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³õ¼¶ÎÊÌâ function oAjax( url ,callback) {  alert("1");  alert(url);  alert(callback);     try{         this.HttpRequest = null;         this.Debug  = false;         this.Url = url;         this.ContentType = "text/xml";         this.HttpRequest = this.createXMLHttpRequest();         if ( this.HttpRequest == null )         {             this._debug("XMLHttpRequest create failure!");             return;         }         var xhReq = this.HttpRequest;         xhReq.onreadystatechange = function (){             oAjax._OnReadyStateChange( xhReq,callback );         }     } catch(e){        this._debug( "unknow err: " + e.message );     } } ÊÇʲôÒâ˼ѽ    Êղؠ  ·ÖÏí   ¶¥(0)