// 设置Ajax操作的默认设置     $.ajaxSetup({         cache: false,          error: function (XMLHttpRequest, textStatus, errorThrown) {             if( typeof(errorThrown) != "undefined" )                 $.messager.alert(g_MsgBoxTitle, "调用服务器失败。<br />" + errorThrown ,'error');             else{                 var error = "<b style='color: #f00'>" + XMLHttpRequest.status + "  " + XMLHttpRequest.statusText + "</b>";                 var start = XMLHttpRequest.responseText.indexOf("<title>");                 var end = XMLHttpRequest.responseText.indexOf("</title>");                 if( start > 0 && end > start )                     error += "<br /><br />" + XMLHttpRequest.responseText.substring(start + 7, end);                     $.messager.alert(g_MsgBoxTitle, "调用服务器失败。<br />" + error ,'error');             }         }     });