摘要

A 布尔 value indicating whether or not the alt (Alternate) key is enabled when the touch event is created. If the alt key is enabled, the attribute's value is true . Otherwise, it is false .

此特性是 只读 .

句法

var altEnabled = touchEvent.altKey;
					

返回值

altEnabled
true alt key is enabled for this event; and false alt is not enabled.

范例

This example illustrates how to access the TouchEvent key modifier properties: TouchEvent.altKey , TouchEvent.ctrlKey , TouchEvent.metaKey and TouchEvent.shiftKey .

In following code snippet, the touchstart event handler logs the state of the event's modifier keys.

someElement.addEventListener('touchstart', function(e) {
   // Log the state of this event's modifier keys
   console.log("altKey = " + e.altKey);
   console.log("ctrlKey = " + e.ctrlKey);
   console.log("metaKey = " + e.metaKey);
   console.log("shiftKey = " + e.shiftKey);
}, false);
					

规范

规范 状态 注释
Touch Events – Level 2 草案 非稳定版本。
触摸事件 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
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

图例

完整支持

完整支持

不支持

不支持

元数据

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