通过表达式、函数给React组件属性赋值

一、需求

当有传属性name的值时，则显示Hello "name",否则显示Hello World

二、4种方式的代码实现

1.通过三元运算符

<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>

<body>
    <script src="./react-0.13.2/build/react.js"></script>
    <script src="./react-0.13.2/build/JSXTransformer.js"></script>
	<script type="text/jsx">
		var style = {
			color : "red",
			border: "1px #000 solid",
		};
		var HelloWorld = React.createClass({
			render: function(){
				return <p>你好，{this.props.name ? this.props.name : "World!"} </p>;
			}
		});
		React.render(<div style={style}><HelloWorld name="李小龙!"></HelloWorld></div>, document.body);
	</script>
</body>

</html>

　　

2.通过变量

<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>

<body>
    <script src="./react-0.13.2/build/react.js"></script>
    <script src="./react-0.13.2/build/JSXTransformer.js"></script>
	<script type="text/jsx">
		var style = {
			color : "red",
			border: "1px #000 solid",
		};
		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>你好， {name}</p>;
			}
		});
		React.render(<div style={style}><HelloWorld name="李小龙!"></HelloWorld></div>, document.body);
	</script>
</body>

</html>

　　

3.直接在属性调用函数

<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>

<body>
    <script src="./react-0.13.2/build/react.js"></script>
    <script src="./react-0.13.2/build/JSXTransformer.js"></script>
	<script type="text/jsx">
		var style = {
			color : "red",
			border: "1px #000 solid",
		};
		var HelloWorld = React.createClass({
			getName : function(){
				if(this.props.name)
					return this.props.name
				else
					return "World!"	
			},
			render: function(){
				return <p>你好， {this.getName()}</p>;
			}
		});
		React.render(<div style={style}><HelloWorld name="李小龙!"></HelloWorld></div>, document.body);
	</script>
</body>

</html>

　　

4.用与运算

<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>

<body>
    <script src="./react-0.13.2/build/react.js"></script>
    <script src="./react-0.13.2/build/JSXTransformer.js"></script>
	<script type="text/jsx">
		var style = {
			color : "red",
			border: "1px #000 solid",
		};
		var HelloWorld = React.createClass({
			render: function(){
				return <p>你好， {this.props.name || "World!"}</p>;
			}
		});
		React.render(<div style={style}><HelloWorld name="李小龙!"></HelloWorld></div>, document.body);
	</script>
</body>

</html>

　　

三、运行结果

posted @ 2015-12-15 23:53  shamgod  阅读(5353)  评论(0)  编辑  收藏  举报
haha