前言
相信很多人都遇到过想在React项目中动态加载路由这种问题,接下来我们逐步实现。
引入必要的依赖
import React from 'react' import { Router, Route, IndexRoute, hashHistory } from 'react-router'
接下来创建一个component函数
目的就是为了变为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方法,直接返回空 this.setState = (state,callback)=>{ return; }; } render() { const { Component } = this.state if (Component) { return <Component {...this.props} /> } return null } } }
在此说明componentWillUnmount钩子是为了解决Can only update a mounted or mounting component的这个问题,原因是当离开页面以后,组件已经被卸载,执行setState时无法找到渲染组件。
接下来实现本地文件路径的传入
function load(component) { return import(`./routes/${component}`) }
将已知地址路径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就能接收到这个路由的地址了,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="系统消息" path="SystemMessage/:data" component={asyncComponent(() => load('GlobalNotification/SystemMessage/SystemMessage'))}/> <Route name="SystemMessagePer" breadcrumbName="系统消息详情" path="SystemMessagePer/:data" component={asyncComponent(() => load('GlobalNotification/SystemMessage/SystemMessagePer'))}/> </Route> </Router> </Router>
从代码中可以看出已经实现了router 的component 的引入,这样自然就可以通过一个循环来实现动态的加载啦!