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jquery實現側邊欄左右伸縮

jquery實現點選側邊欄伸縮效果。點選收縮,側邊欄向左收縮,顯示按鈕顯示;點選顯示按鈕,顯示按鈕向左收縮,側邊欄顯示。

具體程式碼如下:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<script src="js/jquery.js" type="text/javascript" charset="utf-8"></script>
		<style>
			*{margin: 0;padding: 0;}
			#box{width: 100%;height: 100%;}
			#left{width: 200px;float: left;background-color: royalblue;position: relative;}
			#btn{width: 100%;height: 50px;background-color: darkgoldenrod;line-height: 50px;text-align: center;color: white;cursor: pointer;}
			#btnb{width: 50px;height: 50px;background-color: red;position: absolute;cursor: pointer;left: -50px;line-height: 50px;text-align: center;}

		</style>
	</head>
	<body>
		<div id="box">
			<div id="left">
				<div id="btn">收縮</div>
			</div>
			<div id="btnb">
				顯示
			</div>
		</div>
		<script type="text/javascript">
			$(function(){
				$a = $(window).height();
				$("#left").height($a);
				$("#btn").click(function(){
					$("#left").animate({left:'-200px'});
					$("#btnb").delay(500).animate({left:'0'});
				});
				$("#btnb").click(function(){
					$("#btnb").animate({left:'-50px'});
					$("#left").delay(500).animate({left:'0'});
				});
			});
		</script>
	</body>
</html>

效果圖: