{"id":38560,"date":"2023-10-25T20:43:54","date_gmt":"2023-12-25T23:00:06","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%bd%93%e6%88%91%e7%a0%94%e7%a9%b6%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-usereducer-%e7%9a%84%e6%97%b6%e5%80%99%ef%bc%8c%e6%88%91%e5%90%8c%e6%97%b6%e8%8e%b7%e5%be%97%e4%ba%86%e5%85%b3%e4%ba%8e-javascr\/"},"modified":"2024-05-04T05:58:48","modified_gmt":"2024-05-03T21:58:48","slug":"%e5%bd%93%e6%88%91%e7%a0%94%e7%a9%b6%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-usereducer-%e7%9a%84%e6%97%b6%e5%80%99%ef%bc%8c%e6%88%91%e5%90%8c%e6%97%b6%e8%8e%b7%e5%be%97%e4%ba%86%e5%85%b3%e4%ba%8e-javascr","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%bd%93%e6%88%91%e7%a0%94%e7%a9%b6%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-usereducer-%e7%9a%84%e6%97%b6%e5%80%99%ef%bc%8c%e6%88%91%e5%90%8c%e6%97%b6%e8%8e%b7%e5%be%97%e4%ba%86%e5%85%b3%e4%ba%8e-javascr\/","title":{"rendered":"\u5f53\u6211\u7814\u7a76\u5982\u4f55\u4f7f\u7528 useReducer \u7684\u65f6\u5019\uff0c\u6211\u540c\u65f6\u83b7\u5f97\u4e86\u5173\u4e8e JavaScript \u548c React \u7684\u77e5\u8bc6"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u6211\u6b63\u5728\u4f7f\u7528React\u6765\u521b\u5efa\u6211\u7684\u6295\u8d44\u7ec4\u5408\u3002<\/p>\n<p>\u5728\u8868\u5355\u9875\u9762\u4f7f\u7528 useReducer \u7684\u65f6\u5019\uff0c\u6211\u53d1\u73b0\u5bf9\u4e8e\u5177\u6709\u5c42\u7ea7\u7684\u5bf9\u8c61\u5904\u7406\u5f97\u4e0d\u591f\u597d\u3002<br \/>\n\u5177\u4f53\u6765\u8bf4\uff0c\u5f53\u5728\u540c\u4e00\u4e2a\u51fd\u6570\u5185\u591a\u6b21\u4f7f\u7528 dispatch \u6765\u66f4\u65b0\u5bf9\u8c61\u65f6\uff0c\u4f1a\u51fa\u73b0\u5bf9\u4e8e\u6df1\u5c42\u6b21\u7684\u5bf9\u8c61\u66f4\u65b0\u9057\u6f0f\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u5f53\u6211\u5f00\u59cb\u8c03\u67e5\u65f6\uff0c\u6211\u5bf9React\u7684\u673a\u5236\u4ee5\u53caJavaScript\u672c\u8eab\u7684\u673a\u5236\u6709\u4e86\u66f4\u6df1\u7684\u7406\u89e3\uff0c\u6240\u4ee5\u8fd9\u662f\u6211\u4e2a\u4eba\u7684\u5907\u5fd8\u5f55\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u7528\u4e8e\u8bf4\u660e\u7684\u4ee3\u7801\uff1a<br \/>\n<iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" title=\"blissful-sanderson-sm3ccf\" width=\"500\" height=\"750\" src=\"https:\/\/codesandbox.io\/embed\/blissful-sanderson-sm3ccf?file=\/src\/ReducerComp2.jsx#?secret=mG1HxQmjea\" data-secret=\"mG1HxQmjea\"><\/iframe><\/p>\n<h1>\u4e8b\u4ef6\u7684\u8d77\u56e0<\/h1>\n<p>\u6211\u6b63\u5728\u521b\u5efa\u4e00\u4e2a\u5173\u4e8e\u5177\u6709\u5c42\u6b21\u7ed3\u6784\u7684\u5bf9\u8c61\u7684\u8868\u5355\u3002<br \/>\n\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5316\u7684\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">initdata<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"na\">dept1_a<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept1_a<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">dept1_b<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept1_b<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">dept1_c<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">dept2_d<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept2_d<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">dept2_e<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept2_e<\/span><span class=\"dl\">\"<\/span>\r\n      <span class=\"p\">}<\/span>\r\n    <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4f7f\u7528 useReducer \u6765\u7ba1\u7406\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u5e76\u5c06\u5bf9\u8c61\u7684\u503c\u8d4b\u7ed9\u6bcf\u4e2a input \u5143\u7d20\u7684 value\uff0c\u5c06 dispatch \u51fd\u6570\u8d4b\u7ed9 onChange\u3002\uff08\u540e\u9762\u4f1a\u660e\u767d\uff0c\u8fd9\u662f reducer \u51fd\u6570\u7684\u539f\u56e0\uff09<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">const<\/span> <span class=\"nx\">reducer<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"nx\">newDetails<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"p\">...