react路由初探（1）

import React from 'react';
import logo from './logo.svg';
import './App.css';class About extends React.Component {
render() {
return (<div>
<h1>About</h1>
</div>)
}
}
class Inbox extends React.Component {
render() {
return (<div>
<h1>Inbox</h1>
</div>)
}
}class Home extends React.Component {
render() {
return (<div>
<h1>Home</h1>
</div>)
}
}class App extends React.Component {
constructor() {
super()
this.state = { route: '' }
}
componentDidMount() {
window.addEventListener('hashchange', () => {
this.setState({
route: window.location.hash.substr(1)
})
})
}
render() {
let Child
switch (this.state.route) {
case '/about': Child = About; break;
case '/inbox': Child = Inbox; break;
default: Child = Home;
}
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<h3>用于构建用户界面的JavaScript库</h3>
<p>
<a href="#/home"><button>home</button></a>
<a href="#/about"><button>about</button></a>
<a href="#/inbox"><button>inbox</button></a>
</p>
</header>
<div className="container">
<Child />
</div>
</div>
);
}
}export default App;