javascript - Ajax调用返回函数而不是数据

Question

我使用 jquery $ajax 调用发出请求，但它返回回调函数本身，而不是正确的数据响应，并显示消息“ReferenceError:recapCB 未定义”；

var recapMonthDEF = $.ajax({
        type: 'get',
        url: getAnalyticsApiURL('recapMonth'),
        dataType: 'jsonp',
        contentType: "application/json",
    });

    $.when(lastMonthSessionsDEF, recapMonthDEF).always(function(){
        $('#Dashboard-tabs-1 .toggle input[type="checkbox"]').removeAttr('disabled');
    });

    recapMonthDEF.always(recapCB);



    var recapCB = function(response){

        if($('#newUsers').length == 0) return;

        data = response;

        var percent = parseFloat(parseFloat(data.percentNewSessions).toFixed(1));
        var percentDiff = parseFloat((100 - percent).toFixed(1));

        var sessionDuration = moment().startOf('day').seconds(data.sessionDuration).format('H:mm:ss');

        $('#analitycs-session').html(data.sessions);
        $('#analitycs-users').html(data.users);
        $('#analitycs-pageviews').html(data.pageviews);
        $('#analitycs-sessionsPerUser').html(parseFloat(data.sessionsPerUser).toFixed(2));
        $('#analitycs-sessionDuration').html(sessionDuration);
        $('#analitycs-newUsers').html(data.newUsers);

    };

截图

Answer 1

but it returns the callback function itself

您的屏幕截图未显示回调函数。它显示了一个 jqXHR 对象。

请参阅documentation :

jqXHR.always(function( data|jqXHR, textStatus, jqXHR|errorThrown ) { }); (added in jQuery 1.6)
An alternative construct to the complete callback option, the .always() method replaces the deprecated .complete() method.

In response to a successful request, the function's arguments are the same as those of .done(): data, textStatus, and the jqXHR object. For failed requests the arguments are the same as those of .fail(): the jqXHR object, textStatus, and errorThrown. Refer to deferred.always() for implementation details.

由于您正在获取 jqXHR 对象，因此您必须触发错误状态。

这很可能是因为您使用的 URL 未提供 JSONP 响应。

<小时/>

ReferenceError: recapCB is not defined

您在尝试使用之后行上定义recapCB。