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@@ -0,0 +1,41 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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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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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <div class="box"></div>
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+ <script>
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+ var oBox = document.getElementsByClassName("box")[0];
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+ var oDoc = document.documentElement;
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+
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+ oBox.onmousedown = function (event) {
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+ // console.log(oBox.offsetTop);
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+ // console.log(event.clientY);
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+ var y = event.clientY - oBox.offsetTop;
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+ var x = event.clientX - oBox.offsetLeft;
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+ oDoc.onmousemove = function (event) {
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+ oBox.style.top = event.clientY - y + "px";
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+ oBox.style.left = event.clientX - x + "px";
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+ }
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+ }
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+
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+ oBox.onmouseup = function () {
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+ oDoc.onmousemove = null;
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+ }
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+ </script>
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+</body>
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+
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+</html>
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