react學習---state的簡寫形式
阿新 • • 發佈:2022-01-02
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>state簡寫方式</title>
</head>
<body>
<!-- 準備好一個“容器” -->
<div id="test"></div>
<!-- 引入react核心庫 -->
<script type="text/javascript" src="../js/react.development.js" ></script>
<!-- 引入react-dom,用於支援react操作DOM -->
<script type="text/javascript" src="../js/react-dom.development.js"></script>
<!-- 引入babel,用於將jsx轉為js -->
<script type="text/javascript" src="../js/babel.min.js"></script>
<script type="text/babel" >
//1.建立元件
class Weather extends React.Component{
//初始化狀態
state = {isHot:false,wind:'微風'}
render(){
const {isHot,wind} = this.state
return <h1 onClick={this.changeWeather}>今天天氣很{isHot ? '炎熱' : '涼爽'},{wind}</h1>
}
//自定義方法————要用賦值語句的形式+箭頭函式
changeWeather = ()=>{
const isHot = this.state.isHot
this.setState({isHot:!isHot})
}
}
//2.渲染元件到頁面
ReactDOM.render(<Weather/>,document.getElementById('test'))
</script>
</body>
</html>