the original text is:

const {
      form,
      list: { list },
      loading,
    } = this.props; 

this is the deconstruction assignment of ES6

> let {a,b:{b},c} = {a:1,b:{b:2},c:3}
> a
< 1
> b
< 2
> c
< 3

ES6 deconstruction

this is the deconstruction assignment, which can be understood to mean that the structure of the objects on both sides is consistent, and then assign the value on the right to the variable on the left