js特效拖拽

js 特效拖拽
js特效拖拽
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #div{
            width: 100px;
            height: 100px;
            background-color: blue;
            position:absolute;
            top: 20px;
            left: 300px;
        }
    </style>
</head>
<body>
    <div id = "div"></div>

    <script type="text/javascript">
        var muvDiv = document.getElementById('div');
        muvDiv.onmousedown = function(){
            // 1.鼠标位置减去盒子位置，获取差值
            var ol = event.clientX - muvDiv.offsetLeft;
            var ot = event.clientY - muvDiv.offsetTop;

            document.onmousemove = function(){
                var event = event || window.event;
                // 2.获取当前鼠标位置，减去差值，求出准确位置
                var top = event.clientY - ot;
                var left = event.clientX - ol;
                // 3.给css获取新值
                muvDiv.style.top = top + 'px';
                muvDiv.style.left = left + 'px';
            }
        }

        // 4.清除onmousemove函数
        document.onmouseup = function(){
            document.onmousemove = null;
        }
    </script>
</body>
</html>
js特效 拖拽

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