{"id":6197,"date":"2022-05-22T17:37:43","date_gmt":"2022-05-22T09:37:43","guid":{"rendered":"https:\/\/www.lilichao.com\/?p=6197"},"modified":"2022-05-22T17:37:44","modified_gmt":"2022-05-22T09:37:44","slug":"redux","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=6197","title":{"rendered":"Redux"},"content":{"rendered":"\n

A Predictable State Container for JS Apps<\/p><\/blockquote><\/figure>\n\n\n\n

A Predictable State Container for JS Apps\u662fRedux\u5b98\u65b9\u5bf9\u4e8eRedux\u7684\u63cf\u8ff0\uff0c\u8fd9\u53e5\u8bdd\u53ef\u4ee5\u8fd9\u6837\u7ffb\u8bd1\u201c\u4e00\u4e2a\u4e13\u4e3aJS\u5e94\u7528\u8bbe\u8ba1\u7684\u53ef\u9884\u671f\u7684\u72b6\u6001\u5bb9\u5668\u201d\uff0c\u7b80\u5355\u6765\u8bf4Redux\u662f\u4e00\u4e2a\u53ef\u9884\u6d4b\u7684\u72b6\u6001\u5bb9\u5668\uff0c\u4ec0\u4e48\u73a9\u610f\uff1f\u8fd9\u51e0\u4e2a\u5b57\u5355\u72ec\u62ff\u51fa\u6765\u90fd\u8ba4\u8bc6\uff0c\u8fde\u5230\u4e00\u8d77\u540e\u600e\u4e48\u5c31\u4e0d\u50cf\u4eba\u8bdd\u4e86\uff1f\u522b\u6025\uff0c\u6211\u4eec\u4e00\u70b9\u4e00\u70b9\u770b\u3002<\/p>\n\n\n\n

\u72b6\u6001\uff08state\uff09<\/h2>\n\n\n\n

state\u76f4\u8bd1\u8fc7\u6765\u5c31\u662f\u72b6\u6001\uff0c\u4f7f\u7528React\u8fd9\u4e48\u4e45\u4e86\uff0c\u5bf9\u4e8estate\u6211\u4eec\u5df2\u7ecf\u662f\u975e\u5e38\u7684\u719f\u6089\u4e86\u3002state\u4e0d\u8fc7\u5c31\u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u4e00\u4e2a\u7528\u6765\u8bb0\u5f55\uff08\u7ec4\u4ef6\uff09\u72b6\u6001\u7684\u53d8\u91cf\u3002\u7ec4\u4ef6\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u72b6\u6001\u503c\u5207\u6362\u4e3a\u4e0d\u540c\u7684\u663e\u793a\uff0c\u6bd4\u5982\uff0c\u7528\u6237\u767b\u5f55\u548c\u6ca1\u767b\u5f55\u770b\u5230\u9875\u9762\u5e94\u8be5\u662f\u4e0d\u540c\u7684\uff0c\u90a3\u4e48\u7528\u6237\u7684\u767b\u5f55\u4e0e\u5426\u5c31\u5e94\u8be5\u662f\u4e00\u4e2a\u72b6\u6001\u3002\u518d\u6bd4\u5982\uff0c\u6570\u636e\u52a0\u8f7d\u4e0e\u5426\uff0c\u663e\u793a\u7684\u754c\u9762\u4e5f\u5e94\u8be5\u4e0d\u540c\uff0c\u90a3\u4e48\u6570\u636e\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u72b6\u6001\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u72b6\u6001\u63a7\u5236\u4e86\u9875\u9762\u7684\u5982\u4f55\u663e\u793a\u3002<\/p>\n\n\n\n

\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u72b6\u6001\u5e76\u4e0d\u662fReact\u4e2d\u6216\u5176\u4ed6\u7c7b\u4f3c\u6846\u67b6\u4e2d\u72ec\u6709\u7684\u3002\u6240\u6709\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u90fd\u6709\u72b6\u6001\uff0c\u6240\u6709\u7684\u7f16\u7a0b\u8bed\u8a00\u90fd\u4f1a\u6839\u636e\u4e0d\u540c\u7684\u72b6\u6001\u53bb\u6267\u884c\u4e0d\u540c\u7684\u903b\u8f91\uff0c\u8fd9\u662f\u4e00\u5b9a\u7684\u3002\u6240\u4ee5\u72b6\u6001\u662f\u4ec0\u4e48\uff0c\u72b6\u6001\u5c31\u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u7528\u4ee5\u8bb0\u5f55\u7a0b\u5e8f\u6267\u884c\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n

\u5bb9\u5668\uff08container\uff09<\/h2>\n\n\n\n

\u5bb9\u5668\u5f53\u7136\u662f\u7528\u6765\u88c5\u4e1c\u897f\u7684\uff0c\u72b6\u6001\u5bb9\u5668\u5373\u7528\u6765\u5b58\u50a8\u72b6\u6001\u7684\u5bb9\u5668\u3002\u72b6\u6001\u591a\u4e86\uff0c\u81ea\u7136\u9700\u8981\u4e00\u4e2a\u4e1c\u897f\u6765\u5b58\u50a8\uff0c\u4f46\u662f\u5bb9\u5668\u7684\u529f\u80fd\u5374\u4e0d\u662f\u4ec5\u4ec5\u80fd\u5b58\u50a8\u72b6\u6001\uff0c\u5b83\u5b9e\u5219\u662f\u4e00\u4e2a\u72b6\u6001\u7684\u7ba1\u7406\u5668\uff0c\u9664\u4e86\u5b58\u50a8\u72b6\u6001\u5916\uff0c\u5b83\u8fd8\u53ef\u4ee5\u7528\u6765\u5bf9state\u8fdb\u884c\u67e5\u8be2\u3001\u4fee\u6539\u7b49\u6240\u6709\u64cd\u4f5c\u3002\uff08\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5bb9\u5668\u51e0\u4e4e\u90fd\u662f\u8fd9\u4e2a\u610f\u601d\uff0c\u5176\u4f5c\u7528\u65e0\u975e\u5c31\u662f\u5bf9\u67d0\u4e2a\u4e1c\u897f\u8fdb\u884c\u589e\u5220\u6539\u67e5\uff09<\/p>\n\n\n\n

\u53ef\u9884\u6d4b\uff08predictable\uff09<\/h2>\n\n\n\n

\u53ef\u9884\u6d4b\u6307\u6211\u4eec\u5728\u5bf9state\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\u65f6\uff0c\u5176\u7ed3\u679c\u662f\u4e00\u5b9a\u7684\u3002\u5373\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u5bf9state\u6267\u884c\u76f8\u540c\u7684\u64cd\u4f5c\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u7ed3\u679c\u3002\u7b80\u5355\u6765\u8bf4\uff0cRedux\u4e2d\u5bf9\u72b6\u6001\u6240\u6709\u7684\u64cd\u4f5c\u90fd\u5c01\u88c5\u5230\u4e86\u5bb9\u5668\u5185\u90e8\uff0c\u5916\u90e8\u53ea\u80fd\u901a\u8fc7\u8c03\u7528\u5bb9\u5668\u63d0\u4f9b\u7684\u65b9\u6cd5\u6765\u64cd\u4f5cstate\uff0c\u800c\u4e0d\u80fd\u76f4\u63a5\u4fee\u6539state\u3002\u8fd9\u5c31\u610f\u5473\u7740\u5916\u90e8\u5bf9state\u7684\u64cd\u4f5c\u90fd\u88ab\u5bb9\u5668\u6240\u9650\u5236\uff0c\u5bf9state\u7684\u64cd\u4f5c\u90fd\u5728\u5bb9\u5668\u7684\u638c\u63a7\u4e4b\u4e2d\uff0c\u4e5f\u5c31\u662f\u53ef\u9884\u6d4b\u3002<\/p>\n\n\n\n

