MouseEvent.altKey
read-only property is a
布尔
that indicates whether the
alt
key was pressed or not when a given mouse event occurs.
Be aware that the browser can't always detect the alt key on some operating systems. On some Linux variants, for example, a left mouse click combined with the alt key is used to move or resize windows.
注意： On Macintosh keyboards, this key is also known as the option key.
var altKeyPressed = instanceOfMouseEvent.altKey
A
布尔
，其中
true
indicates that the key is pressed, and
false
indicates that the key is
not
pressed.
This example logs the
altKey
property when you trigger a
click
事件。
<p>Click anywhere to test the <code>altKey</code> property.</p> <p id="log"></p>
let log = document.querySelector('#log');
document.addEventListener('click', logKey);
function logKey(e) {
log.textContent = `The alt key is pressed: ${e.altKey}`;
}
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
altKey
|
Chrome Yes | Edge 12 | Firefox Yes | IE Yes | Opera Yes | Safari Yes | WebView Android Yes | Chrome Android Yes | Firefox Android Yes | Opera Android Yes | Safari iOS Yes | Samsung Internet Android Yes |
完整支持
MouseEvent