1. Create a ProtectedRoute is nothing but just a react component render a Route component: check the 'loggedIn' props, if true, then using render prop to render the component normally. If 'loggedIn' props is fa
1. Create a ProtectedRoute is nothing but just a react component render a Route component: check the 'loggedIn' props, if true, then using render prop to render the component normally. If 'loggedIn' props is false, then use 'Redirect' component to redirect to Home page. also pass the ...
import React from 'react'; import ReactDOM from 'react-dom'; import {BrowserRouter, Route} from "react-router-dom"; class Bar extends React.Component { componentDidMount() { console.log("componentDidMount") } render() { const {idx} = this.props; return ( in Bar : {idx} ) } } ...
ReactDOM.render(<App/>, document.getElementById('root')); 然而此时点击按钮,发现Bar的componentDidMount一直被调用,就像上面文档中说的一样 That means if you provide an inline function to the component prop, you would create a new component every render. This results in the existing component unmo...
react-router是一些封装好的组件用于前端路由，当我们点击的时候会出现一个虚拟的路由，并不会做页面的全...
import {BrowserRouter, Route} from "react-router-dom"; class Bar extends React.Component { componentDidMount() { console.log("componentDidMount") } render() { return ( Bar ) } } class App extends React.Component { constructor(prop
React Router 4.0 作出了一些更新 引入: import { HashRouter, Route, Switch } from 'react-router-dom';component={组件} 组件直接挂载到router下面, render={()=>{组件}}本身就是个组件, 组件内…
React的Route中使用render和用component添加组件有什么不同？this 指向问题，component={组件} 组件...
原因就是React.createElement()传入的值,如果你把函数传入进去,那么这个返回结果的type就指向这个函数本身,如果两次调用传入的参数不一样,那么这两次返回的结果(也就是JSX实例)的type当然也会不一样,这样就会造成diff算法判断出这两个组件不同,就会执行"删除老的,创建新的"的操作。 这也就是为什么使用component并且...
react用子组件(有RouteComponentProps)报错:'match' is missing in type '' 因为子组件有RouteComponentProps,所以在父组件中引用需要传相应的属性。但考虑到如果层级较深的话一层一层传就很麻烦。而如果我们用route组件引用的话就会很简单,只需要在需要子组件的地方用route的render属性就可以了:...