KeyboardEvent.altKey - Web APIs 编辑
The KeyboardEvent.altKey read-only property is a Boolean that indicates if the alt key (Option or ⌥ on OS X) was pressed (true) or not (false) when the event occurred.
Syntax
var altKeyPressed = instanceOfKeyboardEvent.altKey
Return value
Examples
<html>
<head>
<title>altKey example</title>
<script type="text/javascript">
function showChar(e){
alert(
"Key KeyDown: " + String.fromCharCode(e.charCode) + "\n"
+ "charCode: " + e.charCode + "\n"
+ "ALT key KeyDown: " + e.altKey + "\n"
);
}
</script>
</head>
<body onkeydown="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>Specifications
| Specification | Status | Comment |
|---|---|---|
| Document Object Model (DOM) Level 3 Events Specification The definition of 'KeyboardEvent.altkey' in that specification. | Obsolete | Initial definition. |
Browser compatibility
BCD tables only load in the browser
See also
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