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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <style>
- .box {
- width: 100px;
- height: 100px;
- background-color: red;
- position: fixed;
- }
- </style>
- </head>
- <body>
- <div class="box"></div>
- <script>
- var oBox = document.getElementsByClassName("box")[0];
- var oDoc = document.documentElement;
- oBox.onmousedown = function (event) {
- // console.log(oBox.offsetTop);
- // console.log(event.clientY);
- var y = event.clientY - oBox.offsetTop;
- var x = event.clientX - oBox.offsetLeft;
- oDoc.onmousemove = function (event) {
- oBox.style.top = event.clientY - y + "px";
- oBox.style.left = event.clientX - x + "px";
- }
- }
- oBox.onmouseup = function () {
- oDoc.onmousemove = null;
- }
- </script>
- </body>
- </html>
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