键盘按键代码捕获代码

<SCRIPT language="JScript">
  <!--
  function keydown()
  {
   if(event.keyCode)
   {
    document.all("keycode").innerText = "You just clicked the No. " + event.keyCode + " key";
   }
  }

  document.onkeydown = keydown;
  -->
  </SCRIPT>