use ref in class

[luckjoke]

class Class1 {
  item = ref([])
  sub_class = new Class2()
  setItem(value) {
    this.item.value = value
  }
  getItem(value) {
    return this.item.value
  }
}
class Class2 {
  item = ref([])
    setItem(value) {
    this.item.value = value
  }
  getItem(value) {
    return this.item.value
  }
}

I try to use ref in class. When using in Class1, it's ok. But in Class2, this.item.value is undefine and can only get and set on this.item. There may be some mistakes in my usage. I just wondering why the two behave differently.

[Andy-d-g]

Same issue

[L0st1]

it is not a problem with ref, you need to use constructor() or extends when you want to use another instance object.
And you'd better make sure that Class2 is defined before calling