简单的jquery 拖动DIV

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jquery 拖动层是常用的效果。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>jquery 拖动DIV</title>
</head>
<style>
    #tt{
        position:absolute;top:0;left:0;width:200px;height:200px;border:1px solid red;background-color:red;
    }
</style>
<script language="javascript">
    $(function () {
        var popupDiv = $("#tt");
        var _move = false;		//移动标记
        var _x, _y;				//鼠标离控件左上角的相对位置
        popupDiv.mousedown(
                function (e) {
                    _move = true;
                    _x = e.pageX - parseInt(popupDiv.css("left"));
                    _y = e.pageY - parseInt(popupDiv.css("top"));
                }).mousemove(
                function (e) {
                    if (_move) {
                        var x = e.pageX - _x;//移动时根据鼠标位置计算控件左上角的绝对位置
                        var y = e.pageY - _y;
                        if (x > 0 && y > 0)
                            popupDiv.css({top:y, left:x});//控件新位置
                    }
                }).mouseup(
                function () {
                    _move = false;
                }).mouseout(function () {
                    _move = false;
                });
    });
</script>
<body>
<div id="tt">注意：style中必须含有position:absolute;top:0;left:0;三个属性否则拖不动！</div>
</body>
</html>

另一种方法

<script type="text/javascript">
    $(function () {
        $("#main img").mousedown(function (e) {
            var oe=e||window.event;
            var odiv = document.getElementById($(this).attr("id"));
            $(this).css("z-index", "100").siblings().css("z-index", "0");
            var $this = odiv;
            var startX = oe.clientX - $this.offsetLeft;
            var startY = oe.clientY - $this.offsetTop;
            //$this.className = "on";
            document.onmousemove = function (e) {
                var oe = e || window.event;
                $this.style.left = oe.clientX - startX + "px";
                $this.style.top = oe.clientY - startY + "px";
            };
            document.onmouseup = function () {
                document.onmousemove = null;
                document.onmouseup = null;
                //$this.className = "off";
                if ($this.releaseCapture) {
                    $this.releaseCapture();
                }
            };
            if ($this.setCapture) {
                $this.setCapture();
            }
            return false;
        });
    });
</script>