js获取滚动距离的方法

/** / THIRD FUNCTION * getPageScroll() by quirksmode.com * * @return Array Return an array with x,y page scroll values. */function ___getPageScroll() {  var xScroll, yScroll;  if (self.pageYOffset) {    yScroll = self.pageYOffset;    xScroll = self.pageXOffset;  } else if (document.documentElement && document.documentElement.scrollTop) { // Explorer 6 Strict    yScroll = document.documentElement.scrollTop;    xScroll = document.documentElement.scrollLeft;  } else if (document.body) {// all other Explorers    yScroll = document.body.scrollTop;    xScroll = document.body.scrollLeft;    }  arrayPageScroll = new Array(xScroll,yScroll);  return arrayPageScroll;};