MouseEvent.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.

MouseEvent.altKey 只读属性是一个Boolean变量。当事件触发时，如果alt 被按下，则返回 true，否则返回 false。

语法

var altKeyPressed = instanceOfMouseEvent.altKey

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-mouseevent-altkey

浏览器兼容性

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