How can this multi-dimensional array disrupt that the output is empty?

encountered a problem in development. The requested data looks like this

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:

1


2


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!
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setData:

let query = new wx.BaaS.Query()
    let Product = new wx.BaaS.TableObject(56136)
    Product.find().then(res => {
      res.data.objects.sort((a, b) => {
        return (Math.random() - .5) > 0 ? -1 : 1;
      });
      this.setData({
        bank: res.data.objects
      })
      this.setData({
        show: this.showlistID(0, this.data.bank.length - 1)
      })
      console.log(this.data.bank)


    }, err => {
      // err
    })
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