<\/span><span class=\"nx\">newDetails<\/span> <span class=\"p\">});<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">data1<\/span><span class=\"p\">,<\/span> <span class=\"nx\">dispatch1<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useReducer<\/span><span class=\"p\">(<\/span><span class=\"nx\">reducer<\/span><span class=\"p\">,<\/span> <span class=\"nx\">initdata<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u6bcf\u4e2a\u9879\u76ee\u4e2d\u521b\u5efa\u4e00\u4e2a\u8f93\u5165\u5143\u7d20\uff0c\u7136\u540e\u5728\u5176onChange\u4e8b\u4ef6\u4e2d\u5411dispatch\u51fd\u6570\u4f20\u9012\u503c\u5e76\u66f4\u65b0\u5bf9\u8c61\u662f\u6ca1\u6709\u95ee\u9898\u7684\u3002<br \/>\n\u7136\u800c\uff0c\u5f53\u5c1d\u8bd5\u5bf9\u6574\u4e2a\u5bf9\u8c61\u8fdb\u884c\u66f4\u65b0\uff0c\u4f8b\u5982\u5728\u53d1\u9001\u4e4b\u524d\u8fdb\u884c\u68c0\u67e5\u65f6\uff0c\u6df1\u5c42\u6b21\u7684\u9879\u76ee\u5c06\u4e0d\u4f1a\u88ab\u66f4\u65b0\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50, \u53ef\u4ee5\u50cf\u4e0b\u9762\u8fd9\u6837\u60f3\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">const<\/span> <span class=\"nx\">initdata<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"na\">dept1_a<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">dept1_b<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">dept1_c<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">dept2_d<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept2_d<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ Not Updated<\/span>\r\n        <span class=\"na\">dept2_e<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"\"<\/span><span class=\"s2\">\r\n      }\r\n    };\r\n<\/span><\/code><\/pre>\n<h2>\u7a76\u7adf\u662f\u4ec0\u4e48\u539f\u56e0\u5462\uff1f<\/h2>\n<p>\u539f\u56e0\u5728\u4e8ereducer\u51fd\u6570\u7684\u4f7f\u7528\u65b9\u5f0f\u4ee5\u53ca\u76f8\u5e94\u7684dispatch\u51fd\u6570\u7684\u8c03\u7528\u65b9\u6cd5\u3002<br \/>\n\u4ee5\u4e0b\u662f\u540c\u65f6\u4f7f\u7528reducer\u51fd\u6570\u548cdispatch\u51fd\u6570\u7684\u90e8\u5206\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"c1\">\/\/ reducer\u95a2\u6570<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">reducer<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"nx\">newDetails<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">({<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"p\">...<\/span><span class=\"nx\">newDetails<\/span> <span class=\"p\">});<\/span>\r\n\r\n    <span class=\"c1\">\/\/ dispatch\u95a2\u6570\u306e\u4f7f\u7528<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">updateAllparam<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nf\">dispatch1<\/span><span class=\"p\">({<\/span> <span class=\"na\">dept1_a<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">});<\/span>\r\n      <span class=\"nf\">dispatch1<\/span><span class=\"p\">({<\/span> <span class=\"na\">dept1_b<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">});<\/span>\r\n      <span class=\"nf\">dispatch1<\/span><span class=\"p\">({<\/span>\r\n        <span class=\"na\">dept1_c<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data1<\/span><span class=\"p\">.<\/span><span class=\"nx\">dept1_c<\/span><span class=\"p\">,<\/span> <span class=\"p\">...