altKey 事件属性
定义和用法
altKey 事件属性返回一个布尔值。指示在指定的事件发生时,Alt 键是否被按下并保持住了。
语法
- event.altKey=true|false|1|0
实例
下面的例子可提示当鼠标按键被点击时 "ALT" 键是否已被按住:
- <html>
- <head>
- <script type="text/javascript">
- function isKeyPressed(event)
- {
- if (
event.altKey==1
)- {
- alert("The ALT key was pressed!")
- }
- else
- {
- alert("The ALT key was NOT pressed!")
- }
- }
- </script>
- </head>
- <body onmousedown="isKeyPressed(event)">
- <p>Click somewhere in the document.
- An alert box will tell you if you
- pressed the ALT key or not.</p>
- </body>
- </html>