检测设备是否能够在 JavaScript 中改变方向
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Detecting if a device is able to change orientation in JavaScript
提问by Shadi Almosri
Is there a native JavaScript (or through the use of a library such as JQuery/Modernizr etc) way to detect if a device is capable of changing orientation? I would like to use that as a method to differentiate between desktop and mobile.
是否有原生 JavaScript（或通过使用 JQuery/Modernizr 等库）的方式来检测设备是否能够改变方向？我想用它作为区分桌面和移动设备的方法。
Thanks,
谢谢，
Shadi
沙迪
回答by Matt Coughlin
Detecting mobile devices:
检测移动设备：
Simple browser sniffing
if (/mobile/i.test(navigator.userAgent)) {...}jQuery.browser.mobileplug-in (exhaustive browser sniffing)
Simple test for touch events
if ('ontouchstart' in window) {...}Advanced test for touch events:
if (('ontouchstart' in window) || // Advanced test for touch events (window.DocumentTouch && document instanceof DocumentTouch) || ((hash['touch'] && hash['touch'].offsetTop) === 9)) {...}
简单的浏览器嗅探
if (/mobile/i.test(navigator.userAgent)) {...}jQuery.browser.mobile插件（穷尽浏览器嗅探）
触摸事件的简单测试
if ('ontouchstart' in window) {...}触摸事件的高级测试：
if (('ontouchstart' in window) || // Advanced test for touch events (window.DocumentTouch && document instanceof DocumentTouch) || ((hash['touch'] && hash['touch'].offsetTop) === 9)) {...}
Optionally use onorientationchangefor #3 and #4 above.
可选地onorientationchange用于上面的#3 和#4。
Combine 1 or more of these (and any other approaches) as needed. None of them are foolproof.
根据需要组合其中一个或多个（以及任何其他方法）。它们都不是万无一失的。
