js判断屏幕横竖屏:

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function orient() {
//alert('gete');
if (window.orientation == 0 || window.orientation == 180) {
$("body").attr("class", "portrait");
orientation = 'portrait';
return false;
}
else if (window.orientation == 90 || window.orientation == -90) {
$("body").attr("class", "landscape");
orientation = 'landscape';
return false;
}
}

$(function(){
orient();
});

$(window).bind( 'orientationchange', function(e){
orient();
});

ipad: 90 或 -90 横屏

ipad: 0 或180 竖屏

Andriod:0 或180 横屏

Andriod: 90 或 -90 竖屏

iphone 、ipad禁止横竖屏切换、强制横竖屏