Screen.orientation

orientation 是 Screen 接口的一个只读属性，返回屏幕当前的方向。

语法

var orientation = window.screen.orientation;

返回值

一个 ScreenOrientation 的实例，表示屏幕的方向。

注意在更早的、有前缀的版本中会返回一个 DOMString 值，相当于 ScreenOrientation.type 的值。

示例

var orientation = (screen.orientation || {}).type || screen.mozOrientation || screen.msOrientation;

if (orientation === "landscape-primary") {
  console.log("That looks good.");
} else if (orientation === "landscape-secondary") {
  console.log("Mmmh... the screen is upside down!");
} else if (orientation === "portrait-secondary" || orientation === "portrait-primary") {
  console.log("Mmmh... you should rotate your device to landscape");
} else if (orientation === undefined) {
  console.log("The orientation API isn't supported in this browser :("); 
}

规范

浏览器兼容性

参见

• ScreenOrientation
• Screen.onorientationchange
• Managing screen orientation