{"id":38177,"date":"2023-10-11T09:00:05","date_gmt":"2024-02-12T07:48:48","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8usecallback%e8%bf%9b%e8%a1%8c%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation\/"},"modified":"2024-10-21T18:42:05","modified_gmt":"2024-10-21T10:42:05","slug":"%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8usecallback%e8%bf%9b%e8%a1%8c%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8usecallback%e8%bf%9b%e8%a1%8c%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation\/","title":{"rendered":"\u3010React\u3011\u4f7f\u7528useCallback\u8fdb\u884c\u6027\u80fd\u4f18\u5316"},"content":{"rendered":"<p>\u8fd9\u662f\u5173\u4e8eReact\u6027\u80fd\u7684\u5907\u5fd8\u5f55\u3002<\/p>\n<h2>\u4e3a\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\u7684\u51fd\u6570<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">React.memo<\/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\">useCallback<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">useMemo<\/ul>\n<h2>React.memo\u53ef\u4ee5\u7528\u4e8e\u4f18\u5316React\u7ec4\u4ef6\u6027\u80fd\u3002<\/h2>\n<p>\u5f53\u63a5\u6536\u5230\u7684props\u503c\u76f8\u540c\u65f6\uff0c\u68c0\u6d4bstate\u7684\u5dee\u5f02\u5e76\u8df3\u8fc7\u91cd\u65b0\u6e32\u67d3\u3002\u5982\u679c\u7528React.memo\u5305\u56f4\uff0c\u5728\u88ab\u5305\u56f4\u7684\u7ec4\u4ef6\u7684props\u6ca1\u6709\u53d8\u5316\u65f6\uff0c\u5b50\u7ec4\u4ef6\u5c06\u4e0d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u4f7f\u7528React.memo\u6765\u5305\u88f9\u7684\u8bdd\uff0c\u65e0\u8bbaprops\u662f\u5426\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u5bfc\u81f4\u6574\u4e2a\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<h4>\u5f53\u51fd\u6570\u4f20\u9012\u7ed9props\u65f6<\/h4>\n<p>\u5728\u7ec4\u4ef6\u5185\u5b9a\u4e49\u7684\u51fd\u6570\u4f1a\u5728\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u65f6\u91cd\u65b0\u751f\u6210\uff08\u91cd\u65b0\u5b9a\u4e49\uff09\u3002<br \/>\n\u56e0\u6b64\uff0c\u5c3d\u7ba1\u88abReact.memo\u5305\u56f4\uff0c\u5e76\u4e14\u4f20\u9012\u4e86props\uff0c\u5b83\u4ecd\u7136\u4f1a\u5bfc\u81f4\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<pre class=\"post-pre\"><code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8A\r\nconst handleClick = ()=&gt; {\u30fb\u30fb\u30fb}\r\n\r\n\u21c5 \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u524d\u5f8c\u3067\u7570\u306a\u308b\u95a2\u6570\r\n\r\n\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8A(\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0)\r\nconst handleClick = ()=&gt; {\u30fb\u30fb\u30fb}\r\n\r\n<\/code><\/pre>\n<p>\u53ea\u6709\u4f7f\u7528React.memo\u65e0\u6cd5\u963b\u6b62\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u5f0f\u662f&#8230;<\/p>\n<h2>\u4f7f\u7528useCallback<\/h2>\n<p>\u5728\u7ec4\u4ef6\u5185\u5b9a\u4e49\u7684\u201c\u51fd\u6570\u201d\uff0c\u53ef\u4ee5\u8bb0\u4f4f\u5e76\u91cd\u590d\u4f7f\u7528\uff0c\u4ece\u800c\u9632\u6b62\u5728\u6e32\u67d3\u65f6\u88ab\u591a\u6b21\u751f\u6210\u3002<\/p>\n<p>\u5982\u679c\u5728\u5b50\u7ec4\u4ef6\u4e2d\u4f20\u9012\u51fd\u6570\uff0c\u5219\u53ef\u4ee5\u9632\u6b62\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5982\u679c\u5bf9\u8be5\u51fd\u6570\u6ca1\u6709\u8fdb\u884c\u4efb\u4f55\u66f4\u6539\uff0cReact.memo\u529f\u80fd\u5c06\u88ab\u6fc0\u6d3b\uff0c\u4ece\u800c\u9632\u6b62\u5b50\u7ec4\u4ef6\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u9664\u4e86\u7ec4\u4ef6\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u5982\u4f55\u7f13\u5b58\u5404\u79cd\u6570\u503c\u5462\uff1f<\/p>\n<h2>\u4f7f\u7528useMemo<\/h2>\n<p>\u9664\u4e86\u7ec4\u4ef6\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u5b58\u50a8\u503c\u3002\u53ef\u4ee5\u5bf9\u8017\u8d39\u8f83\u9ad8\u7684\u5904\u7406\u8fc7\u7a0b\u8fdb\u884c\u8bb0\u5fc6\u5904\u7406\u3002<br \/>\n\u7136\u800c\uff0c\u7531\u4e8e\u6267\u884cuseMemo\u672c\u8eab\u4e5f\u9700\u8981\u6210\u672c\uff0c\u6240\u4ee5\u53ea\u5e94\u5728\u7e41\u91cd\u7684\u5904\u7406\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u3002<\/p>\n<p>\u203b\u4e0d\u5e94\u8be5\u5c06\u6240\u6709\u4e1c\u897f\u90fd\u7528useMemo\u8fdb\u884c\u4f18\u5316<br \/>\n\u2517 \u7531\u4e8e\u5904\u7406\u672c\u8eab\u4e5f\u6709\u8ba1\u7b97\u6210\u672c\uff0c\u6240\u4ee5\u4ec5\u5728\u91cd\u578b\u5904\u7406\u4e2d\u4f7f\u7528\u3002<\/p>\n<p>\u901a\u8fc7\u963b\u6b62\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u6765\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h2>\u8fdb\u4e00\u6b65\u5b66\u4e60\u6709\u5173useCallback\u7684\u5185\u5bb9\u3002<\/h2>\n<p>useCallback\u662fReact Hook\uff0c\u5b83\u53ef\u4ee5\u5728\u91cd\u65b0\u6e32\u67d3\u671f\u95f4\u7f13\u5b58\u51fd\u6570\u5b9a\u4e49\u3002<\/p>\n<p>\u4f7f\u7528`useCallback(fn, dependencies)`<\/p>\n<blockquote><p>\u51fd\u6570\u53c2\u6570\uff1a\u7f13\u5b58\u51fd\u6570\u7684\u503c\u3002\u53ef\u4ee5\u63a5\u6536\u4efb\u610f\u7684\u53c2\u6570\u5e76\u8fd4\u56de\u4efb\u610f\u7684\u503c\u3002\u5728React\u7684\u9996\u6b21\u6e32\u67d3\u4e2d\uff0c\u5b83\u5c06\u8fd4\u56de\u51fd\u6570\uff08\u4e0d\u662f\u8c03\u7528\uff01\uff09\u3002\u5728\u4e0b\u4e00\u6b21\u6e32\u67d3\u65f6\uff0c\u5982\u679c\u4e0a\u4e00\u6b21\u6e32\u67d3\u540e\u6ca1\u6709\u53d8\u5316\uff0cReact\u5c06\u518d\u6b21\u63d0\u4f9b\u76f8\u540c\u7684\u51fd\u6570\u3002\u5426\u5219\uff0c\u5b83\u5c06\u63d0\u4f9b\u5728\u5f53\u524d\u6e32\u67d3\u4e2d\u4f20\u9012\u7684\u51fd\u6570\u5e76\u5c06\u5176\u4fdd\u5b58\u4ee5\u4fbf\u4ee5\u540e\u91cd\u7528\u3002React\u4e0d\u4f1a\u76f4\u63a5\u8c03\u7528\u51fd\u6570\u3002\u5b83\u4f1a\u8fd4\u56de\u51fd\u6570\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u51b3\u5b9a\u4f55\u65f6\u8c03\u7528\u5b83\u6216\u662f\u5426\u8c03\u7528\u5b83\u3002<\/p><\/blockquote>\n<blockquote><p>\u4f9d\u5b58\u9879: fn \u662f\u4e00\u4e2a\u5217\u8868\uff0c\u5305\u542b\u5728\u4ee3\u7801\u4e2d\u88ab\u5f15\u7528\u7684\u6240\u6709\u54cd\u5e94\u5f0f\u503c\u3002\u54cd\u5e94\u5f0f\u503c\u5305\u62ec props\u3001state \u548c\u7ec4\u4ef6\u5185\u76f4\u63a5\u58f0\u660e\u7684\u6240\u6709\u53d8\u91cf\u548c\u51fd\u6570\u3002\u5982\u679c\u4f7f\u7528\u7684\u662f\u914d\u7f6e\u4e3a React \u7684 linter\uff0c\u5c06\u9a8c\u8bc1\u6240\u6709\u54cd\u5e94\u5f0f\u503c\u662f\u5426\u6b63\u786e\u6307\u5b9a\u4e3a\u4f9d\u8d56\u5173\u7cfb\u3002\u4f9d\u8d56\u5173\u7cfb\u5217\u8868\u5fc5\u987b\u5305\u542b\u4e00\u5b9a\u6570\u91cf\u7684\u9879\uff0c\u5e76\u9700\u8981\u4ee5\u5185\u8054\u65b9\u5f0f\u8fdb\u884c\u63cf\u8ff0[dep1, dep2, dep3]\u3002React \u4f7f\u7528\u6bd4\u8f83\u7b97\u6cd5\u5c06\u6bcf\u4e2a\u4f9d\u8d56\u9879\u4e0e\u5148\u524d\u7684\u503c\u8fdb\u884c\u6bd4\u8f83\uff0c\u4f7f\u7528\u7684\u7b97\u6cd5\u4e3a Object.is\u3002<\/p><\/blockquote>\n<p>React\u516c\u5f0f\u6587\u6863\u7684\u542b\u4e49\u3002<\/p>\n<h3>\u7528\u7b80\u5355\u7684\u4ee3\u7801\u8fdb\u884c\u89e3\u91ca\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"p\">(<\/span><span class=\"nx\">\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">Child<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">.\/Child<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Example<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">Parent render<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  \r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">countA<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCountA<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">countB<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCountB<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">clickHandler<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">setCountB<\/span><span class=\"p\">((<\/span><span