jquerylearn/events1.html at master · caesarjuly/jquerylearn · GitHub

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<!DOCTYPE HTML>
<html lang="en">
<head>

	<meta charset="UTF-8">
	<title>jquery Events</title>
	<link media="all" rel="stylesheet" href="day.css" type="text/css" />
</head>
<body>
<h1>My Website</h1>

<button data-file = "day">Day</button>
<button data-file = "night">Night</button>

	<script src="jquery.js" type="text/javascript"></script>
	<script>

		(function(){
		var link = $('link');	//定义变量link，将选择结果赋予变量
		$('button').click(function(){
			var $this = $(this),	//这个$this要带$应该是用来标记this是个变量
				stylesheet = $this.data('file');	//将data-file的值赋给stylesheet

			link.attr('href', stylesheet+'.css');	//改变link的css链接值
			$this
				.siblings('button')
					.removeAttr('disabled')
						.end()						//回到$this元素
						.attr('disabled', 'disabled');	//将其属性设为不可用
		});
		})();
	</script>
</body>
</html>