javascript拖动效果 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #box {
            width: 100px;
            height: 100px;
            background-color: aqua;
            /*必须加定位*/
            position: absolute;
        }
    </style>
    <script>
        window.onload = function () {
            var box = document.getElementById('box')
            box.onmousedown = function () {
                document.onmousemove = function (event) {
                    //兼容
                    event = event || window.event
                    //如果有滚动条获取滚动条距离
                    var st = document.body.scrollTop || document.documentElement.scrollTop
                    var sl = document.body.scrollLeft || document.documentElement.scrollLeft
                    let x = event.clientX
                    let y = event.clientY
                    box.style.left = x + st + 'px'
                    box.style.top = y + sl + 'px'
                }
                document.onmouseup = function () {
                    document.onmousemove = null;
                    document.onmouseup = null;
                }

            }
        }
    </script>
</head>

<body>
    <div id="box"></div>
</body>

</html>
posted @ 2022-05-20 17:44  Code_Lzh  阅读(21)  评论(0)    收藏  举报