Javascript 如何从 json object 分配多个嵌套的 class 实例

Question

I have a json with the below format:

let js = {
      "a": 1,
      "b": [
        {
          "h": "example",
          "v": 12
        },
        {
          "h": "example1",
          "v": 23
        }
      ]
    }

I have a class that takes in this json from constructor turning it into an instance of this class:

class A{
    constructor (json){
        Object.assign(this, json)
    }
}

This works well with:

a = new A(js)
console.log(f.a)

I have a second class which has the format of the inner list b :

class B {
    construtor(json){
        Object.assign(this, json)
    }
}

How can I instantiate class B from the object passed to A so that fb[0] and fb[1] above would be of type B ?

Answer 1

try this,

 let js = { "a": 1, "b": [{ "h": "example", "v": 12 }, { "h": "example1", "v": 23 } ] } class A { constructor(json) { // create a new b array with instances of class B. json.b = json.b.map(json => new B(json)) Object.assign(this, json) } } class B { constructor(json) { Object.assign(this, json) } } const a = new A(js); console.log({a}); console.log('is ab[0] instance of class B?', ab[0] instanceof B)