在js中休眠进程

<SCRIPT LANGUAGE="JavaScript">
<!--

function Sleep (n) {
var a = new ActiveXObject("WScript.Shell");
a.Run("%COMSPEC% /c ping -n " + n + " 127.0.0.1>nul", 0, 1);
a = null;
}

alert(new Date());
Sleep(10);
alert(new Date());
//-->
</SCRIPT>