\u603b\u7684\u6765\u8bf4\uff0cRedux\u662f\u4e00\u4e2a\u7a33\u5b9a\u3001\u5b89\u5168\u7684\u72b6\u6001\u7ba1\u7406\u5668<\/strong>\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4e3a\u4ec0\u4e48\u662fRedux\uff1f<\/h2>\n\n\n\n

\u95ee\uff1a\u4e0d\u5bf9\u554a\uff1fReact\u4e2d\u4e0d\u662f\u5df2\u7ecf\u6709state\u4e86\u5417\uff1f\u4e3a\u4ec0\u4e48\u8fd8\u8981\u6574\u51fa\u4e00\u4e2aRedux\u6765\u4f5c\u4e3a\u72b6\u6001\u7ba1\u7406\u5668\u5462\uff1f<\/p>\n\n\n\n

\u7b54\uff1astate\u5e94\u4ed8\u7b80\u5355\u503c\u8fd8\u53ef\u4ee5\uff0c\u5982\u679c\u503c\u6bd4\u8f83\u590d\u6742\u7684\u8bdd\u5e76\u4e0d\u662f\u5f88\u65b9\u4fbf\u3002<\/p>\n\n\n\n

\u95ee\uff1a\u590d\u6742\u503c\u53ef\u4ee5\u7528useReducer\u561b\uff01<\/p>\n\n\n\n

\u7b54\uff1a\u7684\u786e\u53ef\u4ee5\u554a\uff01\u4f46\u65e0\u8bba\u662fstate\u8fd8\u662fuseReducer\uff0cstate\u5728\u4f20\u9012\u8d77\u6765\u8fd8\u662f\u4e0d\u65b9\u4fbf\uff0c\u81ea\u4e0a\u81f3\u4e0b\u4e00\u5c42\u4e00\u5c42\u7684\u4f20\u9012\u5e76\u4e0d\u65b9\u4fbf\u554a\uff01<\/p>\n\n\n\n

\u95ee\uff1a\u90a3\u4e0d\u662f\u8fd8\u6709context\u5417\uff1f<\/p>\n\n\n\n

\u7b54\uff1a\u7684\u786e\u4f7f\u7528context\u53ef\u4ee5\u89e3\u51b3state\u7684\u4f20\u9012\u7684\u95ee\u9898\uff0c\u4f46\u4f9d\u7136\u662f\u7b80\u5355\u7684\u6570\u636e\u5c1a\u53ef\uff0c\u5982\u679c\u6570\u636e\u7ed3\u6784\u8fc7\u4e8e\u590d\u6742\u4f1a\u4f7f\u5f97context\u53d8\u5f97\u5f02\u5e38\u7684\u5e9e\u5927\uff0c\u4e0d\u65b9\u4fbf\u7ef4\u62a4\u3002<\/p>\n\n\n\n

Redux\u53ef\u4ee5\u7406\u89e3\u4e3a\u662freducer\u548ccontext\u7684\u7ed3\u5408\u4f53\uff0c\u4f7f\u7528Redux\u5373\u53ef\u7ba1\u7406\u590d\u6742\u7684state\uff0c\u53c8\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u7ec4\u4ef6\u95f4\u65b9\u4fbf\u7684\u5171\u4eab\u4f20\u9012state\u3002\u5f53\u7136\uff0cRedux\u4e3b\u8981\u4f7f\u7528\u573a\u666f\u4f9d\u7136\u662f\u5927\u578b\u5e94\u7528\uff0c\u5927\u578b\u5e94\u7528\u4e2d\u72b6\u6001\u6bd4\u8f83\u590d\u6742\uff0c\u5982\u679c\u53ea\u662f\u4f7f\u7528reducer\u548ccontext\uff0c\u5f00\u53d1\u8d77\u6765\u5e76\u4e0d\u662f\u90a3\u4e48\u7684\u4fbf\u5229\uff0c\u6b64\u65f6\u4e00\u4e2a\u6709\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684\u72b6\u6001\u7ba1\u7406\u5668\u5c31\u53d8\u5f97\u5c24\u4e3a\u7684\u91cd\u8981\u3002<\/p>\n\n\n\n

\u4f7f\u7528<\/h2>\n\n\n\n

\u4f7f\u7528Redux\u4e4b\u524d\uff0c\u4f60\u9700\u8981\u5148\u660e\u786e\u4e00\u70b9Redux\u662fJS\u5e94\u7528\u7684\u72b6\u6001\u5bb9\u5668\uff0c\u5b83\u5e76\u4e0d\u662f\u53ea\u80fd\u5728React\u4f7f\u7528\uff0c\u800c\u662f\u53ef\u4ee5\u5e94\u7528\u5230\u4efb\u610f\u7684JS\u5e94\u7528\u4e2d\uff08\u5305\u62ec\u524d\u7aefJS\uff0c\u548c\u670d\u52a1\u5668\u4e2dNode.js\uff09\u3002\u603b\u4e4b\uff0c\u51e1\u662fJS\u4e2d\u9700\u8981\u7ba1\u7406\u7684\u72b6\u6001\u7684Redux\u90fd\u53ef\u4ee5\u80dc\u4efb\u3002<\/p>\n\n\n\n

\u5728\u7f51\u9875\u4e2d\u76f4\u63a5\u4f7f\u7528<\/h3>\n\n\n\n

\u6211\u4eec\u5148\u6765\u5728\u7f51\u9875\u4e2d\u4f7f\u7528\u4ee5\u4e0bRedux\uff0c\u5728\u7f51\u9875\u4e2d\u4f7f\u7528Redux\u5c31\u50cf\u4f7f\u7528jQuery\u4f3c\u7684\uff0c\u76f4\u63a5\u5728\u7f51\u9875\u4e2d\u5f15\u5165Redux\u7684\u5e93\u6587\u4ef6\u5373\u53ef\uff1a<\/p>\n\n\n\n

<script src=\"https:\/\/unpkg.com\/redux@4.2.0\/dist\/redux.js\"><\/script><\/pre>\n\n\n\n
\u7f51\u9875\u4e2d\u6211\u4eec\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u8ba1\u6570\u5668\u529f\u80fd\uff0c\u9875\u9762\u957f\u6210\u8fd9\u6837\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4ee3\u7801\u8fd9\u6837\uff1a<\/p>\n\n\n\n
<button id=\"btn01\">\u51cf\u5c11<\/button>\n<span id=\"counter\">1<\/span>\n<button id=\"btn02\">\u589e\u52a0<\/button><\/pre>\n\n\n\n
\u6211\u4eec\u8981\u5b9e\u73b0\u7684\u529f\u80fd\u5f88\u7b80\u5355\uff0c\u70b9\u51fb\u51cf\u5c11\u6570\u5b57\u53d8\u5c0f\uff0c\u70b9\u51fb\u589e\u52a0\u6570\u5b57\u53d8\u5927\u3002\u5982\u679c\u7528\u4f20\u7edf\u7684DOM\u7f16\u5199\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u53d8\u91cf\u7528\u4ee5\u8bb0\u5f55\u6570\u91cf\uff0c\u70b9\u51fb\u4e0d\u540c\u7684\u6309\u94ae\u5bf9\u53d8\u91cf\u505a\u4e0d\u540c\u7684\u4fee\u6539\u5e76\u8bbe\u7f6e\u5230span\u4e4b\u4e2d\uff0c\u4ee3\u7801\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n
\u4e0d\u4f7f\u7528Redux\uff1a<\/p>\n\n\n\n
const btn01 = document.getElementById('btn01');
const btn02 = document.getElementById('btn02');
const counterSpan = document.getElementById('counter');

let count = 1;

btn01.addEventListener('click', ()=>{
   count--;
   counterSpan.innerText = count;
});

btn02.addEventListener('click', ()=>{
   count++;
   counterSpan.innerText = count;
});<\/pre>\n\n\n\n
\u4e0a\u8ff0\u4ee3\u7801\u4e2dcount\u5c31\u662f\u4e00\u4e2a\u72b6\u6001\uff0c\u53ea\u662f\u8fd9\u4e2a\u72b6\u6001\u6ca1\u6709\u4e13\u95e8\u7684\u7ba1\u7406\u5668\uff0c\u5b83\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u5728\u4e8b\u4ef6\u7684\u54cd\u5e94\u51fd\u6570\u4e2d\u8fdb\u884c\u5904\u7406\uff0c\u8fd9\u79cd\u72b6\u6001\u5c31\u662f\u4e0d\u53ef\u9884\u6d4b\u7684\u72b6\u6001\uff0c\u56e0\u4e3a\u5728\u4efb\u4f55\u7684\u51fd\u6570\u4e2d\u90fd\u53ef\u4ee5\u5bf9\u8fd9\u4e2a\u72b6\u6001\u8fdb\u884c\u4fee\u6539\uff0c\u6ca1\u6709\u4efb\u4f55\u5b89\u5168\u9650\u5236\u3002\u4e0d\u8fc7\u5c31\u8fd9\u4e2a\u529f\u80fd\u800c\u8a00\uff0c\u8fd9\u53ef\u80fd\u5df2\u7ecf\u662f\u6700\u7b80\u5355\u7684\u4ee3\u7801\u4e86\u3002\u4e00\u4f1a\u6211\u4eec\u4f7f\u7528\u4e86Redux\uff0c\u4ee3\u7801\u4f1a\u53d8\u5f97\u590d\u6742\u4e00\u4e9b\uff0c\u4f46\u662f\u8fd8\u662f\u90a3\u53e5\u8bdd\uff0c\u8fd9\u91cc\u6211\u4eec\u53ea\u662f\u627e\u4e00\u4e2a\u7b80\u5355\u7684\u573a\u666f\u505a\u4e00\u4e2a\u6f14\u793a\uff0cRedux\u7684\u771f\u5b9e\u4f7f\u7528\u573a\u666f\u4f9d\u7136\u662f\u5927\u578b\u5e94\u7528\u4e2d\u7684\u590d\u6742state\u3002<\/p>\n\n\n\n
Redux\u662f\u4e00\u4e2a\u72b6\u6001\u5bb9\u5668\uff0c\u6240\u4ee5\u4f7f\u7528Redux\u5fc5\u987b\u5148\u521b\u5efa\u5bb9\u5668\u5bf9\u8c61\uff0c\u5b83\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u662f\u901a\u8fc7\u5bb9\u5668\u5bf9\u8c61\u6765\u8fdb\u884c\u7684\uff0c\u521b\u5efa\u5bb9\u5668\u7684\u65b9\u5f0f\u6709\u591a\u79cd\uff0c\u6211\u4eec\u5148\u8bf4\u4e00\u79cd\u597d\u7406\u89e3\u7684\uff1a<\/p>\n\n\n\n
Redux.createStore(reducer, [preloadedState], [enhancer])<\/code><\/pre>\n\n\n\n
createStore\u7528\u6765\u521b\u5efa\u4e00\u4e2aRedux\u4e2d\u7684\u5bb9\u5668\u5bf9\u8c61\uff0c\u5b83\u9700\u8981\u4e09\u4e2a\u53c2\u6570\uff1areducer\u3001preloadedState\u3001enhancer\u3002<\/p>\n\n\n\n
reducer\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u662fstate\u64cd\u4f5c\u7684\u6574\u5408\u51fd\u6570\uff0c\u6bcf\u6b21\u4fee\u6539state\u65f6\u90fd\u4f1a\u89e6\u53d1\u8be5\u51fd\u6570\uff0c\u5b83\u7684\u8fd4\u56de\u503c\u4f1a\u6210\u4e3a\u65b0\u7684state\u3002<\/p>\n\n\n\n
preloadedState\u5c31\u662fstate\u7684\u521d\u59cb\u503c\uff0c\u53ef\u4ee5\u5728\u8fd9\u91cc\u6307\u5b9a\u4e5f\u53ef\u4ee5\u5728reducer\u4e2d\u6307\u5b9a\u3002<\/p>\n\n\n\n
