如何在浏览器上检查真实的触摸支持

问题描述

今天（或最近）Chrome Beta更新为17，对我而言，我注意到我的网络应用程序有一些乐趣。我注意到这是因为一个类被添加到body元素中，通常只有在触摸事件支持的情况下才会被放在那里，我检查这样：

Today (or very recently) Chrome Beta updated to 17 for me and with it i noticed some funkiness in my web app. I noticed it was because a class was being added to the body element that normally only gets put there if there is touch event support which I check like this:

  try {
    document.createEvent("TouchEvent");
    _device.touch = true;
  } catch (e) {
    _device.touch = false;
  }

确实，我可以在Chrome 17上创建和触发触摸事件。我的想法是，哦，我可以检查触摸，看看是否鼠标点击失败，因此，有一个鼠标，但是MouseEvents也触发。

And sure enough, i can create and trigger touch events on Chrome 17. First idea i had was, oh, i can check for touch, and see if a mouse click fails, therefore, there's a mouse, but MouseEvents trigger too.

我检查，没有用户代理嗅探，它是一个实际的，可触摸的设备，而不仅仅是支持触摸事件的浏览器。

How else can I check, without user agent sniffing, that it's an actual, touchable, device, and not just a browser that supports touch events.

推荐答案

p>尝试：

'ontouchstart' in document.documentElement

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