KeyboardEvent.altKey

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

KeyboardEvent.altKey 只读属性返回一个 Boolean 值,表示事件触发时 alt 键 (OS X 系统上的 Option 键) 是 (true) 否 (false) 被按下。

一个布尔值。

示例

js
<html>
<head>
<title>altKey example</title>

<script type="text/javascript">

function showChar(e){
  alert(
    "Key Pressed: " + String.fromCharCode(e.charCode) + "\n"
    + "charCode: " + e.charCode + "\n"
    + "ALT key pressed: " + e.altKey + "\n"
  );
}

</script>
</head>

<body onkeypress="showChar(event);">
<p>
Press any character key,
with or without holding down the ALT key.<br />
You can also use the SHIFT key together with the ALT key.
</p>
</body>
</html>

规范

Specification
UI Events
# dom-keyboardevent-altkey

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
altKey

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参考