我需要一个脚本来检测所有浏览器上的所有长按或连续按

autoComplete.prototype.keyDown=function(oEvent)
 {
    oEvent=window.event || oEvent;
    iKeyCode=oEvent.keyCode;

    switch(iKeyCode)
    {
       case 38: //up arrow
          this.autoComplete.moveUp();
          break;
       case 40: //down arrow
          this.autoComplete.moveDown();
          break;
       case 13: //return key
          window.focus();
          break;
       case 27: //escape key
          this.autoComplete.oDiv.style.display=\"none\";
          break;
    }
 };