jQuery 获取屏幕高度、宽度

做手机Web开发做浏览器兼容用到了，所以在网上找了些汇总下。alert($(window).height()); //浏览器当前窗口可视区域高度 
alert($(document).height()); //浏览器当前窗口文档的高度 
alert($(document.body).height());//浏览器当前窗口文档body的高度 
alert($(document.body).outerHeight(true));//浏览器当前窗口文档body的总高度 包括border padding margin 
alert($(window).width()); //浏览器当前窗口可视区域宽度 
alert($(document).width());//浏览器当前窗口文档对象宽度 
alert($(document.body).width());//浏览器当前窗口文档body的高度 
alert($(document.body).outerWidth(true));//浏览器当前窗口文档body的总宽度 包括border padding margin // 获取页面的高度、宽度
function getPageSize() {var xScroll, yScroll;if (window.innerHeight && window.scrollMaxY) {xScroll = window.innerWidth + window.scrollMaxX;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    if (document.documentElement.clientWidth) {windowWidth = document.documentElement.clientWidth;} else {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 = xScroll;} else {pageWidth = windowWidth;}arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);return arrayPageSize;
}// 滚动条
document.body.scrollTop;
$(document).scrollTop();