7684\u5f53\u524d\u4fe1\u606f\uff0c\u5e76\u88ab\u79f0\u4e3a&#8221;\u72b6\u6001&#8221;\u3002<\/p>\n<h3>\u56fd\u5bb6\u7684\u8d8b\u52bf<\/h3>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4fdd\u5b58\u7ec4\u4ef6\u72b6\u6001<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u5f53\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u81ea\u52a8\u66f4\u65b0\u7ec4\u4ef6\uff08\u91cd\u65b0\u6e32\u67d3\uff09\u3002<\/ol>\n<p>\u70b9\u51fb\u4e00\u6b21\uff0c\u6570\u5b57\u5c06\u4f1a\u589e\u52a01\u7684\u8ba1\u6570\u5668\u7ec4\u4ef6<\/p>\n<pre class=\"post-pre\"><code>import React, { useState } from 'react';\r\n\r\nfunction Counter() {\r\n  const [count, setCount] = useState(0);\r\n\r\n  return (\r\n    &lt;div&gt;\r\n      &lt;p&gt;Current Count: {count}&lt;\/p&gt;\r\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;+1&lt;\/button&gt;\r\n    &lt;\/div&gt;\r\n  );\r\n}\r\n\r\nexport default Counter;\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d318837434c4406c5f3f6\/24-0.gif\" alt=\"Image from Gyazo\" \/><\/div>\n<pre class=\"post-pre\"><code>&lt;button onClick={() =&gt; setCount(count + 1)}&gt;+1&lt;\/button&gt;\r\n<\/code><\/pre>\n<p>\u5728\u6309\u94ae\u4e0a\u6dfb\u52a0\u4e00\u4e2a onClick \u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff0c\u5f53\u70b9\u51fb\u65f6\u8c03\u7528 setCount \u51fd\u6570\u4ee5\u9012\u589e count \u7684\u503c\u3002<\/p>\n<p>\u66f4\u65b0\u51fd\u6570\uff08\u5e26\u6709\u201cset\u201d\u7684\u51fd\u6570\uff09\u5c06\u901a\u8fc7\u5c06\u5f53\u524d\u7684 count \u503c\u52a01\u6765\u66f4\u65b0 count\u3002<\/p>\n<pre class=\"post-pre\"><code>setCount(count + 1)\r\n<\/code><\/pre>\n<p>\u7136\u540e\u3001<\/p>\n<pre class=\"post-pre\"><code>&lt;p&gt;Current Count: {count}&lt;\/p&gt;\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u90e8\u5206\uff0c\u5f53\u524d\u7684count\u503c\u88ab\u5c55\u793a\u4e3aJavaScript\u53d8\u91cf\u3002(\u5728JSX\u7ed3\u6784\u5185\uff0c\u53ef\u4ee5\u4f7f\u7528JavaScript\u8868\u8fbe\u5f0f\uff0c\u7528{ }\u8868\u793a\u3002)<\/p>\n<p>\u901a\u8fc7\u4f7f\u7528useState\uff0c\u4f60\u53ef\u4ee5\u5728\u7ec4\u4ef6\u5185\u8fdb\u884c\u52a8\u6001\u5904\u7406\u3002<\/p>\n<h1>\u4f7f\u7528useEffect<\/h1>\n<p>useEffect \u662f\u5728 React \u7ec4\u4ef6\u4e2d\u7528\u4e8e\u6267\u884c\u526f\u4f5c\u7528\u7684\u94a9\u5b50\u3002<\/p>\n<h3>\u526f\u4f5c\u7528- \u9644\u5e26\u6548\u679c<\/h3>\n<p>\u6307\u7684\u662f\u4e0eUI\u7684\u6e32\u67d3\u65e0\u76f4\u63a5\u5173\u7cfb\u7684\u64cd\u4f5c\u3002<br \/>\n\u8fd9\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">API \u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30bf\u30a4\u30de\u30fc\u3092\u30bb\u30c3\u30c8\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">DOM \u30ce\u30fc\u30c9\u3092\u76f4\u63a5\u64cd\u4f5c\u3059\u308b \u306a\u3069\u3002<\/ul>\n<h3>\u6570\u7ec4\u4f9d\u5b58<\/h3>\n<p>\u5728React\u4e2d\uff0c\u53ef\u4ee5\u5c06&#8221;\u4f9d\u8d56\u6570\u7ec4&#8221;\u4f5c\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u9012\u7ed9useEffect\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>useEffect(() =&gt; {\r\n  \/\/ \u526f\u4f5c\u7528\u3092\u5b9f\u884c\u3059\u308b\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\r\n}, [\u4f9d\u5b58\u914d\u5217]);\r\n<\/code><\/pre>\n<div>\n<div class=\"post-table\">\u8a18\u8ff0\u540d\u5099\u8003<a href=\"#state\">\u526f\u4f5c\u7528<\/a>\u7b2c1\u5f15\u6570<a href=\"#setState\">\u4f9d\u5b58\u914d\u5217<\/a>\u7b2c2\u5f15\u6570<\/div>\n<\/div>\n<ul class=\"post-ul\">\u4f9d\u5b58\u914d\u5217\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408<\/ul>\n<p>\u53ea\u6709\u5f53\u6570\u7ec4\u4e2d\u7684\u503c\u53d1\u751f\u66f4\u6539\u65f6\uff0c\u526f\u4f5c\u7528\u624d\u4f1a\u91cd\u65b0\u6267\u884c\u3002<br \/>\n\u4ee5\u4e0b\u4ee3\u7801\u4e2d\uff0c\u5f53userId\u6539\u53d8\u65f6\uff0c\u5c06\u6267\u884c\u526f\u4f5c\u7528\u5904\u7406\uff0c\u4eceAPI\u83b7\u53d6\u7528\u6237\u6570\u636e\u3002<\/p>\n<pre class=\"post-pre\"><code>import React, { useState, useEffect } from 'react'; \/\/useEffect\u306e\u5b9a\u7fa9\r\n\r\nfunction UserProfile({ userId }) {\r\n  const [user, setUser] = useState(null);\r\n\r\n  useEffect(() =&gt; {\r\n    async function fetchUserData() {\r\n      const response = await fetch(`https:\/\/api.example.com\/users\/${userId}`);\r\n      const userData = await response.json();\r\n      setUser(userData);\r\n    }\r\n\r\n    fetchUserData();\r\n  }, [userId]);    \/\/ userId\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306e\u307f\u3053\u306e\u526f\u4f5c\u7528\u3092\u5b9f\u884c\r\n\r\n  return (\r\n    &lt;div&gt;\r\n      {\/* \u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u306e\u8868\u793a *\/}\r\n      {user &amp;&amp; &lt;div&gt;{user.name}&lt;\/div&gt;}\r\n    &lt;\/div&gt;\r\n  );\r\n}\r\n\r\nexport default UserProfile\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u4f9d\u5b58\u914d\u5217\u304c\u7a7a\u306e\u5834\u5408\uff08[]\uff09<\/ul>\n<p>useEffect\u5728\u7ec4\u4ef6\u6302\u8f7d\u540e\u4ec5\u6267\u884c\u4e00\u6b21\u3002<br \/>\n\u4e4b\u540e\uff0c\u5373\u4f7fprops\u6216state\u53d1\u751f\u53d8\u5316\u5bfc\u81f4UI\u91cd\u65b0\u6e32\u67d3\uff0c\u526f\u4f5c\u7528\u4e5f\u4e0d\u4f1a\u88ab\u518d\u6b21\u6267\u884c\u3002<\/p>\n<h3>\u5c06\u4ee5\u4e0b\u5185\u5bb9\u4ee5\u4e2d\u6587\u539f\u751f\u65b9\u5f0f\u6539\u5199\uff0c\u53ea\u9700\u4e00\u4e2a\u9009\u9879\uff1a<\/h3>\n<p>\u63f6\u63c4<\/p>\n<p>\u5728\u521b\u5efa\u7ec4\u4ef6\u65f6\uff0c\u6211\u4eec\u4f1a\u751f\u6210\u4e00\u4e2a\u4e0e\u5176\u5bf9\u5e94\u7684DOM\u8282\u70b9\uff0c\u5e76\u5c06\u5176\u63d2\u5165\u5230\u73b0\u6709\u7684DOM\u6811\u4e2d\uff0c\u5728\u7ec4\u4ef6\u9996\u6b21\u6e32\u67d3\u5230\u7f51\u9875\u4e0a\u65f6\u3002\u5378\u8f7d\u5219\u6307\u7684\u662f\u5f53DOM\u8282\u70b9\u4ece\u73b0\u6709\u7684DOM\u6811\u4e2d\u79fb\u9664\u3002<\/p>\n<p>\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u5f53\u7ec4\u4ef6\u88ab\u6302\u8f7d\u65f6\u8bbe\u7f6e\u4e00\u4e2a\u5b9a\u65f6\u5668\uff0c\u5e76\u5728\u7ec4\u4ef6\u88ab\u5378\u8f7d\u65f6\u6e05\u9664\u5b83\u3002<\/p>\n<pre