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最新推荐文章于 2025-06-11 14:10:18 发布

原创最新推荐文章于 2025-06-11 14:10:18 发布 · 578 阅读

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<!DOCTYPE html>
<html>
<head>
	<title></title>
	<style type="text/css">
		.box{
			width: 100px;
			height: 100px;
			top: 50px;
			left: 50px;
			position: absolute;
			background-color: red;

		}
	</style>
</head>
<body>
<div class="box"></div>
<script type="text/javascript">
	var drag = {
		init:function(dom){
			this.dom = dom;
			this.bindEvent();
		},
		bindEvent:function(){
			this.dom.onmousedown =this.mouseDown.bind(this);//call和apply会立即执行这个函数，而bind不会
		},
		mouseDown:function(e){
			document.onmousemove = this.mouseMove.bind(this);
			document.onmouseup = this.mouseUp.bind(this);

			this.X = e.clientX - this.dom.offsetLeft;
			this.Y = e.clientY - this.dom.offsetTop;

		},
		mouseMove:function(e){
			this.newX = e.clientX - this.X;
			this.newY = e.clientY - this.Y;

			this.dom.style.top = this.newY + "px";
			this.dom.style.left = this.newX + "px";
		},
		mouseUp:function(e){
			document.onmousemove = null;
			document.onmouseup = null;
		}

	}
	var box = document.getElementsByClassName("box")[0];
	drag.init(box);
</script>
</body>
</html>