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最好的拖拽js

<!DOCTYPE html><html lang="en">	<head>		<meta charset="UTF-8" />		<title>拖拽js</title>		<style type="text/css">			html,			body {				overflow: hidden;			}						body,			div,			{				margin: 0;				padding: 0;			}						body {				color: #fff;				font: 12px/2 Arial;			}						p {				padding: 0 10px;				margin-top: 10px;			}						span {				color: #ff0;				padding-left: 5px;			}						#box {				position: absolute;				width: 300px;				height: 150px;				background: #D5CDDA;				border: 2px solid #ccc;				top: 150px;				left: 400px;				margin: 0;			}						#drag {				height: 25px;				cursor: move;				background: #724a88;				border-bottom: 2px solid #ccc;				padding: 0 10px;			}		</style>	</head>	<body>		<div id="box">			<div id="drag">拖动区域</div>			被拖动的整个div		</div>	</body></html><script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script><script type="text/javascript">	$(function() {			moveBox($("#box"), $("#drag"));		})		//B被拖动的div,BT可拖动区域	function moveBox(B, BT) {		var bDrag = false;		var _x, _y;		BT.mousedown(function(event) {			var e = event || window.event;			bDrag = true;			_x = e.pageX - B.position().left;			_y = e.pageY - B.position().top;			return false		})		$(document).mousemove(function(event) {			if(!bDrag) return false;			var e = event || window.event;			var x = e.pageX - _x;			var y = e.pageY - _y;			console.log(B.position());			var maxL = $(document).width() - B.outerWidth();			var maxT = $(document).height() - B.outerHeight();			x = x < 0 ? 0 : x;			x = x > maxL ? maxL : x;			y = y < 0 ? 0 : y;			y = y > maxT ? maxT : y;			B.css({				left: x,				top: y			});			return false		}).mouseup(function() {			bDrag = false;			return false		})	}</script>

  

最好的拖拽js