enhancer\u589e\u5f3a\u51fd\u6570\u7528\u6765\u5bf9state\u7684\u529f\u80fd\u8fdb\u884c\u6269\u5c55\uff0c\u6682\u65f6\u5148\u4e0d\u7406\u5b83\u3002<\/p>\n\n\n\n
\u4e09\u4e2a\u53c2\u6570\u4e2d\uff0c\u53ea\u6709reducer\u662f\u5fc5\u987b\u7684\uff0c\u6765\u770b\u4e00\u4e2aReducer\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n
const countReducer <\/em>= (state = {count:0}, action) => {\n    switch (action.type){\n        case 'ADD':\n            return {count:state.count+1};\n        case 'SUB':\n            return {count:state.count-1};\n        default:\n            return state\n    }\n};<\/pre>\n\n\n\n
reducer\u7528\u6765\u6574\u5408\u5173\u4e8estate\u7684\u6240\u6709\u64cd\u4f5c\uff0c\u5bb9\u5668\u4fee\u6539state\u65f6\u4f1a\u81ea\u52a8\u8c03\u7528\u8be5\u51fd\u6570\uff0c\u51fd\u6570\u8c03\u7528\u65f6\u4f1a\u63a5\u6536\u5230\u4e24\u4e2a\u53c2\u6570\uff1astate\u548caction\uff0cstate\u8868\u793a\u5f53\u524d\u7684state\uff0c\u53ef\u4ee5\u901a\u8fc7\u8be5state\u6765\u8ba1\u7b97\u65b0\u7684state\u3002state = {count:0}<\/code>\u8fd9\u662f\u5728\u6307\u5b9astate\u7684\u9ed8\u8ba4\u503c\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\uff0c\u7b2c\u4e00\u6b21\u8c03\u7528\u65f6state\u7684\u503c\u4f1a\u662fundefined\u3002\u4e5f\u53ef\u4ee5\u5c06\u8be5\u503c\u6307\u5b9a\u4e3acreateStore()\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002action\u662f\u4e00\u4e2a\u666e\u901a\u5bf9\u8c61\uff0c\u7528\u6765\u5b58\u50a8\u64cd\u4f5c\u4fe1\u606f\u3002<\/p>\n\n\n\n
\u5c06reducer\u4f20\u9012\u8fdbcreateStore\u540e\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u4e00\u4e2astore\u5bf9\u8c61\uff1a<\/p>\n\n\n\n
const store = Redux.createStore(countReducer<\/em>);<\/pre>\n\n\n\n
store\u5bf9\u8c61\u521b\u5efa\u540e\uff0c\u5bf9state\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u9700\u8981\u901a\u8fc7\u5b83\u6765\u8fdb\u884c\uff1a<\/p>\n\n\n\n
\u8bfb\u53d6state\uff1a<\/p>\n\n\n\n
store.getState()<\/pre>\n\n\n\n
\u4fee\u6539state\uff1a<\/p>\n\n\n\n
store.dispatch({type:'ADD'})<\/pre>\n\n\n\n
dipatch\u7528\u6765\u89e6\u53d1state\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5c06\u5176\u7406\u89e3\u4e3a\u662f\u60f3reducer\u53d1\u9001\u4efb\u52a1\u7684\u5de5\u5177\u3002\u5b83\u9700\u8981\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c06\u4f1a\u6210\u4e3areducer\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570action\uff0c\u9700\u8981\u5c06\u64cd\u4f5c\u4fe1\u606f\u8bbe\u7f6e\u5230\u5bf9\u8c61\u4e2d\u4f20\u9012\u7ed9reducer\u3002action\u4e2d\u6700\u91cd\u8981\u7684\u5c5e\u6027\u662ftype\uff0ctype\u7528\u6765\u8bc6\u522b\u5bf9state\u7684\u4e0d\u540c\u7684\u64cd\u4f5c\uff0c\u4e0a\u4f8b\u4e2d’ADD’\u8868\u793a\u589e\u52a0\u64cd\u4f5c\uff0c’SUB’\u8868\u793a\u51cf\u5c11\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n
\u9664\u4e86\u8fd9\u4e9b\u65b9\u6cd5\u5916\uff0cstore\u8fd8\u62e5\u6709\u4e00\u4e2asubscribe\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7528\u6765\u8ba2\u9605state\u53d8\u5316\u7684\u4fe1\u606f\u3002\u8be5\u65b9\u6cd5\u9700\u8981\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u5f53store\u4e2d\u5b58\u50a8\u7684state\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u56de\u8c03\u51fd\u6570\u4f1a\u81ea\u52a8\u8c03\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u5b9a\u4e49state\u53d1\u751f\u53d8\u5316\u65f6\u6240\u8981\u89e6\u53d1\u7684\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
store.subscribe(()=>{\n    \/\/ store\u4e2dstate\u53d1\u751f\u53d8\u5316\u65f6\u89e6\u53d1\n});<\/pre>\n\n\n\n
\u5982\u6b64\u4e00\u6765\uff0c\u521a\u521a\u7684\u4ee3\u7801\u88ab\u4fee\u6539\u6210\u4e86\u8fd9\u4e2a\u6837\u5b50\uff1a<\/p>\n\n\n\n
const btn01 = document.getElementById('btn01');
const btn02 = document.getElementById('btn02');
const counterSpan = document.getElementById('counter');


