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。

语法

var altKeyPressed = instanceOfKeyboardEvent.altKey

返回值

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>

标准

Specification Status Comment
Document Object Model (DOM) Level 3 Events Specification
KeyboardEvent.altkey
Obsolete Initial definition.

浏览器兼容性

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特性
Edge Firefox (Gecko) Chrome Internet Explorer Opera Safari
基本支持 (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
特性
Edge Firefox Mobile (Gecko) Android IE Mobile Opera Mobile Safari Mobile
基本支持 (Yes) ? ? ? ? ?

参考

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