KeyboardEvent.altKey
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
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
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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) | ? | ? | ? | ? | ? |