const countReducer <\/em>= (state = {count:0}, action) => {
    switch (action.type){
        case 'ADD':
            return {count:state.count+1};
        case 'SUB':
            return {count:state.count-1};
        default:
            return state
    }
};

const store = Redux.createStore(countReducer<\/em>);

store.subscribe(()=>{
    counterSpan.innerText = store.getState().count;
});

btn01.addEventListener('click', ()=>{
    store.dispatch({type:'SUB'});
});

btn02.addEventListener('click', ()=>{
    store.dispatch({type:'ADD'});
});<\/pre>\n\n\n\n
\u4fee\u6539\u540e\u7684\u4ee3\u7801\u76f8\u8f83\u4e8e\u7b2c\u4e00\u4e2a\u7248\u672c\u8981\u590d\u6742\u4e00\u4e9b\uff0c\u540c\u65f6\u4e5f\u89e3\u51b3\u4e86\u4e4b\u524d\u4ee3\u7801\u4e2d\u5b58\u5728\u7684\u4e00\u4e9b\u95ee\u9898\uff1a<\/p>\n\n\n\n
  1. \u524d\u4e00\u4e2a\u7248\u672c\u7684\u4ee3\u7801state\u5c31\u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u53ef\u4ee5\u4efb\u610f\u88ab\u4fee\u6539\u3002state\u4e0d\u53ef\u9884\u6d4b\uff0c\u5bb9\u6613\u88ab\u4fee\u6539\u4e3a\u9519\u8bef\u7684\u503c\u3002\u65b0\u4ee3\u7801\u4e2d\u4f7f\u7528\u4e86Redux\uff0cRedux\u4e2d\u7684\u5bf9state\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u5c01\u88c5\u5230\u4e86reducer\u51fd\u6570\u4e2d\uff0c\u53ef\u4ee5\u9650\u5236state\u7684\u4fee\u6539\u4f7fstate\u53ef\u9884\u6d4b\uff0c\u6709\u6548\u7684\u907f\u514d\u4e86\u9519\u8bef\u7684state\u503c\u3002<\/li>
  2. \u524d\u4e00\u4e2a\u7248\u672c\u7684\u4ee3\u7801\uff0c\u6bcf\u6b21\u70b9\u51fb\u6309\u94ae\u4fee\u6539state\uff0c\u5c31\u8981\u624b\u52a8\u7684\u4fee\u6539counterSpan\u7684innerText\uff0c\u975e\u5e38\u9ebb\u70e6\uff0c\u8fd9\u6837\u4e00\u6765\u6211\u4eec\u5982\u679c\u518d\u6dfb\u52a0\u65b0\u7684\u529f\u80fd\uff0c\u4f9d\u7136\u4e0d\u80fd\u5fd8\u8bb0\u5bf9\u5176\u8fdb\u884c\u4fee\u6539\u3002\u65b0\u4ee3\u7801\u4e2d\uff0ccounterSpan\u7684\u4fee\u6539\u662f\u5728store.subscribe()\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u8fdb\u884c\u7684\uff0cstate\u6bcf\u6b21\u53d1\u751f\u53d8\u5316\u5176\u503c\u5c31\u4f1a\u968f\u4e4b\u53d8\u5316\uff0c\u4e0d\u9700\u8981\u518d\u624b\u52a8\u4fee\u6539\u3002\u6362\u53e5\u8bdd\u8bf4\uff0cstate\u548cDOM\u5143\u7d20\u901a\u8fc7Redux\u7ed1\u5b9a\u5230\u4e86\u4e00\u8d77\u3002<\/li><\/ol>\n\n\n\n
    \u901a\u8fc7\u4e0a\u4f8b\u4e5f\u4e0d\u96be\u770b\u51fa\uff0cRedux\u4e2d\u6700\u6700\u6838\u5fc3\u7684\u4e1c\u897f\u5c31\u662f\u8fd9\u4e2astore\uff0c\u53ea\u8981\u62ff\u5230\u4e86\u8fd9\u4e2astore\u5bf9\u8c61\u5c31\u76f8\u5f53\u4e8e\u62ff\u5230\u4e86Redux\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u3002\u5728\u52a0\u4e0aRedux\u7684\u6838\u5fc3\u601d\u60f3\u4e2d\u6709\u4e00\u6761\u53eb\u505a\u201c\u5355\u4e00\u6570\u636e\u6e90\u201d\uff0c\u4e5f\u5c31\u662f\u6240\u6709\u7684state\u90fd\u4f1a\u5b58\u50a8\u5230\u4e00\u8bfe\u5bf9\u8c61\u6811\u4e2d\uff0c\u5e76\u4e14\u8fd9\u4e2a\u5bf9\u8c61\u6811\u4f1a\u5b58\u50a8\u5230\u4e00\u4e2astore\u4e2d\u3002\u6240\u4ee5\u5230\u4e86React\u4e2d\uff0c\u7ec4\u4ef6\u53ea\u9700\u83b7\u53d6\u5230store\u5373\u53ef\u83b7\u53d6\u5230Redux\u4e2d\u5b58\u50a8\u7684\u6240\u6709state\u3002<\/p>\n\n\n\n
    React\u4e2d\u4f7f\u7528Redux\uff08\u65e7\u7684\u65b9\u5f0f\uff09<\/h2>\n\n\n\n
    \u5f53\u6211\u4eec\u9700\u8981\u5728React\u4e2d\u4f7f\u7528Redux\u65f6\uff0c\u6211\u4eec\u9664\u4e86\u9700\u8981\u5f15\u5165Redux\u6838\u5fc3\u5e93\u5916\uff0c\u8fd8\u9700\u8981\u5f15\u5165react-redux\u5e93\uff0c\u4ee5\u4f7fReact\u548credux\u9002\u914d\uff0c\u53ef\u4ee5\u901a\u8fc7npm\u6216yarn\u5b89\u88c5\uff1a<\/p>\n\n\n\n
    npm install -S redux react-redux<\/code><\/pre>\n\n\n\n
    \u6216<\/p>\n\n\n\n
    yarn add redux react-redux<\/p>\n\n\n\n
    \u63a5\u4e0b\u6765\u6211\u4eec\u5c1d\u8bd5\u5728Redux\uff0c\u6dfb\u52a0\u4e00\u4e9b\u590d\u6742\u7684state\uff0c\u6bd4\u5982\u4e00\u4e2a\u5b66\u751f\u7684\u4fe1\u606f\uff1a<\/p>\n\n\n\n
    {name:'\u5b59\u609f\u7a7a', age:18, gender:'\u7537', address:'\u82b1\u679c\u5c71'}<\/code><\/pre>\n\n\n\n
    \u4ee3\u7801\uff1a<\/p>\n\n\n\n
    \u521b\u5efareducer\uff1a<\/p>\n\n\n\n
    const reducer = (state = {\n    name: '\u5b59\u609f\u7a7a',\n    age: 18,\n    gender: '\u7537',\n    address: '\u82b1\u679c\u5c71'\n}, action) => {\n    switch (action.type) {\n        case 'SET_NAME':\n            return {\n                ...state,\n                name: action.payload\n            };\n        case 'SET_AGE':\n            return {\n                ...state,\n                age: action.payload\n            };\n        case 'SET_ADDRESS':\n            return {\n                ...state,\n                address: action.payload\n            };\n        case 'SET_GENDER':\n            return {\n                ...state,\n                gender: action.payload\n            };\n        default :\n            return state\n    }\n\n};<\/pre>\n\n\n\n
    reducer\u7684\u7f16\u5199\u548c\u4e4b\u524d\u7684\u6848\u4f8b\u5e76\u6ca1\u6709\u672c\u8d28\u7684\u533a\u522b\uff0c\u53ea\u662f\u8fd9\u6b21\u7684\u6570\u636e\u548c\u64cd\u4f5c\u65b9\u6cd5\u53d8\u5f97\u590d\u6742\u4e86\u4e00\u4e9b\u3002\u4ee5SET_NAME\u4e3a\u4f8b\uff0c\u5f53\u9700\u8981\u4fee\u6539name\u5c5e\u6027\u65f6\uff0cdispatch\u9700\u8981\u4f20\u9012\u4e00\u4e2a\u6709\u4e24\u4e2a\u5c5e\u6027\u7684action\uff0caction\u7684type\u5e94\u8be5\u662f\u5b57\u7b26\u4e32”SET_NAME”\uff0cpayload\u5e94\u8be5\u662f\u8981\u4fee\u6539\u7684\u65b0\u540d\u5b57\uff0c\u6bd4\u5982\u8981\u5c06\u540d\u5b57\u4fee\u6539\u4e3a\u732a\u516b\u6212\uff0c\u5219dispatch\u9700\u8981\u4f20\u9012\u8fd9\u6837\u4e00\u4e2a\u5bf9\u8c61{type:'SET_NAME',payload:'\u732a\u516b\u6212'}<\/code>\u3002<\/p>\n\n\n\n
    \u521b\u5efastore\uff1a<\/p>\n\n\n\n
    const store = createStore<\/em>(reducer);<\/pre>\n\n\n\n
    \u521b\u5efastore\u548c\u524d\u4f8b\u5e76\u65e0\u5dee\u5f02\uff0c\u4f20\u9012reducer\u8fdb\u884c\u6784\u5efa\u5373\u53ef\u3002<\/p>\n\n\n\n
    \u8bbe\u7f6eprovider\uff1a<\/p>\n\n\n\n
    const root = ReactDOM.createRoot<\/em>(document.getElementById('root'));
    root.render(
        <Provider store={store}>
            <App\/>
        <\/Provider>
    );<\/pre>\n\n\n\n
    \u521b\u5efastore\u540e\uff0c\u9700\u8981\u5f15\u5165react-redux\u4e2d\u63d0\u4f9b\u7684Provider\u7ec4\u4ef6\uff0c\u5c06\u5176\u8bbe\u7f6e\u5230\u6240\u6709\u7ec4\u4ef6\u7684\u6700\u5916\u5c42\uff0c\u5e76\u4e14\u5c06\u521a\u521a\u521b\u5efa\u7684store\u8bbe\u7f6e\u4e3a\u7ec4\u4ef6\u7684store\u5c5e\u6027\uff0c\u53ea\u6709\u8fd9\u6837\u624d\u80fd\u4f7f\u5f97Redux\u4e2d\u7684\u6570\u636e\u80fd\u88ab\u6240\u6709\u7684\u7ec4\u4ef6\u8bbf\u95ee\u5230\u3002<\/p>\n\n\n\n