class=\"nx\">pre<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">pre<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span> <span class=\"nx\">className<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">parent<\/span><span class=\"dl\">\"<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">h3<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u9818\u57df<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/h3<\/span><span class=\"err\">&gt;\r\n<\/span>        <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n          <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span>\r\n            <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n              <span class=\"nf\">setCountA<\/span><span class=\"p\">((<\/span><span class=\"nx\">pre<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">pre<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n            <span class=\"p\">}}<\/span>\r\n          <span class=\"o\">&gt;<\/span>\r\n            <span class=\"nx\">\u30dc\u30bf\u30f3A<\/span>\r\n          <span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>          <span class=\"o\">&lt;<\/span><span class=\"nx\">span<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u89aa\u306estate\u3092\u66f4\u65b0<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/span<\/span><span class=\"err\">&gt;\r\n<\/span>        <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n          <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u30dc\u30bf\u30f3A\u30af\u30ea\u30c3\u30af\u56de\u6570<\/span><span class=\"err\">\uff1a<\/span><span class=\"p\">{<\/span><span class=\"nx\">countA<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">Child<\/span> <span class=\"nx\">countB<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">countB<\/span><span class=\"p\">}<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">clickHandler<\/span><span class=\"p\">}<\/span><span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">Example<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"p\">(<\/span><span class=\"nx\">\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">memo<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">react<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">ChildMemo<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">memo<\/span><span class=\"p\">(({<\/span> <span class=\"nx\">countB<\/span><span class=\"p\">,<\/span> <span class=\"nx\">onClick<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">%cChild render<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">color: red;<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span> <span class=\"nx\">className<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">child<\/span><span class=\"dl\">\"<\/span><span class=\"o\">&gt;<\/span>\r\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">h2<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u5b50\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u9818\u57df<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/h2<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\r\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span>\r\n          <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">onClick<\/span><span class=\"p\">}<\/span>\r\n        <span class=\"o\">&gt;<\/span>\r\n          <span class=\"nx\">\u30dc\u30bf\u30f3B<\/span>\r\n        <span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\r\n<\/span>        <span class=\"o\">&lt;<\/span><span class=\"nx\">span<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u5b50\u306eprops\u306b\u6e21\u3059state\u3092\u66f4\u65b0<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/span<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">span<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">\u30dc\u30bf\u30f3B\u30af\u30ea\u30c3\u30af\u56de\u6570<\/span><span