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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: 300px;
- height: 300px;
- background: aqua;
- position: absolute;
- }
- </style>
- </head>
- <body>
- <div id="box"></div>
- <script>
- var box = document.getElementById("box");
- // console.log(box.offsetLeft)
- // console.log(box.offsetTop)
- box.onmousedown = function(event) {
- var xLeft = event.clientX - box.offsetLeft;
- var yTop = event.clientY - box.offsetTop;
- box.onmousemove = function(event) {
- box.style.top = event.clientY - yTop + 'px';
- box.style.left = event.clientX - xLeft + 'px';
- }
- }
- box.onmouseup = function() {
- box.onmousemove = null;
- }
- </script>
- </body>
- </html>
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