react-router v4 按需加载的配置方法
Posted SunLemon
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在react项目开发中,当访问默认页面时会一次性请求所有的js资源,这会大大影响页面的加载速度和用户体验。所以添加按需加载功能是必要的,以下是配置按需加载的方法:
安装bundle-loader
npm install --save-dev bundle-loader
定义Bundle.js
import React, { Component } from ‘react‘; export default class Bundle extends React.Component { constructor(props) { super(props); this.state = { // short for "module" but that‘s a keyword in js, so "mod" mod: null } } componentWillMount() { this.load(this.props) } componentWillReceiveProps(nextProps) { if (nextProps.load !== this.props.load) { this.load(nextProps) } } load(props) { this.setState({ mod: null }) props.load((mod) => { this.setState({ // handle both es imports and cjs mod: mod.default ? mod.default : mod }) }) } render() { if (!this.state.mod) return false return this.props.children(this.state.mod) } }
app.jsx配置
import React from ‘react‘; import ReactDOM from ‘react-dom‘; import { HashRouter, Route } from ‘react-router-dom‘; import * as routePaths from ‘./js/constants/routePaths‘; import Bundle from ‘./js/constants/Bundle.js‘; //默认打开页面直接引入 import Index from ‘./js/pages/Index‘; //其他页面异步引入 import CardContainer from ‘bundle-loader?lazy&name=app-[name]!./js/pages/Card‘; import ‘./assets/css/index.scss‘; const Card = () => ( <Bundle load={CardContainer}> {(Card) => <Card />} </Bundle> ) ReactDOM.render(( <HashRouter> <div className="container"> <Route path={routePaths.INDEX} exact component={Index} /> <Route path=‘/card‘ component={Card} /> </div> </HashRouter> ), document.getElementById(‘app‘) );
webpack.config.js 修改
webpackConfig.output = { path: path.resolve(__dirname, ‘build/‘ + config.ftpTarget), publicPath: config.publicPath + ‘/‘, filename: ‘js/[name].js‘, chunkFilename: ‘js/[id].js‘ }
这样就可以实现页面js资源按需加载了,打包后的文件命名可以根据自己需要设置。
react-router v4 中文官网:http://reacttraining.cn/web/guides/quick-start
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