移動端判斷橫屏豎屏

1. CSS判斷橫屏豎屏

寫在同一個CSS中

@media screen and (orientation: portrait) {
　　/*豎屏 css*/
}
@media screen and (orientation: landscape) and (min-width:450px){
　　/*橫屏 css*/
}
分開寫在2個CSS

豎屏
<link rel="stylesheet" media="all and (orientation:portrait)" href="portrait.css">

橫屏
<link rel="stylesheet" media="all and (orientation:landscape)" href="landscape.css">

2. JS判斷橫屏豎屏

var sEvent = "onorientationchange" in window ? "orientationchange" : "resize";
window.addEventListener(sEvent, function() {if (window.orientation === 180 || window.orientation === 0) { alert('豎屏狀態！');} if (window.orientation === 90 || window.orientation === -90 ){ alert('橫屏狀態！');}  
}, false); 

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