媒介

置信很多人都遇到过想在React项目中动态加载路由这类题目，接下来我们逐渐完成。

引入必要的依靠

import React from 'react'
import { Router, Route, IndexRoute, hashHistory } from 'react-router'

接下来建立一个component函数

目标就是为了变成router的component完成异步加载。

// 异步按需加载component
function asyncComponent(getComponent) {
    return class AsyncComponent extends React.Component {
      static Component = null;
      state = { Component: AsyncComponent.Component };
  
      componentDidMount() {
        if (!this.state.Component) {
          getComponent().then(({default: Component}) => {
            AsyncComponent.Component = Component
            this.setState({ Component })
          })
        }
      }
      //组件将被卸载  
    componentWillUnmount(){ 
        //重写组件的setState要领，直接返回空
        this.setState = (state,callback)=>{
            return;
        };  
    }
      render() {
        const { Component } = this.state
        if (Component) {
          return <Component {...this.props} />
        }
        return null
      }
    }
  }

在此申明componentWillUnmount钩子是为了处理Can only update a mounted or mounting component的这个题目，原因是当脱离页面今后，组件已被卸载，实行setState时没法找到衬着组件。

接下来完成当地文件途径的传入

 function load(component) {
    return import(`./routes/${component}`)
  }

将已知地点途径通报到一个函数并把这个函数作为参数通报到 asyncComponent中如许asyncComponent就能够接收到这个路由的地点了，然后我们要做的就是将这个asyncComponent函数带入到router中。

<Router history={hashHistory}>
        <Route name="home" breadcrumbName="首页" path="/" component={MainLayout}>
            <IndexRoute name="undefined" breadcrumbName="未定义" component={() => <div>未定义</div>}/>
            <Route name="Development" breadcrumbName="施工中" path="Development" component={DevelopmentPage}/>
            <Route breadcrumbName="个人助理" path="CustomerWorkTodo" component={({children}) => <div className="box">{children}</div>}>
                <Route name="Agency" breadcrumbName="待办事项" path="Agency" component={asyncComponent(() => load('GlobalNotification/CustomerWorkAssistantTodo/CustomerAgencyMatter'))}/>
                <Route name="Already" breadcrumbName="已办事项" path="Already" component={asyncComponent(() => load('GlobalNotification/CustomerWorkAssistantTodo/CustomerAlreadyMatter'))}/>
                <Route name="SystemMessage" breadcrumbName="体系音讯" path="SystemMessage/:data" component={asyncComponent(() => load('GlobalNotification/SystemMessage/SystemMessage'))}/>
                <Route name="SystemMessagePer" breadcrumbName="体系音讯概况" path="SystemMessagePer/:data" component={asyncComponent(() => load('GlobalNotification/SystemMessage/SystemMessagePer'))}/>
            </Route>
        </Router>
 </Router>       

从代码中能够看出已完成了router 的component 的引入，如许天然就能够够经由过程一个轮回来完成动态的加载啦！