react h5 发版白屏问题解决方案

背景：h5应用每次发布之后会有部分用户白屏
React v5

1. 优化路由加载时间 app.jsx

render() {if(this.state.loading) {return <PendingPage />}return (<Router><Suspense fallback={<PendingPage />}>{this.state.showPage ?<Switch>{routes.map((route, i) => (<RouteWithSubRoutes key={i} {...route} />))}</Switch>: <PendingPage />}</Suspense></Router>);}

2. 自刷新模式build_version-react路由

const path = require("path");
const fs = require("fs");// 将当前时间戳写入json文件
let json_obj = { build_version: new Date().getTime().toString(),status:200,success:true };
fs.writeFile(path.resolve(__dirname, "./public/json/build_version.json"),JSON.stringify(json_obj),function(err) {if (err) {return console.error(err);}console.log("打包字符串写入文件：public/json/build_version.json，成功！");}
);
// "build": "node create_build_version_json.js && react-app-rewired build",
// 写入package.json 打包先执行次node.js

增加react路由守卫，在每次切换页面去请求生成的时间戳

// FrontendAuth.js
import React, { Component } from "react";
import { Route, Redirect } from "react-router-dom";
import axios from "axios";class FrontendAuth extends Component {constructor(props) {super(props);}render() {const { routerConfig, location } = this.props;const { pathname } = location;axios.get("/json/build_version.json?v=" + new Date().getTime().toString()).then(res=>{let newBuildStr = res.data.build_version;let oldBuildStr = localStorage.getItem("build_version") || "";if (oldBuildStr !== newBuildStr) {localStorage.setItem("build_version", newBuildStr);window.location.reload();}})const targetRouterConfig = routerConfig.find((item) => item.path === pathname);if (targetRouterConfig) {const { component } = targetRouterConfig;return <Route exact path={pathname} component={component} />;}}
}export default FrontendAuth;

// app.jsx
render() {return (<Router><Suspense fallback={<PendingPage />}><Switch><FrontendAuth routerConfig={routerMap} /></Switch></Suspense></Router>);
}
// router/routerMap.js-路由集合
const Index= React.lazy(() => import('../pages/index/index.jsx'));
export default [{path: '/index',component: Index,}
]

3. webpack打包生成的js版本号_v=hash值（config-overrides.js）

config.output.filename = 'static/js/[name].[contenthash].js?_v=[contenthash]'
config.output.chunkFilename = 'static/js/[name].[contenthash].chunk.js?_v=[contenthash]'
// 某些浏览器可能会忽略.js?v=xxxx

4. ng配置不缓存html(已存在)

#对html文件限制缓存        
location ~ .*\.(html)$ {            add_header Cache-Control no-store;add_header Pragma no-cache;        
}

5. 前端html header（index.html）（已存在）

<metahttp-equiv="cache-control"content="no-cache,no-store, must-revalidate"
/>
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Cache" content="no-cache" />

6. 灰度发布 / 服务器增加一台灰度服务器，运维控制流量切换服务器，着步切换

注: 目前灰度方案由前端cookie控制，但是必须要先全量发布之后才能走灰度，灰度方案不支持。
根据自己的情况。

7. 新增js报错监控，如果检测到js报错，跳转空页面。手动点击登录。(app.jsx)

componentDidCatch(error, info) {if (String(error).includes('Loading chunk')) {// 解决灰度切换js缺失的问题window.location.reload();} else {// 容错机制-会导致所有的报错回到此页面-再考虑一下！// window.location.replace('/404')}}