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代码
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><script src="../js/react.development.js"></script><script src="../js/react-dom.development.js"></script><script src="../js/babel.min.js"></script>
</head>
<body><div id="app"></div><script type="text/babel">class Weather extends React.Component {// 类中的赋值语句，state = xxx 相当于 this.state = xxxstate = {isHot: false, wind: '微风'}render () {const {isHot, wind} = this.statereturn <h1 onClick={this.changeWeather}>今天天气很{isHot ? '炎热' : '凉爽'}. {wind}</h1>}// 箭头函数内部没有 this，访问外层 this，而类中外层 this 为类的实例changeWeather = () => {const {isHot} = this.statethis.setState({isHot: !isHot})}}ReactDOM.render(<Weather/>, document.getElementById('app'))</script>
</body>
</html>
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