TouchEvent | Web API

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构造函数
特性
Touch event types
GlobalEventHandlers
范例
规范
浏览器兼容性
另请参阅
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TouchEvent interface represents an UIEvent which is sent when the state of contacts with a touch-sensitive surface changes. This surface can be a touch screen or trackpad, for example. The event can describe one or more points of contact with the screen and includes support for detecting movement, addition and removal of contact points, and so forth.

Touches are represented by the 触摸 object; each touch is described by a position, size and shape, amount of pressure, and target element. Lists of touches are represented by TouchList 对象。

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构造函数

TouchEvent(): 创建 TouchEvent 对象。

特性

This interface inherits properties from its parent, UIEvent and 事件 .

TouchEvent.altKey 只读
TouchEvent.changedTouches 只读: TouchList of all the 触摸 objects representing individual points of contact whose states changed between the previous touch event and this one.
TouchEvent.ctrlKey 只读
TouchEvent.metaKey 只读
TouchEvent.shiftKey 只读
TouchEvent.targetTouches 只读: TouchList of all the 触摸 objects that are both currently in contact with the touch surface and were also started on the same element that is the target of the event.
TouchEvent.touches 只读: TouchList of all the 触摸 objects representing all current points of contact with the surface, regardless of target or changed status.
TouchEvent.rotation 只读: Change in rotation (in degrees) since the event's beginning. Positive values indicate clockwise rotation; negative values indicate anticlockwise rotation. Initial value: 0.0
TouchEvent.scale 只读: Distance between two digits since the event's beginning. Expressed as a floating-point multiple of the initial distance between the digits at the beginning of the event. Values below 1.0 indicate an inward pinch (zoom out). Values above 1.0 indicate an outward unpinch (zoom in). Initial value: 1.0

Touch event types

There are several types of event that can be fired to indicate that touch-related changes have occurred. You can determine which of these has happened by looking at the event's TouchEvent.type 特性。

`touchstart`

Sent when the user places a touch point on the touch surface. The event's target will be the element in which the touch occurred.

`touchend`

Sent when the user removes a touch point from the surface (that is, when they lift a finger or stylus from the surface). This is also sent if the touch point moves off the edge of the surface; for example, if the user's finger slides off the edge of the screen.

The event's target is the same element that received the touchstart event corresponding to the touch point, even if the touch point has moved outside that element.

The touch point (or points) that were removed from the surface can be found in the TouchList 指定通过 changedTouches 属性。

`touchmove`

Sent when the user moves a touch point along the surface. The event's target is the same element that received the touchstart event corresponding to the touch point, even if the touch point has moved outside that element.

This event is also sent if the values of the radius, rotation angle, or force attributes of a touch point change.

注意： The rate at which


							touchmove

events is sent is browser-specific, and may also vary depending on the capability of the user's hardware. You must not rely on a specific granularity of these events.

`touchcancel`

Sent when a touch point has been disrupted in some way. There are several possible reasons why this might happen (and the exact reasons will vary from device to device, as well as browser to browser):

An event of some kind occurred that canceled the touch; this might happen if a modal alert pops up during the interaction.
The touch point has left the document window and moved into the browser's UI area, a plug-in, or other external content.
The user has placed more touch points on the screen than can be supported, in which case the earliest 触摸 在 TouchList gets canceled.

Using with addEventListener() and preventDefault()

It's important to note that in many cases, both touch and mouse events get sent (in order to let non-touch-specific code still interact with the user). If you use touch events, you should call preventDefault() to keep the mouse event from being sent as well.

The exception to this is Chrome, starting with version 56 (desktop, Chrome for android, and android webview), where the default value for the passive option for touchstart and touchmove is true and calls to preventDefault() will have no effect. To override this behavior, you need to set the passive 选项到 false , after which calling preventDefault() will work as specified. The change to treat listeners as passive by default prevents the listener from blocking page rendering while a user is scrolling. A demo is available on the Google Developer site.

GlobalEventHandlers

GlobalEventHandlers mixin defines these events as global events that are available on any element in the DOM that the user can interact with.

GlobalEventHandlers.ontouchstart: A global event handler 为 touchstart 事件。
GlobalEventHandlers.ontouchend: A global event handler 为 touchend 事件。
GlobalEventHandlers.ontouchmove: A global event handler 为 touchmove 事件。
GlobalEventHandlers.ontouchcancel: A global event handler 为 touchcancel 事件。

范例

见 example on the main Touch events article .

规范

规范	状态	注释
Touch Events – Level 2 The definition of 'TouchEvent' in that specification.	草案	添加 `ontouchstart` , `ontouchend` , `ontouchmove` , `ontouchend` global attribute handlers
触摸事件 The definition of 'TouchEvent' in that specification.	推荐	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`TouchEvent`	Chrome 22	Edge 79 79 不支持 ≤18 — 79 Disabled Disabled From version ≤18 until version 79 (exclusive): this feature is behind the `Standards Preview` preference (needs to be set to `true` ).	Firefox 52 52 不支持 18 — 24 Removed in bug 888304 due to web compatibility issues.	IE No	Opera 15	Safari No	WebView Android ≤37	Chrome Android 25	Firefox Android 6	Opera Android 14	Safari iOS Yes	Samsung Internet Android 1.5
`TouchEvent()` 构造函数	Chrome 48 48 Chrome only supports the following `touchEventInit` 特性： `touches` , `targetTouches` , `changedTouches` .	Edge ≤79 ≤79 Edge only supports the following `touchEventInit` 特性： `touches` , `targetTouches` , `changedTouches` .	Firefox ?	IE No	Opera Yes	Safari No	WebView Android 48 48 Chrome only supports the following `touchEventInit` 特性： `touches` , `targetTouches` , `changedTouches` .	Chrome Android 48 48 Chrome only supports the following `touchEventInit` 特性： `touches` , `targetTouches` , `changedTouches` .	Firefox Android Yes	Opera Android Yes	Safari iOS 3.2	Samsung Internet Android 5.0 5.0 Samsung Internet only supports the following `touchEventInit` 特性： `touches` , `targetTouches` , `changedTouches` .
`altKey`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
`changedTouches`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
`ctrlKey`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
`metaKey`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
`shiftKey`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
`targetTouches`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
`touches`	Chrome 22	Edge ≤18	Firefox 52 52 不支持 18 — 24	IE No	Opera Yes	Safari No	WebView Android Yes	Chrome Android Yes	Firefox Android 6	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

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元数据

最后修改： Jul 27, 2020

触摸事件
TouchEvent
构造函数
1. TouchEvent()
特性
继承：
1. UIEvent
2. 事件
Related pages for Touch Events
1. 触摸
2. TouchList

在此页

构造函数

特性

Touch event types

touchstart

touchend

touchmove

touchcancel