JQ 拖拽

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>拖拽</title>
<style>
*{
	padding: 0;
	margin: 0;
}
div{
	width: 100px;
	height: 100px;
	background: #f00;
	cursor: pointer;
	position: absolute;
	left: 0;
	top: 0;
}
</style>
</head>
<body>
<div></div>
<script src="jquery.js"></script>
<script>
$(function(){
	//移动窗口的步骤
	//1、按下鼠标左键
	//2、移动鼠标
	$('div').mousedown(function(e){
		// e.pageX
		var positionDiv = $(this).offset();
		var distenceX = e.pageX - positionDiv.left;
		var distenceY = e.pageY - positionDiv.top;
		//alert(distenceX)
		// alert(positionDiv.left);
		$(document).mousemove(function(e){
			var x = e.pageX - distenceX;
			var y = e.pageY - distenceY;
			if(x<0){
				x=0;
			}else if(x>$(document).width()-$('div').outerWidth(true)){
				x = $(document).width()-$('div').outerWidth(true);
			}
			if(y<0){
				y=0;
			}else if(y>$(document).height()-$('div').outerHeight(true)){
				y = $(document).height()-$('div').outerHeight(true);
			}

			$('div').css({
				'left':x+'px',
				'top':y+'px'
			});
		});
		$(document).mouseup(function(){
			$(document).off('mousemove');
		});
	});
});
</script>
</body>
</html>
效果图：
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