去后台数据数据返回0条

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result: []

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result: Array(10)

0: {categoryId: 0, category: "电视", titleId: 0, _id: "5806e6ea48985cb016b082e8", __v: 0}

1: {categoryId: 1, category: "空调", titleId: 0, _id: "5806e6ea48985cb016b082e9", __v: 0}

2: {categoryId: 2, category: "影院", titleId: 0, _id: "5806e6ea48985cb016b082ea", __v: 0}

3: {categoryId: 3, category: "冰箱", titleId: 0, _id: "5806e6ea48985cb016b082eb", __v: 0}

4: {categoryId: 4, category: "DVD", titleId: 0, _id: "5806e6ea48985cb016b082ec", __v: 0}

5: {categoryId: 5, category: "音响/音箱", titleId: 0, _id: "5806e6ea48985cb016b082ed", __v: 0}

6: {categoryId: 6, category: "洗衣机", titleId: 0, _id: "5806e6ea48985cb016b082ee", __v: 0}

7: {categoryId: 7, category: "热水器", titleId: 0, _id: "5806e6ea48985cb016b082ef", __v: 0}

8: {categoryId: 8, category: "酒柜/冰吧/冷柜", titleId: 0, _id: "5806e6ea48985cb016b082f0", __v: 0}

9: {categoryId: 9, category: "消毒柜/洗碗机", titleId: 0, _id: "5806e6ea48985cb016b082f1", __v: 0}

length: 10

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