React扩展之懒加载

创建About 和 Home组件

import React, { Component } from 'react'

export default class About extends Component {
    render() {
        return (
            <h2>我是About组件</h2>
        )
    }
}

import React, { Component } from 'react'

export default class Home extends Component {
    render() {
        return (
            <h2>我是Home组件</h2>
        )
    }
}

创建Loading 组件

import React, { Component } from 'react'

export default class Loading extends Component {
    render() {
        return (
            <div>
                <h1 style={{backgroundColor:'gray',color:'orange'}}>Loading....</h1>
            </div>
        )
    }
}

使用

import React, { Component,lazy,Suspense} from 'react'
import {NavLink,Route} from 'react-router-dom'

// import Home from './Home'
// import About from './About'

import Loading from './Loading'
const Home = lazy(()=> import('./Home') )
const About = lazy(()=> import('./About'))

export default class Demo extends Component {
    render() {
        return (
            <div>
                <div className="row">
                    <div className="col-xs-offset-2 col-xs-8">
                        <div className="page-header"><h2>React Router Demo</h2></div>
                    </div>
                </div>
                <div className="row">
                    <div className="col-xs-2 col-xs-offset-2">
                        <div className="list-group">
                            {/* 在React中靠路由链接实现切换组件--编写路由链接 */}
                            <NavLink className="list-group-item" to="/about">About</NavLink>
                            <NavLink className="list-group-item" to="/home">Home</NavLink>
                        </div>
                    </div>
                    <div className="col-xs-6">
                        <div className="panel">
                            <div className="panel-body">
                                <Suspense fallback={<Loading/>}>
                                    {/* 注册路由 */}
                                    <Route path="/about" component={About}/>
                                    <Route path="/home" component={Home}/>
                                </Suspense>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        )
    }
}