    \u8bbf\u95ee\u6570\u636e\uff1a<\/p>\n\n\n\n
    const stu = useSelector<\/em>(state => state);<\/pre>\n\n\n\n
    react-redux\u8fd8\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e00\u4e2a\u94a9\u5b50\u51fd\u6570useSelector\uff0c\u7528\u4e8e\u83b7\u53d6Redux\u4e2d\u5b58\u50a8\u7684\u6570\u636e\uff0c\u5b83\u9700\u8981\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u56de\u8c03\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u5c31\u662f\u5f53\u524d\u7684state\uff0c\u56de\u8c03\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u4f1a\u4f5c\u4e3auseSelector\u7684\u8fd4\u56de\u503c\u8fd4\u56de\uff0c\u6240\u4ee5state => state<\/code>\u8868\u793a\u76f4\u63a5\u5c06\u6574\u4e2astate\u4f5c\u4e3a\u8fd4\u56de\u503c\u8fd4\u56de\u3002\u73b0\u5728\u5c31\u53ef\u4ee5\u901a\u8fc7stu\u6765\u8bfb\u53d6state\u4e2d\u7684\u6570\u636e\u4e86\uff1a<\/p>\n\n\n\n
    <p>
        {stu.name} -- {stu.age} -- {stu.gender} -- {stu.address}
    <\/p><\/pre>\n\n\n\n
    \u64cd\u4f5c\u6570\u636e\uff1a<\/p>\n\n\n\n
    const dispatch = useDispatch<\/em>();<\/pre>\n\n\n\n
    useDispatch\u540c\u6837\u662freact-redux\u63d0\u4f9b\u7684\u94a9\u5b50\u51fd\u6570\uff0c\u7528\u6765\u83b7\u53d6redux\u7684\u6d3e\u53d1\u5668\uff0c\u5bf9state\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u9700\u8981\u901a\u8fc7\u6d3e\u53d1\u5668\u6765\u8fdb\u884c\u3002<\/p>\n\n\n\n
    \u901a\u8fc7\u6d3e\u53d1\u5668\u4fee\u6539state\uff1a<\/p>\n\n\n\n
    dispatch({type:'SET_NAME', payload:'\u732a\u516b\u6212'})\ndispatch({type:'SET_AGE', payload:28})\ndispatch({type:'SET_GENDER', payload:'\u5973'})\ndispatch({type:'SET_ADDRESS', payload:'\u9ad8\u8001\u5e84'})<\/pre>\n\n\n\n
    \u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n\n\n\n
    import ReactDOM from 'react-dom\/client';\nimport {Provider<\/em>, useDispatch<\/em>, useSelector<\/em>} from \"react-redux\";\nimport {createStore<\/em>} from \"redux\";\n\nconst reducer = (state = {\n    name: '\u5b59\u609f\u7a7a',\n    age: 18,\n    gender: '\u7537',\n    address: '\u82b1\u679c\u5c71'\n}, action) => {\n    switch (action.type) {\n        case 'SET_NAME':\n            return {\n                ...state,\n                name: action.payload\n            };\n        case 'SET_AGE':\n            return {\n                ...state,\n                age: action.payload\n            };\n        case 'SET_ADDRESS':\n            return {\n                ...state,\n                address: action.payload\n            };\n        case 'SET_GENDER':\n            return {\n                ...state,\n                gender: action.payload\n            };\n        default :\n            return state\n    }\n\n};\n\nconst store = createStore<\/em>(reducer);\n\nconst App = () =>{\n    const stu = useSelector<\/em>(state => state);\n    const dispatch = useDispatch<\/em>();\n    return  <div>\n        <p>\n            {stu.name} -- {stu.age} -- {stu.gender} -- {stu.address}\n        <\/p>\n        <div>\n            <button onClick={()=>{dispatch({type:'SET_NAME', payload:'\u732a\u516b\u6212'})}}>\u6539name<\/button>\n            <button onClick={()=>{dispatch({type:'SET_AGE', payload:28})}}>\u6539age<\/button>\n            <button onClick={()=>{dispatch({type:'SET_GENDER', payload:'\u5973'})}}>\u6539gender<\/button>\n            <button onClick={()=>{dispatch({type:'SET_ADDRESS', payload:'\u9ad8\u8001\u5e84'})}}>\u6539address<\/button>\n        <\/div>\n  <\/div>\n};\n\n\n\nconst root = ReactDOM.createRoot<\/em>(document.getElementById('root'));\nroot.render(\n    <div>\n        <Provider store={store}>\n            <App\/>\n        <\/Provider>\n    <\/div>\n\n);<\/pre>\n\n\n\n
    \u590d\u6742\u7684state<\/h2>\n\n\n\n
    \u4e0a\u4f8b\u4e2d\u7684\u6570\u636e\u7ed3\u6784\u5df2\u7ecf\u53d8\u5f97\u590d\u6742\uff0c\u4f46\u662f\u8ddd\u79bb\u771f\u5b9e\u9879\u76ee\u8fd8\u6709\u4e00\u5b9a\u7684\u5dee\u8ddd\u3002\u56e0\u4e3aRedux\u7684\u6838\u5fc3\u601d\u60f3\u662f\u6240\u6709\u7684state\u90fd\u5e94\u8be5\u5b58\u50a8\u5230\u540c\u4e00\u4e2a\u4ed3\u5e93\u4e2d\uff0c\u6240\u4ee5\u53ea\u6709\u4e00\u4e2a\u5b66\u751f\u6570\u636e\u786e\u5b9e\u663e\u5f97\u6709\u70b9\u5355\u8584\uff0c\u73b0\u5728\u5c06\u6570\u636e\u53d8\u5f97\u590d\u6742\u4e00\u4e9b\uff0c\u51fa\u6765\u5b66\u751f\u6570\u636e\u5916\uff0c\u8fd8\u589e\u52a0\u4e86\u4e00\u4e2a\u5b66\u6821\u7684\u4fe1\u606f\uff0c\u4e8e\u662fstate\u7684\u7ed3\u6784\u53d8\u6210\u4e86\u8fd9\u6837\uff1a<\/p>\n\n\n\n
    {\n    stu:{\n        name: '\u5b59\u609f\u7a7a',\n        age: 18,\n        gender: '\u7537',\n        address: '\u82b1\u679c\u5c71' \n    },\n    school:{\n        name:'\u82b1\u679c\u5c71\u4e00\u5c0f',\n        address:'\u82b1\u679c\u5c71\u5927\u88571\u53f7'\n    }\n}<\/code><\/pre>\n\n\n\n
    \u6570\u636e\u7ed3\u6784\u53d8\u5f97\u590d\u6742\u4e86\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u4ee3\u7801\u8fdb\u884c\u4fee\u6539\uff0c\u9996\u5148\u770breducer\uff1a<\/p>\n\n\n\n
    const reducer = (state = {\n    stu: {\n        name: '\u5b59\u609f\u7a7a',\n        age: 18,\n        gender: '\u7537',\n        address: '\u82b1\u679c\u5c71'\n    },\n    school: {\n        name: '\u82b1\u679c\u5c71\u4e00\u5c0f',\n        address: '\u82b1\u679c\u5c71\u5927\u88571\u53f7'\n    }\n\n}, action) => {\n    switch (action.type) {\n        case 'SET_NAME':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    name: action.payload\n                }\n            };\n        case 'SET_AGE':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    age: action.payload\n                }\n            };\n        case 'SET_ADDRESS':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    address: action.payload\n                }\n            };\n        case 'SET_GENDER':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    gender: action.payload\n                }\n            };\n        case 'SET_SCHOOL_NAME':\n            return {\n                ...state,\n                school: {\n                    ...state.school,\n                    name:action.payload\n                }\n            };\n        case 'SET_SCHOOL_ADDRESS':\n            return {\n                ...state,\n                school: {\n                    ...state.school,\n                    address: action.payload\n                }\n            }\n        default :\n            return state;\n    }\n\n};<\/pre>\n\n\n\n