{<\/span> <span class=\"na\">dept2_d<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\r\n      <span class=\"p\">});<\/span>\r\n      <span class=\"nf\">dispatch1<\/span><span class=\"p\">({<\/span>\r\n        <span class=\"na\">dept1_c<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data1<\/span><span class=\"p\">.<\/span><span class=\"nx\">dept1_c<\/span><span class=\"p\">,<\/span> <span class=\"p\">...{<\/span> <span class=\"na\">dept2_e<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">UPDATED BY BOTTON<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">}<\/span> <span class=\"p\">}<\/span>\r\n      <span class=\"p\">});<\/span>\r\n    <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5c1d\u8bd5\u66f4\u65b0\u7b2c\u56db\u6b21\u7684dept2_e\u5904\u7406\u3002<br \/>\ndept1_c: {&#8230;data1.dept1_c, &#8230;{ dept2_e: &#8220;\u88ab\u6309\u94ae\u66f4\u65b0&#8221; }}\u3002<br \/>\n\u8fd9\u91cc\u6211\u4eec\u4ece&#8230;data1.dept1_c\u83b7\u53d6\u4e86data1.dept1_c\u7684\u503c\u3002<\/p>\n<p>\u5728\u8fdb\u884c`updateAllparam`\u51fd\u6570\u8c03\u7528\u4e4b\u524d\uff0c`data1.dept1_c`\u7684\u503c\u662f\u600e\u6837\u7684\u5462\uff1f\uff08\u5b83\u662f\u5426\u5728`updateAllparam`\u51fd\u6570\u4e2d\u53d1\u751f\u4e86\u53d8\u5316\uff1f\uff09<\/p>\n<p>\u603b\u7ed3\u6765\u8bf4\uff0c`data1`\u7684\u503c\u662f\u5728`updateAllparam`\u51fd\u6570\u8c03\u7528\u4e4b\u524d\uff08\u53ef\u80fd\u628a\u5b83\u770b\u4f5c\u662fReact\u6700\u540e\u4e00\u6b21\u6e32\u67d3\u65f6\uff09\u7684\u503c\uff0c\u5728\u8fd9\u4e2a\u65f6\u70b9\u4e0a\uff0c\u5b83\u6ca1\u6709\u53d1\u751f\u53d8\u5316\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5728\u8fd9\u91cc\u83b7\u53d6\u7684data1.dept1_c\u5c06\u4fdd\u6301\u539f\u6837\uff0c\u800cdept2_d\u5c06\u88ab\u91cd\u5199\u4e3a&#8221;dept2_d\u3002<\/p>\n<p>\u8fd9\u4e2a\u73b0\u8c61\u5728\u5b98\u65b9\u5df2\u7ecf\u6709\u89e3\u91ca\u8bf4\u660e\u4e86\u3002<br \/>\nhttps:\/\/react.dev\/reference\/react\/useReducer#\u6211\u5df2\u7ecf\u6d3e\u53d1\u4e86\u4e00\u4e2aaction\u4f46\u65e5\u5fd7\u4ecd\u663e\u793a\u4e4b\u524d\u7684\u72b6\u6001\u503c\u3002<\/p>\n<p>\u5f53\u65f6\uff0c\u6211\u5bf9React\u5982\u4f55\u5904\u7406\u72b6\u6001\u4ee5\u53caJS\u7684\u4e8b\u4ef6\u5faa\u73af\u548c\u4efb\u52a1\u961f\u5217\u4e00\u65e0\u6240\u77e5\u3002\u56e0\u6b64\uff0c\u6211\u5f53\u65f6\u60f3\u7684\u662f&#8221;React\u662f\u5426\u5728\u540e\u53f0\u6267\u884c\u4e86\u4e00\u4e9b\u7c7b\u4f3c\u961f\u5217\u7684\u64cd\u4f5c\uff0c\u7136\u540e\u4f7f\u7528\u6700\u7ec8\u7684\u503c\u8fdb\u884c\u6e32\u67d3\u5462\uff1f\u8fd9\u6837\uff0c\u6211\u4e5f\u80fd\u7406\u89e3\u4e3a\u4ec0\u4e48\u5728setState\u4e2d\u9700\u8981\u5c06prev\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165&#8230;&#8221;\uff0c\u6240\u4ee5\u6211\u9996\u5148\u641c\u7d22\u4e86\u5173\u4e8eReact\u548c\u961f\u5217\u7684\u5185\u5bb9\u3002<\/p>\n<h1>React\u7684\u6e32\u67d3\u548c\u961f\u5217<\/h1>\n<p>\u7ecf\u8fc7\u8c03\u67e5\u7684\u7ed3\u679c\u8868\u660e\uff0cReact \u5728\u5176\u6e32\u67d3\u8fc7\u7a0b\u4e2d\u786e\u5b9e\u4f7f\u7528\u4e86\u961f\u5217\u3002<\/p>\n<p>(\u8bf4\u5b9e\u8bdd\uff0c\u6587\u4ef6\u4e0a\u660e\u786e\u5199\u7740Baribari Queue)<\/p>\n<p>\u4f46\u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u56e0\u7d20\u5728\u8d77\u4f5c\u7528\u3002React \u5728\u5904\u7406\u72b6\u6001\u66f4\u65b0\u4e4b\u524d\u4f1a\u7b49\u5f85\u6240\u6709\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4e2d\u7684\u4ee3\u7801\u8fd0\u884c\u5b8c\u6bd5\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u53ea\u6709\u5728\u6240\u6709\u8fd9\u4e9b