class=\"err\">\uff1a<\/span><span class=\"p\">{<\/span><span class=\"nx\">countB<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/span<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>  <span class=\"p\">);<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">ChildMemo<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u7236\u7ec4\u4ef6\u4e2d\u6709\u6309\u94aeA\u3002<br \/>\n\u5728\u5b50\u7ec4\u4ef6\u4e2d\u6709\u6309\u94aeB\uff0c\u5e76\u4e14\u5728\u7236\u7ec4\u4ef6\u4e2d\u5b9a\u4e49\u4e86\u6309\u4e0b\u6309\u94ae\u65f6\u7684\u884c\u4e3a\u51fd\u6570\u3002<\/p>\n<p>\u4f7f\u7528props\u5c06onClick\u4f20\u9012\u3002<\/p>\n<p>\u6309\u4e0b\u6309\u94aeA\u540e\uff0c\u72b6\u6001\u5c06\u4f1a\u88ab\u66f4\u65b0\u3002<br \/>\n\u5728\u7236\u7ec4\u4ef6\u548c\u5b50\u7ec4\u4ef6\u4e2d\u90fd\u4f7f\u7528console.log\u8fdb\u884c\u8bb0\u5f55\uff0c\u901a\u8fc7\u63a7\u5236\u53f0\u786e\u8ba4\u540e\uff0c\u4e24\u8005\u90fd\u4f1a\u88ab\u8c03\u7528\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32b037434c4406c62f34\/32-0.png\" alt=\"undefined\" \/><\/div>\n<p>\u4ece\u8fd9\u4ef6\u4e8b\u53ef\u4ee5\u770b\u51fa\uff0c\u5f53\u6309\u4e0b\u7236\u7ec4\u4ef6\u4e2d\u7684\u6309\u94aeA\u65f6\uff0c\u7236\u7ec4\u4ef6\u548c\u5b50\u7ec4\u4ef6\u90fd\u88ab\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u65e0\u8bba\u5728Child.js\u4e2d\u4f7f\u7528memo\u6765\u4f20\u9012props\uff0c\u6211\u4eec\u90fd\u53ef\u4ee5\u770b\u5230\u5b50\u7ec4\u4ef6\u88ab\u91cd\u65b0\u6e32\u67d3\u4e86\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32b037434c4406c62f34\/35-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2023-08-31 14.36.16.png\" \/><\/div>\n<p>\u7406\u7531\u662f\u56e0\u4e3a\u7236\u7ec4\u4ef6\u7684const clickHandler\u51fd\u6570\u5728\u6bcf\u6b21\u7236\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\u88ab\u91cd\u65b0\u5b9a\u4e49\uff0c\u6240\u4ee5\u4f20\u9012\u7ed9\u7684props\u4e2d\u7684clickHandler\u548c\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\u5b9a\u4e49\u7684const clickHandler\u51fd\u6570\u662f\u4e0d\u540c\u7684\u4e1c\u897f\u3002<\/p>\n<pre class=\"post-pre\"><code>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8A\r\nconst clickHandler = () =&gt;  {\u30fb\u30fb\u30fb}\r\n\r\n\u21c5 \u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u524d\u5f8c\u3067\u7570\u306a\u308b\u95a2\u6570\r\n\r\n\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8A(\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0)\r\nconst clickHandler = () =&gt;  {\u30fb\u30fb\u30fb}\r\n\r\n<\/code><\/pre>\n<p>\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528useCallback\u6765\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898\uff0c\u5bf9clickHandler\u51fd\u6570\u8fdb\u884c\u5305\u88f9\u3002<\/p>\n<pre class=\"post-pre\"><code>  const clickHandler = useCallback(() =&gt; {\r\n    setCountB((pre) =&gt; pre + 1);\r\n  },[])\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5fc5\u987b\u5411\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u5165\u4e00\u4e2a\u7a7a\u6570\u7ec4\u3002<br \/>\n\u7b2c\u4e8c\u4e2a\u53c2\u6570\u88ab\u79f0\u4e3a\u4f9d\u8d56\u6570\u7ec4\u3002<\/p>\n<p>\u5f53\u4f7f\u7528useCallback\u5305\u88f9\u4e86\u6309\u94aeA\u65f6\uff0c\u518d\u6b21\u6309\u4e0b\u6309\u94aeA\u540e\uff0c\u5b50\u7ec4\u4ef6\u5c06\u4e0d\u518d\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32b037434c4406c62f34\/42-0.png\" alt=\"undefined\" \/><\/div>\n<p>\u901a\u8fc7\u4f7f\u7528useCallback\uff0c\u4e0d\u9700\u8981\u6bcf\u6b21\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff0c\u4e00\u65e6\u4f20\u9012\u7ed9useCallback\u7684\u51fd\u6570\u5c06\u5728React\u5185\u90e8\u4fdd\u5b58\u3002<\/p>\n<p>\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u7531\u4e8eReact\u5185\u90e8\u8fd4\u56de\u4e86\u5728ClickHandler\u51fd\u6570\u4e2d\u4fdd\u6