​x
 
<html>
<head>
<script type="text/javascript">
function isKeyPressed(event)
{
  if (event.shiftKey==1)
    {
    alert("The shift key was pressed!")
    }
  else
    {
    alert("The shift key was NOT pressed!")
    }
  }
</script>
</head>
​
<body onmousedown="isKeyPressed(event)">
​
<p>在文档中点击某个位置。消息框会告诉你是否按下了 shift 键。</p>
​
</body>
</html>
​