关于react.js:react-动态加载路由

前言

react-router4 不再举荐将所有路由规定放在同一个中央集中式路由，子路由应该由父组件动静配置，组件在哪里匹配就在哪里渲染，更加灵便

引入必要的依赖

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

接下来创立一个component函数

目标就是为了变为router的component实现异步加载。

// 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办法，间接返回空
        this.setState = (state,callback)=>{
            return;
        };  
    }
      render() {
        const { Component } = this.state
        if (Component) {
          return <Component {...this.props} />
        }
        return null
      }
    }
  }

在此阐明componentWillUnmount钩子是为了解决Can only update a mounted or mounting component的这个问题，起因是当来到页面当前，组件曾经被卸载，执行setState时无奈找到渲染组件。

接下来实现本地文件门路的传入

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

将已知地址门路传递到一个函数并把这个函数作为参数传递到 asyncComponent中这样asyncComponent就能接管到这个路由的地址了，而后咱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="集体助理" 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="零碎音讯" path="SystemMessage/:data" component={asyncComponent(() => load('GlobalNotification/SystemMessage/SystemMessage'))}/>
                <Route name="SystemMessagePer" breadcrumbName="零碎音讯详情" path="SystemMessagePer/:data" component={asyncComponent(() => load('GlobalNotification/SystemMessage/SystemMessagePer'))}/>
            </Route>
        </Router>
 </Router>       

从代码中能够看出曾经实现了router 的component 的引入，这样天然就能够通过一个循环来实现动静的加载啦！