301\u7684\u51fd\u6570\uff0c\u56e0\u6b64\u5c06\u4f7f\u7528\u6700\u521d\u5b9a\u4e49\u7684\u51fd\u6570\u6765\u8fdb\u884c\u5faa\u73af\u6267\u884c\u3002<\/p>\n<p>\u5728\u5b50\u7ec4\u4ef6\u4e2d\u63a5\u6536\u51fd\u6570\u65f6\uff0c\u6700\u597d\u5728\u7236\u7ec4\u4ef6\u4e2d\u4f7f\u7528useCallback\u5305\u88f9\u60f3\u8981\u4f20\u9012\u7684\u51fd\u6570\u3002<\/p>\n<h2>\u5173\u4e8e\u7b2c\u4e8c\u4e2a\u4f9d\u8d56\u6570\u7ec4<\/h2>\n<p>\u5f53\u5305\u542b\u5728\u4f9d\u5b58\u6570\u7ec4\u4e2d\u7684state\u7684\u503c\u88ab\u66f4\u65b0\u65f6\uff0c\u901a\u8fc7useCallback\u4f20\u9012\u7684\u51fd\u6570\u4f1a\u88abReact\u5185\u90e8\u91cd\u5199\uff0c\u4ece\u800c\u53ef\u4ee5\u4f7f\u7528\u6700\u65b0\u7684state\u7684\u503c\u3002<\/p>\n<p>\u5982\u679c\u5c06countA\u5305\u542b\u5728\u7b2c\u4e8c\u4e2a\u53c2\u6570\u7684\u4f9d\u8d56\u6570\u7ec4\u4e2d\uff0c\u90a3\u4e48\u6bcf\u5f53\u8ba1\u6570\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u51fd\u6570\u90fd\u4f1a\u5728React\u5185\u90e8\u88ab\u91cd\u65b0\u4fdd\u6301\uff0c\u8fd9\u6837\u5728\u6bcf\u6b21\u6e32\u67d3\u65f6\u90fd\u4f1a\u5c06\u4e0d\u540c\u7684\u51fd\u6570\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u7684props\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6309\u4e0b\u201c\u6309\u94aeA\u201d\u5c06\u5bfc\u81f4Child\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<pre class=\"post-pre\"><code>  const clickHandler = useCallback(() =&gt; {\r\n    setCountB((pre) =&gt; pre + 1);\r\n  },[countA])\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32b037434c4406c62f34\/51-0.png\" alt=\"undefined\" \/><\/div>\n<p>\u5373\u4f7f\u5728\u7236\u7ec4\u4ef6\u4e2d\u5b58\u5728\u201c\u6309\u94aeA\u201d\uff0c\u4e5f\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<p>\u5982\u679c\u6309\u4e0b\u6309\u94aeA\u65f6\u4e0d\u5c06countA\u5305\u542b\u5728\u4f9d\u5b58\u6570\u7ec4\u4e2d<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32b037434c4406c62f34\/54-0.png\" alt=\"undefined\" \/><\/div>\n<h2>\u8bf7\u53c2\u8003<\/h2>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u5173\u4e8eReact\u6027\u80fd\u7684\u5907\u5fd8\u5f55\u3002 \u4e3a\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\u7684\u51fd\u6570 React.memo &nbsp; useCallba [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38177","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010React\u3011\u4f7f\u7528useCallback\u8fdb\u884c\u6027\u80fd\u4f18\u5316 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u4f7f\u7528usecallback\u8fdb\u884c\u6027\u80fd\u4f18\u5316-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010React\u3011\u4f7f\u7528useCallback\u8fdb\u884c\u6027\u80fd\u4f18\u5316\" \/>\n<meta property=\"og:description\" content=\"\u8fd9\u662f\u5173\u4e8eReact\u6027\u80fd\u7684\u5907\u5fd8\u5f55\u3002 \u4e3a\u9632\u6b62\u91cd\u65b0\u6e32\u67d3\u7684\u51fd\u6570 React.memo &nbsp; useCallba [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010react\u3011\u4f7f\u7528usecallback\u8fdb\u884c\u6027\u80fd\u4f18\u5316-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-12T07:48:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-10-21T10:42:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d32b037434c4406c62f34\/32-0.png\" \/>\n<meta name=\"author\" content=\"\u65b0, \u97f5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u65b0, \u97f5\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8usecallback%e8%bf%9b%e8%a1%8c%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react%e3%80%91%e4%bd%bf%e7%94%a8usecallback%e8%bf%9b%e8%a1%8c%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96-note-the-given-phrase-is-written-in-japanese-not-chinese-hence-the-provided-translation\/\",\"name\":\"\u3010React\u3011\u4f7f\u7528useCallback\u8fdb\u884c\u6027\u80fd\u4f18\u5316 - Blog - Silicon 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