    \u6570\u636e\u5c42\u6b21\u53d8\u591a\u4e86\uff0c\u6211\u4eec\u5728\u64cd\u4f5c\u6570\u636e\u65f6\u4e5f\u53d8\u5f97\u590d\u6742\u4e86\uff0c\u6bd4\u5982\u4fee\u6539name\u7684\u903b\u8f91\u53d8\u6210\u4e86\u8fd9\u6837\uff1a<\/p>\n\n\n\n
    case 'SET_NAME':\n    return {\n         ...state,\n        stu: {\n            ...state.stu,\n            name: action.payload\n    }\n};<\/code><\/pre>\n\n\n\n
    \u540c\u65f6\u6570\u636e\u52a0\u8f7d\u7684\u903b\u8f91\u4e5f\u8981\u4fee\u6539\uff0c\u4e4b\u524d\u6211\u4eec\u662f\u5c06\u6574\u4e2astate\u8fd4\u56de\uff0c\u73b0\u5728\u6211\u4eec\u9700\u8981\u6839\u636e\u4e0d\u540c\u60c5\u51b5\u83b7\u53d6state\uff0c\u6bd4\u5982\u83b7\u53d6\u5b66\u751f\u4fe1\u606f\u8981\u8fd9\u4e48\u5199\uff1a<\/p>\n\n\n\n
    const stu = useSelector<\/em>(state => state.stu);<\/pre>\n\n\n\n
    \u83b7\u53d6\u5b66\u6821\u4fe1\u606f\uff1a<\/p>\n\n\n\n
    const school = useSelector<\/em>(state => state.school);<\/pre>\n\n\n\n
    \u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n\n\n\n
    import ReactDOM from 'react-dom\/client';\nimport {Provider<\/em>, useDispatch<\/em>, useSelector<\/em>} from \"react-redux\";\nimport {createStore<\/em>} from \"redux\";\n\nconst reducer = (state = {\n    stu: {\n        name: '\u5b59\u609f\u7a7a',\n        age: 18,\n        gender: '\u7537',\n        address: '\u82b1\u679c\u5c71'\n    },\n    school: {\n        name: '\u82b1\u679c\u5c71\u4e00\u5c0f',\n        address: '\u82b1\u679c\u5c71\u5927\u88571\u53f7'\n    }\n\n}, action) => {\n    switch (action.type) {\n        case 'SET_NAME':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    name: action.payload\n                }\n            };\n        case 'SET_AGE':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    age: action.payload\n                }\n            };\n        case 'SET_ADDRESS':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    address: action.payload\n                }\n            };\n        case 'SET_GENDER':\n            return {\n                ...state,\n                stu: {\n                    ...state.stu,\n                    gender: action.payload\n                }\n            };\n        case 'SET_SCHOOL_NAME':\n            return {\n                ...state,\n                school: {\n                    ...state.school,\n                    name:action.payload\n                }\n            };\n        case 'SET_SCHOOL_ADDRESS':\n            return {\n                ...state,\n                school: {\n                    ...state.school,\n                    address: action.payload\n                }\n            }\n        default :\n            return state;\n    }\n\n};\n\nconst store = createStore<\/em>(reducer);\n\nconst App = () => {\n    const stu = useSelector<\/em>(state => state.stu);\n    const school = useSelector<\/em>(state => state.school);\n    const dispatch = useDispatch<\/em>();\n    return <div>\n        <p>\n            {stu.name} -- {stu.age} -- {stu.gender} -- {stu.address}\n        <\/p>\n        <div>\n            <button onClick={() => {\n                dispatch({type: 'SET_NAME', payload: '\u732a\u516b\u6212'});\n            }}>\u6539name\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_AGE', payload: 28});\n            }}>\u6539age\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_GENDER', payload: '\u5973'});\n            }}>\u6539gender\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_ADDRESS', payload: '\u9ad8\u8001\u5e84'});\n            }}>\u6539address\n            <\/button>\n        <\/div>\n\n        <hr\/>\n\n        <p>\n            {school.name} -- {school.address}\n        <\/p>\n        <div>\n            <button onClick={()=>{dispatch({type:'SET_SCHOOL_NAME', payload:'\u9ad8\u8001\u5e84\u5c0f\u5b66'})}}>\u6539\u5b66\u6821name<\/button>\n            <button onClick={()=>{dispatch({type:'SET_SCHOOL_ADDRESS', payload:'\u9ad8\u8001\u5e84\u4e2d\u5fc3\u5927\u885715\u53f7'})}}>\u6539\u5b66\u6821address<\/button>\n        <\/div>\n    <\/div>;\n};\n\n\nconst root = ReactDOM.createRoot<\/em>(document.getElementById('root'));\nroot.render(\n    <div>\n        <Provider store={store}>\n            <App\/>\n        <\/Provider>\n    <\/div>\n);<\/pre>\n\n\n\n
    \u9ebb\u70e6\u786e\u5b9e\u662f\u9ebb\u70e6\u4e86\u4e00\u4e9b\uff0c\u4f46\u662f\u8fd8\u597d\u529f\u80fd\u5b9e\u73b0\u4e86\u3002<\/p>\n\n\n\n
    \u591a\u4e2aReducer<\/h2>\n\n\n\n
    \u4e0a\u8fb9\u7684\u6848\u4f8b\u7684\u5199\u6cd5\u5b58\u5728\u4e00\u4e2a\u975e\u5e38\u4e25\u91cd\u7684\u95ee\u9898\uff01\u5c06\u6240\u6709\u7684\u4ee3\u7801\u90fd\u5199\u5230\u4e00\u4e2areducer\u4e2d\uff0c\u4f1a\u4f7f\u5f97\u8fd9\u4e2areducer\u53d8\u5f97\u65e0\u6bd4\u5e9e\u5927\uff0c\u73b0\u5728\u53ea\u6709\u5b66\u751f\u548c\u5b66\u6821\u4e24\u4e2a\u4fe1\u606f\u3002\u5982\u679c\u6570\u636e\u5728\u591a\u4e00\u4e9b\uff0c\u64cd\u4f5c\u65b9\u6cd5\u4e5f\u4f1a\u968f\u4e4b\u589e\u591a\uff0creducer\u4f1a\u8d8a\u6765\u8d8a\u5e9e\u5927\u53d8\u5f97\u96be\u4ee5\u7ef4\u62a4\u3002<\/p>\n\n\n\n
    Redux\u4e2d\u662f\u5141\u8bb8\u6211\u4eec\u521b\u5efa\u591a\u4e2areducer\u7684\uff0c\u6240\u4ee5\u4e0a\u4f8b\u4e2d\u7684reducer\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5b83\u7684\u6570\u636e\u548c\u529f\u80fd\u8fdb\u884c\u62c6\u5206\uff0c\u62c6\u5206\u4e3a\u4e24\u4e2areducer\uff0c\u50cf\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n
    const stuReducer = (state = {\n    name: '\u5b59\u609f\u7a7a',\n    age: 18,\n    gender: '\u7537',\n    address: '\u82b1\u679c\u5c71'\n}, action) => {\n    switch (action.type) {\n        case 'SET_NAME':\n            return {\n                ...state,\n                name: action.payload\n            };\n        case 'SET_AGE':\n            return {\n                ...state,\n                age: action.payload\n            };\n        case 'SET_ADDRESS':\n            return {\n                ...state,\n                address: action.payload\n            };\n        case 'SET_GENDER':\n            return {\n                ...state,\n                gender: action.payload\n            };\n        default :\n            return state;\n    }\n\n};\n\nconst schoolReducer = (state = {\n    name: '\u82b1\u679c\u5c71\u4e00\u5c0f',\n    address: '\u82b1\u679c\u5c71\u5927\u88571\u53f7'\n}, action) => {\n    switch (action.type) {\n        case 'SET_SCHOOL_NAME':\n            return {\n                ...state,\n                name: action.payload\n            };\n        case 'SET_SCHOOL_ADDRESS':\n            return {\n                ...state,\n                address: action.payload\n            };\n        default :\n            return state;\n    }\n\n};<\/pre>\n\n\n\n
