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@@ -0,0 +1,54 @@
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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: fixed;
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+ top:0;
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+ left:0;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box"></div>
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+ <script>
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+ // 获取元素
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+ var box = document.querySelector(".box");
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+ // 获取整个文档
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+ var doc = document.documentElement;
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+ // 绑定事件
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+ box.onmousedown = function(e){
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+ // 元素距离顶部的距离
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+ var docTop = box.offsetTop;
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+ // 元素距离左侧的距离
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+ var docLeft = box.offsetLeft;
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+ // 鼠标点击的位置距离顶部的间距
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+ var mouseTop = e.clientY;
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+ // 鼠标点击的位置距离左侧的间距
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+ var mouseLeft = e.clientX;
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+ // 获取鼠标点击位置距离元素顶部的间距
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+ var resTop = mouseTop - docTop;
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+ // 获取鼠标点击位置距离元素左侧的间距
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+ var resLeft = mouseLeft - docLeft;
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+ // 给整个文档绑定移动事件
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+ doc.onmousemove = function(event){
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+ // 拖动时 正方形的位置会改变
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+ box.style.left = event.clientX - resLeft + "px";
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+ box.style.top = event.clientY - resTop + "px";
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+ }
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+
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+ }
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+ // 给整个文档绑定鼠标松开事件
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+ doc.onmouseup = function(){
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+ // 鼠标松开时 正方形停止移动
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+ doc.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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