//index.js
//获取应用实例
var app = getApp();
Page({
    data: {
        indicatorDots: true,
        autoplay: true,
        interval: 3000,
        duration: 1000,
        loadingHidden: false, // loading
        swiperCurrent: 0,
        categories: [],
        activeCategoryId: 0,
        goods: [],
        scrollTop: "0",
        loadingMoreHidden: true,
        searchInput: '',
    },
    onLoad: function () {
        var that = this;

        wx.setNavigationBarTitle({
            title: app.globalData.shopName
        });

        that.setData({
            banners: [
                {
                    "id": 1,
                    "pic_url": "/images/food.jpg"
                },
                {
                    "id": 2,
                    "pic_url": "/images/food.jpg"
                },
                {
                    "id": 3,
                    "pic_url": "/images/food.jpg"
                }
            ],
            categories: [
                {id: 0, name: "全部"},
                {id: 1, name: "川菜"},
                {id: 2, name: "东北菜"},
            ],
            activeCategoryId: 0,
            goods: [
                {
                    "id": 1,
                    "name": "小鸡炖蘑菇-1",
                    "min_price": "15.00",
                    "price": "15.00",
                    "pic_url": "/images/food.jpg"
                },
                {
                    "id": 2,
                    "name": "小鸡炖蘑菇-1",
                    "min_price": "15.00",
                    "price": "15.00",
                    "pic_url": "/images/food.jpg"
                },
                {
                    "id": 3,
                    "name": "小鸡炖蘑菇-1",
                    "min_price": "15.00",
                    "price": "15.00",
                    "pic_url": "/images/food.jpg"
                },
                {
                    "id": 4,
                    "name": "小鸡炖蘑菇-1",
                    "min_price": "15.00",
                    "price": "15.00",
                    "pic_url": "/images/food.jpg"
                }

            ],
            loadingMoreHidden: false
        });

        this.getBannerAndCat();
    },
    scroll: function (e) {
        var that = this, scrollTop = that.data.scrollTop;
        that.setData({
            scrollTop: e.detail.scrollTop
        });
    },
    //事件处理函数
    swiperchange: function (e) {
        this.setData({
            swiperCurrent: e.detail.current
        })
    },
    listenerSearchInput: function (e) {
        this.setData({
            searchInput: e.detail.value
        });
    },
    toSearch: function (e) {
        this.setData({
            p: 1,
            goods: [],
            loadingMoreHidden: true
        });
        this.getFoodList();
    },
    tapBanner: function (e) {
        if (e.currentTarget.dataset.id != 0) {
            wx.navigateTo({
                url: "/pages/food/info?id=" + e.currentTarget.dataset.id
            });
        }
    },
    toDetailsTap: function (e) {
        wx.navigateTo({
            url: "/pages/food/info?id=" + e.currentTarget.dataset.id
        });
    },
    getBannerAndCat: function () {
        var that = this;
        wx.request({
            url: app.buildUrl("/food/index"),
            header: app.getRequestHeader(),
            success: function (res) {
                var resp = res.data;
                if (resp.code != 200) {
                    app.alert({"content": resp.msg});
                    return;
                }
                that.setData({
                    banners: resp.data.banner_list,
                    categories: resp.data.cat_list
                });
            }
        })
    }
});

而且在that.setData({
banners: resp.data.banner_list,
categories: resp.data.cat_list
});
代码好像获取不到banner_list，cat_list
下面是api中的food.py里面的代码

@route_api.route("/food/index")
def foodIndex():
    resp = {'code': 200, 'msg': '操作成功~', 'data': {}}
    cat_list = FoodCat.query.filter_by(status=1).order_by(FoodCat.weight.desc()).all()
    data_cat_list = []
    data_cat_list.append({
        'id': 0,
        'name': "全部"
    })
    if cat_list:
        for item in cat_list:
            tmp_data = {
                'id': item.id,
                'name': item.name
            }
            data_cat_list.append(tmp_data)
    resp['data']['cat_list'] = data_cat_list

    food_list = Food.query.filter_by(status=1) \
        .order_by(Food.total_count.desc(), Food.id.desc()).limit(3).all()

    data_food_list = []
    if food_list:
        for item in food_list:
            tmp_data = {
                'id': item.id,
                'pic_url': UrlManager.buildImageUrl(item.main_image)
            }
            data_food_list.append(tmp_data)

    resp['data']['banner_list'] = data_food_list
    return jsonify(resp)