標籤：條件判斷 tle meta 三目運算 his set on() 三目運算子 name
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ReactJs</title><script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>
<script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>
<script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script>
<script src="https://cdn.bootcss.com/jquery/2.1.4/jquery.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
// 條件判斷的四種形式
//======== 1 （三目運算子）=======
// var HelloWorld = React.createClass({
// render:function () {
// return <p>Hello, {this.props.name ? this.props.name : "World"}</p>;
// }
// });
//======= 2 （函數形式）==========
// var HelloWorld = React.createClass({
// getName: function () {
// if(this.props.name)
// return this.props.name
// else
// return "world"
// },
// render: function(){
// var name = this.getName();
// return <p>Hello,{name}</p>;
// }
// });
// ReactDOM.render(
// <HelloWorld name="launch"/>,
// document.getElementById(‘example‘)
// );
//函數調用也是一種運算式
//====== 3 =========
// var HelloWorld = React.createClass({
// getName: function () {
// if(this.props.name)
// return this.props.name
// else
// return "world"
// },
// render: function(){
// return <p>Hello,{this.getName()}</p>;
// }
// });
// ReactDOM.render(
// <HelloWorld name="launch"/>,
// document.getElementById(‘example‘)
// );
//======= 4 （比較子）========
var HelloWorld = React.createClass({
render: function(){
return <p>Hello,{this.props.name || "World"}</p>;
}
});
ReactDOM.render(
<HelloWorld name="launch"/>,
document.getElementById(‘example‘)
);
</script>
</body>
</html>
ReactJs條件判斷的四種形式
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
