JS各种各样的拖动效果

<html>
<head><title>拖动效果函数演示 by Longbill.cn</title>
<style>
body
{
    font-size:12px;
    color:#333333;
    border : 0px solid blue;
}
div
{
    position : absolute;
    background-color : #c3d9ff;
    margin : 0px;
    padding : 5px;
    border : 0px;
    width : 100px;
    height:100px;
}
</style>
</head>
<body>
<script>
function drag(o,s)
{
    if (typeof o == "string") o = document.getElementById(o);
    o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;
    o.orig_y = parseInt(o.style.top) - document.body.scrollTop;
    o.orig_index = o.style.zIndex;

    o.onmousedown = function(a)
    {
        this.style.cursor = "move";
        this.style.zIndex = 10000;
        var d=document;
        if(!a)a=window.event;
        var x = a.clientX+d.body.scrollLeft-o.offsetLeft;
        var y = a.clientY+d.body.scrollTop-o.offsetTop;
        //author: www.longbill.cn
        d.ondragstart = "return false;"
        d.onselectstart = "return false;"
        d.onselect = "document.selection.empty();"

        if(o.setCapture)
            o.setCapture();
        else if(window.captureEvents)
            window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);

        d.onmousemove = function(a)
        {
            if(!a)a=window.event;
            o.style.left = a.clientX+document.body.scrollLeft-x;
            o.style.top = a.clientY+document.body.scrollTop-y;
            o.orig_x = parseInt(o.style.left) - document.body.scrollLeft;
            o.orig_y = parseInt(o.style.top) - document.body.scrollTop;
        }

        d.onmouseup = function()
        {
            if(o.releaseCapture)
                o.releaseCapture();
            else if(window.captureEvents)
                window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
            d.onmousemove = null;
            d.onmouseup = null;
            d.ondragstart = null;
            d.onselectstart = null;
            d.onselect = null;
            o.style.cursor = "normal";
            o.style.zIndex = o.orig_index;
        }
    }

    if (s)
    {
        var orig_scroll = window.onscroll?window.onscroll:function (){};
        window.onscroll = function ()
        {
            orig_scroll();
            o.style.left = o.orig_x + document.body.scrollLeft;
            o.style.top = o.orig_y + document.body.scrollTop;
        }
    }
}
</script>

<div id="div1" style="left:10px;top:10px;">div1:我可以被拖动</div>
<div id="div2" style="left:120px;top:10px;background-color : #f3d9ff">div2:来拖我呀</div>
<div id="div3" style="left:230px;top:10px;background-color : #c3ffff">div3:我随便你拖</div>
<div id="div4" style="left:10px;top:120px;background-color : #c3d944">div4:我可以随窗口滑动，把我拖到最下面，然后滚动网页看看</div>
<div id="div5" style="left:120px;top:120px;background-color : #f3d944">作者: Longbill
<a href=http://www.longbill.cn target=_blank>www.longbill.cn</a>
</div>
<div id="div6" style="left:230px;top:120px;background-color : #e3f944;200px;">参数说明:

drag(obj [,scroll]);

obj:对象的id或对象本身;

scroll(可选):对象是否随窗口拖动而滑动，默认为否

鼠标右键查看源代码
</div>

<script>
drag("div1");
drag("div2");
drag("div3");
drag("div4",1);
drag("div5",1);
drag("div6",1);

</script>

</body>