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 Mac

xScroll = document.body.scrollWidth;

yScroll = document.body.scrollHeight;

} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari

xScroll = document.body.offsetWidth;

yScroll = document.body.offsetHeight;

}

var windowWidth, windowHeight;

if (self.innerHeight) { // all except Explorer

windowWidth = self.innerWidth;

windowHeight = self.innerHeight;

} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode

windowWidth = document.documentElement.clientWidth;

windowHeight = document.documentElement.clientHeight;

} else if (document.body) { // other Explorers

windowWidth = document.body.clientWidth;

windowHeight = document.body.clientHeight;

}

// for small pages with total height less then height of the viewport

if(yScroll < windowHeight){

pageHeight = windowHeight;

} else {

pageHeight = yScroll;

}

// for small pages with total width less then width of the viewport

if(xScroll < windowWidth){

pageWidth = windowWidth;

} else {

pageWidth = xScroll;

}

arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)

return arrayPageSize;

}

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// for small pages with total height less then height of the viewport

if(yScroll < windowHeight){

pageHeight = yScroll;

} else {

pageHeight = windowHeight;

}

// for small pages with total width less then width of the viewport

if(xScroll < windowWidth){

pageWidth = xScroll;

} else {

pageWidth = windowWidth;

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