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function getScrollTop()
{
    var scrollTop=0;
    if(document.documentElement&&document.documentElement.scrollTop)
    {
        scrollTop=document.documentElement.scrollTop;
    }
    else if(document.body)
    {
        scrollTop=document.body.scrollTop;
    }
    return scrollTop;
}
/********************
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function getClientHeight()
{
    var clientHeight=0;
    if(document.body.clientHeight&&document.documentElement.clientHeight)
    {
        var clientHeight = (document.body.clientHeight<document.documentElement.clientHeight)?document.body.clientHeight:document.documentElement.clientHeight;       
    }
    else
    {
        var clientHeight = (document.body.clientHeight>document.documentElement.clientHeight)?document.body.clientHeight:document.documentElement.clientHeight;   
    }
    return clientHeight;
}
/********************
 * È¡ÎĵµÄÚÈÝʵ¼Ê¸ß¶È
 *******************/
function getScrollHeight()
{
    return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
}
////////////////////////////////////////////////////
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document.body.clientHeight ==> BODY¶ÔÏó¸ß¶È
document.documentElement.clientWidth ==> ¿É¼ûÇøÓò¿í¶È
document.documentElement.clientHeight ==> ¿É¼ûÇøÓò¸ß¶È
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