准确获得页面、窗口高度及宽度的JS

function getPageSize(){var xScroll, yScroll;if (window.innerHeight && window.scrollMaxY) {xScroll = document.body.scrollWidth;yScroll = window.innerHeight + window.scrollMaxY;} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer MacxScroll = document.body.scrollWidth;yScroll = document.body.scrollHeight;} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and SafarixScroll = document.body.offsetWidth;yScroll = document.body.offsetHeight;}var windowWidth, windowHeight;if (self.innerHeight) { // all except ExplorerwindowWidth = self.innerWidth;windowHeight = self.innerHeight;} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict ModewindowWidth = document.documentElement.clientWidth;windowHeight = document.documentElement.clientHeight;} else if (document.body) { // other ExplorerswindowWidth = document.body.clientWidth;windowHeight = document.body.clientHeight;}// for small pages with total height less then height of the viewportif(yScroll < windowHeight){pageHeight = windowHeight;} else {pageHeight = yScroll;}

// for small pages with total width less then width of the viewportif(xScroll < windowWidth){pageWidth = windowWidth;} else {pageWidth = xScroll;}

arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)return arrayPageSize;}