设置默认Ajax操作cache and error

    // 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');
            }
        }
    });

这样在ajax方法中你就可以不要写error处理函数了