//设置内容区域合适高度
    var docH = $(document).height(),
        winH = $(window).height(),
        headerH = $(".header").outerHeight();
        footerH = $(".footer").outerHeight();
    if(docH<=winH+4){
        $("div.container").height(winH-headerH-footerH-50);
    }

// 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;//www.111cn.net

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();