KeyboardEvent.altKey

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

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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 或 ⌥ 键) 是 (true) 否 (false) 被按下。

值

一个布尔值。

示例

<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

参考

KeyboardEvent