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);
            }
        }
    });