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');
            }
        }
    });