js如何强制竖屏

1、单纯安卓手机只需设置meta值

<meta name="msapplication-tap-highlight" content="no">

此设置只对安卓机有用，苹果机没效果

2、js判断屏幕横竖屏：

判断window.orientation值,90/-90,为横屏

      window.orientation值,0/180,为竖屏

竖屏时不做任何操作,横屏时移除class:    landscape

function orient() {        //;     

   if (window.orientation == 0 || window.orientation == 180)          

   return false;        

}        else if (window.orientation == 90 || window.orientation == -90) {    

        $("body").attr("class", "landscape"); //当横屏的时候为body移除这个class         

   orientation = 'landscape';              

 return false;      

  }    }

3、   调用方法: orient();

 $(function(){      

  orient();  

  });          

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

   orient();  

  });