class=\"post-pre\"><code>import React, { useState, useEffect } from 'react';\r\n\r\nfunction TimerComponent() {\r\n  const [seconds, setSeconds] = useState(0);\r\n\r\n  useEffect(() =&gt; {\r\n    const intervalId = setInterval(() =&gt; {\r\n      setSeconds(prevSeconds =&gt; prevSeconds + 1);\r\n    }, 1000);\r\n\r\n    return () =&gt; clearInterval(intervalId); \/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30a2\u30f3\u30de\u30a6\u30f3\u30c8\u6642\u306b\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb\u3092\u30af\u30ea\u30a2\r\n  }, []); \/\/ \u4f9d\u5b58\u914d\u5217\u304c\u7a7a\u306a\u306e\u3067\u3001\u30de\u30a6\u30f3\u30c8\u6642\u306b\u306e\u307f\u5b9f\u884c\u3055\u308c\u308b\r\n\r\n  return &lt;div&gt;\u7d4c\u904e\u79d2\u6570: {seconds}&lt;\/div&gt;;\r\n}\r\nexport default TimerComponent\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d318837434c4406c5f3f6\/51-0.gif\" alt=\"Image from Gyazo\" \/><\/div>\n<ul class=\"post-ul\">\u4f9d\u5b58\u914d\u5217\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\uff1a<\/ul>\n<p>\u526f\u4f5c\u7528\u5c06\u5728\u7ec4\u4ef6\u7b2c\u4e00\u6b21\u6302\u8f7d\u65f6\u6267\u884c\uff0c\u4ee5\u53ca\u968f\u540e\u7684\u6240\u6709\u66f4\u65b0\uff08\u91cd\u65b0\u6e32\u67d3\uff09\u540e\u6267\u884c\u3002\u5b83\u5c06\u5bf9state\u548cprops\u7684\u4efb\u4f55\u66f4\u6539\u505a\u51fa\u54cd\u5e94\u5e76\u6267\u884c\u526f\u4f5c\u7528\u3002<br \/>\n\u5728state\u6216props\u66f4\u65b0\u540e\uff0cUI\u5c06\u91cd\u65b0\u7ed8\u5236\uff0c\u7136\u540e\u6267\u884c\u5904\u7406\uff0c\u8fd9\u6837\u7ec4\u4ef6\u5728\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u6216\u66f4\u65b0\u65f6\u5c31\u53ef\u4ee5\u6267\u884c\u7279\u5b9a\u7684\u4ee3\u7801\u3002<\/p>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u968f\u7740\u5bf9useState\u548cuseEffect\u7684\u8fdb\u4e00\u6b65\u4e86\u89e3\uff0c\u6211\u4e5f\u7a0d\u5fae\u4e86\u89e3\u5230\u4e86React\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u5982\u72b6\u6001\uff0c\u526f\u4f5c\u7528\u548c\u6302\u8f7d\u3002\u4e3a\u4e86\u80fd\u591f\u6b63\u786e\u5730\u4f7f\u7528\u94a9\u5b50\u8fdb\u884c\u5b9e\u8df5\uff0c\u6211\u5c06\u7ee7\u7eed\u5b66\u4e60\u5e76\u6df1\u5165\u4e86\u89e3React\uff01<\/p>\n<h1>\u8bf7\u53c2\u8003\u4ee5\u4e0b\u6587\u732e\u3002<\/h1>\n<p>\u4e66\u7c4d (sh\u016b j\u00ed)<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u57fa\u790e\u304b\u3089\u5b66\u3076React 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