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MouseEvent.ctrlKey
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
MouseEvent.ctrlKey 是只读属性，可返回一个布尔值，当 ctrl 键被按下，返回 true，否则返回 false。
语法
var ctrlKeyPressed = instanceOfMouseEvent.ctrlKey
返回值
A boolean
示例
js
<html><head><title>ctrlKey example</title><script type="text/javascript">function showChar(e){ alert( "Key Pressed: " + String.fromCharCode(e.charCode) + "\n" + "charCode: " + e.charCode + "\n" + "CTRL key pressed: " + e.ctrlKey + "\n" );}</script></head><body onkeypress="showChar(event);"><p>Press any character key, with or without holding down the CTRL key.<br />You can also use the SHIFT key together with the CTRL key.</p></body></html>规范
| Specification |
|---|
| UI Events # dom-mouseevent-ctrlkey |