JS获取滚动条高度

function getPageScroll(){
 
var yScroll;
if (self.pageYOffset) {
yScroll = self.pageYOffset;
        //xScroll = self.pageXOffset;
} else if (document.documentElement && document.documentElement.scrollTop){
yScroll = document.documentElement.scrollTop;
} else if (document.body) {
yScroll = document.body.scrollTop;
}
//arrayPageScroll = new Array('',yScroll)

 
return yScroll;
}