The TouchList interface represents a list of contact points with a touch surface; for example, if the user has three fingers on the touch surface (such as a screen or trackpad), the corresponding TouchList object would have one Touch object for each finger, for a total of three entries.
TouchList接口提供了触摸点的一系列属性值；比如，如果用户用三根手指触摸了触控界面，每个手指对应的TouchList对象将会有一个Touch对象。
TouchList.length Read only
Touch objects in the TouchList.TouchList.identifiedTouch()
Touch item in the list whose identifier matches a specified value.TouchList.item()Touch object at the specified index in the list.See the example on the main Touch events article.
| Specification | Status | Comment |
|---|---|---|
| Touch Events – Level 2 | Editor's Draft | Non-stable version. |
| Touch Events | Recommendation | Initial definition. |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 22.0 |
18.0 (18.0)[1] 52.0 (52.0)[2] | No support | No support | No support |
| Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | 6.0 (6.0) | (Yes) | 11 | (Yes) | (Yes) |
[1] Touch events were implemented in Gecko 18.0, but removed again in 24.0 (Firefox 24.0 / Thunderbird 24.0 / SeaMonkey 2.21) on the desktop version of Firefox due to web compatibility issues (bug 888304).
[2] As of Gecko 52.0, touch events support has been fixed and reenabled in Windows desktop platforms.
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https://developer.mozilla.org/en-US/docs/Web/API/TouchList