媒体查询常用样式表：
```html
<link rel="stylesheet" media="all and (orientation:portrait)" href="portrait.css"> // 竖放加载
<link rel="stylesheet" media="all and (orientation:landscape)"href="landscape.css"> // 横放加载
```
竖屏时使用的样式
```html
<style media="all and (orientation:portrait)" type="text/css">
#landscape { display: none; }
</style>
```
//横屏时使用的样式
```html
<style media="all and (orientation:landscape)" type="text/css">
#portrait { display: none; }
</style>
```