setNumber() \u8c03\u7528\u4e4b\u540e\u624d\u4f1a\u53d1\u751f\u91cd\u65b0\u6e32\u67d3\u7684\u539f\u56e0\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4e2a\u4eba\u800c\u8a00\uff0c\u6211\u89c9\u5f97\u8fd9\u7bc7\u6587\u7ae0\u4e5f\u5f88\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u56e0\u6b64\uff0c\u53ea\u6709\u7b49\u5f85\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u5185\u7684\u6240\u6709\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\uff0c\u624d\u4f1a\u5904\u7406\u72b6\u6001\u7684\u66f4\u65b0\u3002\u56e0\u6b64\uff0c\u5728\u6e32\u67d3\u4e4b\u524d\uff0c\u4f3c\u4e4e\u65e0\u6cd5\u4ece\u53d8\u91cf\u4e2d\u83b7\u53d6\u66f4\u65b0\u540e\u7684\u503c\u3002<\/p>\n<h2>JavaScript\u4e2d\u7684\u5f02\u6b65\u5904\u7406\u673a\u5236<\/h2>\n<p>\u5728\u8c03\u67e5\u961f\u5217\u8fc7\u7a0b\u4e2d\uff0c\u6211\u5f00\u59cb\u6000\u7591JavaScript\u7a76\u7adf\u4ee5\u4f55\u79cd\u65b9\u5f0f\u8fdb\u884c\u5f02\u6b65\u5904\u7406\u3002<\/p>\n<p>\u88ab\u8c03\u7528\u7684\u51fd\u6570\u5c06\u88ab\u653e\u7f6e\u5728\u5806\u6808\u4e2d\u8fdb\u884c\u8bc4\u4f30\u3002<br \/>\n&#8211; \u5982\u679c\u662f\u540c\u6b65\u51fd\u6570\uff0c\u5219\u4f1a\u7acb\u5373\u6267\u884c\u3002<br \/>\n&#8211; \u5982\u679c\u662f\u5f02\u6b65\u51fd\u6570\uff0c<br \/>\n1. \u4f5c\u4e3a\u5f02\u6b65\u51fd\u6570\u7684\u53c2\u6570\u4f20\u9012\u7684\u56de\u8c03\u51fd\u6570\u5c06\u88ab\u53d1\u9001\u5230 Web API \u4e2d\u3002<br \/>\n2. \u5728 Web API \u4e2d\u7b49\u5f85\u7684\u56de\u8c03\u51fd\u6570\u5c06\u5728\u6ee1\u8db3\u6761\u4ef6\u65f6\u6dfb\u52a0\u5230\u4efb\u52a1\u961f\u5217\u4e2d\u3002<\/p>\n<p>\u4e8b\u4ef6\u5faa\u73af\u76d1\u89c6\u7740\u5806\u6808\uff0c\u5982\u679c\u5806\u6808\u4e3a\u7a7a\uff0c\u5219\u4ece\u4efb\u52a1\u961f\u5217\u4e2d\u53d6\u51fa\u3002<\/p>\n<p>\u8fd9\u4e2a\u89c6\u9891\u5f88\u6709\u53c2\u8003\u4ef7\u503c\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u8fd9\u4e2a\u5730\u65b9\u770b\u8d77\u6765\u76f8\u5f53\u6709\u6df1\u5ea6\u7684\u611f\u89c9&#8230;<\/p>\n<p>&nbsp;<\/p>\n<h1>\u8981\u5982\u4f55\u89e3\u51b3\u597d\u5462?<\/h1>\n<p>\u56de\u5230\u672c\u9898\uff0c\u8be5\u5982\u4f55\u5904\u7406reducer\u3002<br \/>\n\u95ee\u9898\u7684\u6839\u6e90\u5728\u4e8e\uff0c\u6211\u4eec\u4f7f\u7528\u4e86 const reducer = (data, newDetails) =&gt; ({ &#8230;data, &#8230;newDetails }) \u8fd9\u6837\u7684\u5199\u6cd5\uff0c\u5bfc\u81f4\u6211\u4eec\u5728\u6df1\u5c42\u6b21\u7684\u5730\u65b9\u8981\u4f7f\u7528reducer\u63d0\u4f9b\u7684\u53d8\u91cf\uff0c\u4f46\u5728React\u7684\u673a\u5236\u4e0a\uff0c\u5374\u65e0\u6cd5\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<p>\u770b\u770b\u516c\u5f0f\u7684\u4f8b\u5b50\uff0c\u4f7f\u7528\u4e86type\u4f5c\u4e3a\u53c2\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"kd\">function<\/span> <span class=\"nf\">reducer<\/span><span class=\"p\">(<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">action<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"k\">switch <\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">type<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">case<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">incremented_age<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"na\">age<\/span><span class=\"p\">:<\/span> <span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">age<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span>\r\n          <span class=\"p\">};<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"k\">case<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">changed_name<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">nextName<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"na\">age<\/span><span class=\"p\">:<\/span> <span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">age<\/span>\r\n          <span class=\"p\">};<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"p\">}<\/span>\r\n      <span class=\"k\">throw<\/span> <span class=\"nc\">Error<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">Unknown