javascript显示驱动是否准备就绪IsReady

<script language="javascript" type=text/javascript>
 function ShowDriveInfo(driver)
{
   var fso, d, s, t;
   fso = new ActiveXObject("Scripting.FileSystemObject");
   d = fso.GetDrive(driver);      //GetDrive()函数返回相应于指定路径中驱动器的 Drive 对象
   s = "磁盘 " + d.DriveLetter + ": - " ;         //d.DriveLetter:返回一个物理上的本地驱动器或者网络共享的驱动器号,只读属性.
   if (d.IsReady)                                    //d.IsReady:如果指定驱动器已就绪则返回 True ；否则 False。
      s +=  "驱动器就绪<br>";
   else
      s +=  "驱动器未准备好<br>";
   return(s);
}
var driver="c";    //驱动器(盘符)
document.write(ShowDriveInfo(driver));
var driver="d:";    //驱动器(盘符)
document.write(ShowDriveInfo(driver));
</script>
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