Implementation of a small program using setData to modify a certain value in an array

The content of this article is about the implementation of a small program using setData to modify a certain value in an array. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The official document is like this:

 changeItemInArray: function() {
    // you can use this way to modify a danamic data path
    this.setData({
      'array[0].text':'changed data'
    })
  },
  changeItemInObject: function(){
    this.setData({
      'object.text': 'changed data'
    });
  },

Unfortunately, when you write it yourself, you will still encounter problems that cannot be solved, such as

 this.setData({
      'array[0].text':'changed data'
    })

the arry[o ] is dynamic, 'array[index].text', like this is obviously not possible. I searched on the Internet, but I don't know why, so I recorded it here.
For example, if you want to modify the value of that.data.goods[0].price, you can do it like this,
This is a dynamic variable

var price = 'goods['+index+'].price'

 this.setData({
      [price]:'changed data'
    })

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