metaKey 事件属性可返回一个布尔值，指示当事件发生时，"meta" 键是否被按下并保持住。
event.metaKey
下面的例子可提示当鼠标按键被点击时 "meta" 键是否被按住：
运行一下 »<html>
<head>
<script>
function isKeyPressed(event)
{
if (event.metaKey==1)
{
alert("The meta key was pressed!")
}
else
{
alert("The meta 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 meta key or not.</p>
</body>
</html>