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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ #box{
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+ width: 100px;
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+ height: 100px;
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+ background-color: red;
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+ position: absolute;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div id="box"></div>
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+ <script>
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+ // 第一步获取元素 正方形
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+ var oBox = document.getElementById("box");
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+ // 获取页面
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+ var oPage = document.documentElement;
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+
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+ // 第二步给元素添加事件 给正方形绑定鼠标按下事件
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+ oBox.onmousedown = function(e){
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+ // 记录鼠标点击时在正方形的哪个位置
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+ var x = e.offsetX;
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+ var y = e.offsetY;
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+ // 第三步给页面绑定移动事件
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+ oPage.onmousemove = function(e){
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+ oBox.style.top = (e.clientY - y)+ "px";
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+ oBox.style.left = (e.clientX - x)+ "px";
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+ }
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+ }
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+ // 第四步移除页面移动事件
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+ oBox.onmouseup = function(){
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+ oPage.onmousemove = null;
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+ }
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+ </script>
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+</body>
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+</html>
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