    \u4fee\u6539\u540ereducer\u88ab\u62c6\u5206\u4e3a\u4e86stuReducer\u548cschoolReducer\uff0c\u62c6\u5206\u540e\u5728\u7f16\u5199\u6bcf\u4e2areducer\u65f6\uff0c\u53ea\u9700\u8981\u8003\u8651\u5f53\u524d\u7684state\u6570\u636e\uff0c\u4e0d\u518d\u9700\u8981\u5bf9\u65e0\u5173\u7684\u6570\u636e\u8fdb\u884c\u590d\u5236\u7b49\u64cd\u4f5c\uff0c\u7b80\u5316\u4e86reducer\u7684\u7f16\u5199\u3002\u4e8e\u6b64\u540c\u65f6\u5c06\u4e0d\u540c\u7684\u529f\u80fd\u7f16\u5199\u5230\u4e86\u4e0d\u540c\u7684reducer\u4e2d\uff0c\u964d\u4f4e\u4e86\u4ee3\u7801\u95f4\u7684\u8026\u5408\uff0c\u65b9\u4fbf\u5bf9\u4ee3\u7801\u8fdb\u884c\u7ef4\u62a4\u3002<\/p>\n\n\n\n
    \u62c6\u5206\u540e\uff0c\u8fd8\u9700\u8981\u4f7f\u7528Redux\u4e3a\u6211\u4eec\u63d0\u4f9b\u7684\u51fd\u6570combineReducer\u5c06\u591a\u4e2areducer\u8fdb\u884c\u5408\u5e76\uff0c\u5408\u5e76\u540e\u624d\u80fd\u4f20\u9012\u8fdbcreateStore\u6765\u521b\u5efastore\u3002<\/p>\n\n\n\n
    const reducer = combineReducers<\/em>({\n    stu:stuReducer,\n    school:schoolReducer\n});\n\nconst store = createStore<\/em>(reducer);<\/pre>\n\n\n\n
    combineReducer\u9700\u8981\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\uff0c\u5bf9\u8c61\u7684\u5c5e\u6027\u540d\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6307\u5b9a\uff0c\u6bd4\u5982\u6211\u4eec\u6709\u4e24\u79cd\u6570\u636estu\u548cschool\uff0c\u5c5e\u6027\u540d\u5c31\u547d\u540d\u4e3astu\u548cschool\uff0cstu\u6307\u5411stuReducer\uff0cschool\u6307\u5411schoolReducer\u3002\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u76f4\u63a5\u901a\u8fc7state.stu\u8bfb\u53d6\u5b66\u751f\u6570\u636e\uff0c\u901a\u8fc7state.school\u8bfb\u53d6\u5b66\u6821\u6570\u636e\u3002<\/p>\n\n\n\n
    \u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n\n\n\n
    import ReactDOM from 'react-dom\/client';\nimport {Provider<\/em>, useDispatch<\/em>, useSelector<\/em>} from \"react-redux\";\nimport {combineReducers<\/em>, createStore<\/em>} from \"redux\";\n\nconst stuReducer = (state = {\n    name: '\u5b59\u609f\u7a7a',\n    age: 18,\n    gender: '\u7537',\n    address: '\u82b1\u679c\u5c71'\n}, action) => {\n    switch (action.type) {\n        case 'SET_NAME':\n            return {\n                ...state,\n                name: action.payload\n            };\n        case 'SET_AGE':\n            return {\n                ...state,\n                age: action.payload\n            };\n        case 'SET_ADDRESS':\n            return {\n                ...state,\n                address: action.payload\n            };\n        case 'SET_GENDER':\n            return {\n                ...state,\n                gender: action.payload\n            };\n        default :\n            return state;\n    }\n\n};\n\nconst schoolReducer = (state = {\n\n    name: '\u82b1\u679c\u5c71\u4e00\u5c0f',\n    address: '\u82b1\u679c\u5c71\u5927\u88571\u53f7'\n\n}, action) => {\n    switch (action.type) {\n        case 'SET_SCHOOL_NAME':\n            return {\n                ...state,\n                name: action.payload\n            };\n        case 'SET_SCHOOL_ADDRESS':\n            return {\n                ...state,\n                address: action.payload\n            };\n        default :\n            return state;\n    }\n\n};\n\nconst reducer = combineReducers<\/em>({\n    stu:stuReducer,\n    school:schoolReducer\n});\n\nconst store = createStore<\/em>(reducer);\n\nconst App = () => {\n    const stu = useSelector<\/em>(state => state.stu);\n    const school = useSelector<\/em>(state => state.school);\n    const dispatch = useDispatch<\/em>();\n    return <div>\n        <p>\n            {stu.name} -- {stu.age} -- {stu.gender} -- {stu.address}\n        <\/p>\n        <div>\n            <button onClick={() => {\n                dispatch({type: 'SET_NAME', payload: '\u732a\u516b\u6212'});\n            }}>\u6539name\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_AGE', payload: 28});\n            }}>\u6539age\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_GENDER', payload: '\u5973'});\n            }}>\u6539gender\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_ADDRESS', payload: '\u9ad8\u8001\u5e84'});\n            }}>\u6539address\n            <\/button>\n        <\/div>\n\n        <hr\/>\n\n        <p>\n            {school.name} -- {school.address}\n        <\/p>\n        <div>\n            <button onClick={() => {\n                dispatch({type: 'SET_SCHOOL_NAME', payload: '\u9ad8\u8001\u5e84\u5c0f\u5b66'});\n            }}>\u6539\u5b66\u6821name\n            <\/button>\n            <button onClick={() => {\n                dispatch({type: 'SET_SCHOOL_ADDRESS', payload: '\u9ad8\u8001\u5e84\u4e2d\u5fc3\u5927\u885715\u53f7'});\n            }}>\u6539\u5b66\u6821address\n            <\/button>\n        <\/div>\n    <\/div>;\n};\n\n\nconst root = ReactDOM.createRoot<\/em>(document.getElementById('root'));\nroot.render(\n    <div>\n        <Provider store={store}>\n            <App\/>\n        <\/Provider>\n    <\/div>\n);<\/pre>\n","protected":false},"excerpt":{"rendered":"
    A Predictable State Container for JS Apps A Predictable […]<\/p>\n","protected":false},"author":1,"featured_media":6205,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[198],"tags":[202,263],"_links":{"self":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6197"}],"collection":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6197"}],"version-history":[{"count":9,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6197\/revisions"}],"predecessor-version":[{"id":6213,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/posts\/6197\/revisions\/6213"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=\/wp\/v2\/media\/6205"}],"wp:attachment":[{"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lilichao.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}