<meta name="screen-orientation" content="portrait"><!-- uc强制竖屏 -->
<meta name="x5-orientation" content="portrait"><!-- QQ强制竖屏 -->

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  window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", hengshuping, false);
  
  
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  function hengshuping() {
  
  
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          if (window.orientation == 90 || window.orientation == -90) {
  
  
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             //横屏
  
  
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          } else {
  
  
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              //竖屏
  
  
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          }
  
  
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      }
  
  
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奈斯，加油