javascript div跟随鼠标移动

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script type="text/javascript">
        window.onload = function () {
            var div1 = document.getElementById('div1');
            document.onmousemove = function (ev) {
                //IE支持event,firefox不支持
                var oEvent = ev || event;
                //
                var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
                var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
                div1.style.top = oEvent.clientY + scrollTop + 'px'; //Y
                div1.style.left = oEvent.clientX + scrollLeft + 'px';//X
            };
        };

    </script>
</head>
<body>
    <div id="div1" style="width: 10px; height: 10px; background-color: blue; position: absolute;"></div>
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</body>
</html>

 

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