action: <\/span><span class=\"dl\">'<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">type<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n<p>\u7136\u540e\u4f60\u9700\u8981\u586b\u5199\u4ee3\u7801\u6765\u8ba1\u7b97\u5e76\u8fd4\u56de\u4e0b\u4e00\u4e2a\u72b6\u6001\u3002\u6309\u7167\u60ef\u4f8b\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528switch\u8bed\u53e5\u6765\u7f16\u5199\u3002\u5bf9\u4e8eswitch\u4e2d\u7684\u6bcf\u4e2a\u60c5\u51b5\uff0c\u8ba1\u7b97\u5e76\u8fd4\u56de\u4e00\u4e9b\u4e0b\u4e00\u4e2a\u72b6\u6001\u3002<\/p>\n<p>\u65e2\u7136\u5982\u6b64\uff0c\u6211\u4eec\u5c31\u5766\u7387\u5730\u4f7f\u7528switch\u5427\uff01<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"c1\">\/\/ action = {paramsName: hoge, payload: fuga } <\/span>\r\n\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">reducer<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"nx\">action<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">paramsName<\/span> <span class=\"o\">===<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept1_a<\/span><span class=\"dl\">\"<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"na\">dept1_a<\/span><span class=\"p\">:<\/span> <span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">payload<\/span> <span class=\"p\">};<\/span>\r\n        <span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">paramsName<\/span> <span class=\"o\">===<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept1_b<\/span><span class=\"dl\">\"<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"na\">dept1_b<\/span><span class=\"p\">:<\/span> <span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">payload<\/span> <span class=\"p\">};<\/span>\r\n        <span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">paramsName<\/span> <span class=\"o\">===<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept2_d<\/span><span class=\"dl\">\"<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"na\">dept1_c<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"nx\">dept1_c<\/span><span class=\"p\">,<\/span> <span class=\"na\">dept2_d<\/span><span class=\"p\">:<\/span> <span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">payload<\/span> <span class=\"p\">}<\/span> <span class=\"p\">};<\/span>\r\n        <span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">paramsName<\/span> <span class=\"o\">===<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">dept2_e<\/span><span class=\"dl\">\"<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"na\">dept1_c<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">data<\/span><span class=\"p\">.<\/span><span class=\"nx\">dept1_c<\/span><span class=\"p\">,<\/span> <span class=\"na\">dept2_e<\/span><span class=\"p\">:<\/span> <span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">payload<\/span> <span class=\"p\">}<\/span> <span class=\"p\">};<\/span>\r\n        <span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"k\">return<\/span> <span class=\"nx\">data<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u6211\u6b63\u5728\u4f7f\u7528React\u6765\u521b\u5efa\u6211\u7684\u6295\u8d44\u7ec4\u5408\u3002 \u5728\u8868\u5355\u9875\u9762\u4f7f\u7528 useReducer \u7684\u65f6\u5019\uff0c\u6211\u53d1\u73b0\u5bf9\u4e8e\u5177\u6709\u5c42 [&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-38560","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>\u5f53\u6211\u7814\u7a76\u5982\u4f55\u4f7f\u7528 useReducer \u7684\u65f6\u5019\uff0c\u6211\u540c\u65f6\u83b7\u5f97\u4e86\u5173\u4e8e JavaScript \u548c React \u7684\u77e5\u8bc6 - 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\" 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