function orient() {    if (window.orientation == 90 || window.orientation == -90) {        //ipad、iphone竖屏；Andriod横屏        $("body").attr("class", "landscape");        orientation = 'landscape';        return false;    }else if (window.orientation == 0 || window.orientation == 180) {        //ipad、iphone横屏；Andriod竖屏        $("body").attr("class", "portrait");        orientation = 'portrait';        return false;    }}//用户变化屏幕方向时调用$(window).bind( 'orientationchange', function(e){    orient();});