正确实例化复杂的JS对象

Question

我正在通过Web服务获取数据，我想用地址对象填充我的对象User。

尝试为对象this.user.address.residentialAddress分配值时，我正在

  

错误类型错误：无法设置未定义的属性“residentialAddress”

尝试使用构造函数进行实例化时会应用相同的错误。 简单的console.log（this.user.address.residentialAddress.City）;输出值。

我的猜测是我没有正确创建对象，但我看不到解决方案？

private user: MyUser;
...
this.user = new MyUser();

this.user.address.residentialAddress = {
          City: data.address.residentialAddress.City,
          StreetAddress: data.address.residentialAddress.StreetAddress,
          Suburb: data.address.residentialAddress.Suburb,
          Province: data.address.residentialAddress.Province
};       


export class Address {    
    public StreetAddress: string;
    public Suburb: string;
    public City: string;
    public Province: string;

    constructor(street: string, suburb: string, city: string, province: string){
        this.StreetAddress = street;
        this.Suburb = suburb;
        this.City = city;
        this.Province = province;
    }
}

export class MyUser {    
    address: {
        residentialAddress: Address;
        postalAddress: Address;
    }
    ....

}

Answer 1

我认为你应该在构造函数中添加地址：

ant clean all

这样可以在实例化后定义ant modulegen并且export class MyUser { public address: object; constructor(){ this.address = { residentialAddress: Address; postalAddress: Address; } } } 应该消失。

Answer 2

private user: MyUser;
...
this.user = new MyUser();

////////////////////////////////////////////////////
/////// Add this line `this.user.address = {}`
////////////////////////////////////////////////////
this.user.address = {}

this.user.address.residentialAddress = {
          City: data.address.residentialAddress.City,
          StreetAddress: data.address.residentialAddress.StreetAddress,
          Suburb: data.address.residentialAddress.Suburb,
          Province: data.address.residentialAddress.Province
};       


export class Address {    
    public StreetAddress: string;
    public Suburb: string;
    public City: string;
    public Province: string;

    constructor(street: string, suburb: string, city: string, province: string){
        this.StreetAddress = street;
        this.Suburb = suburb;
        this.City = city;
        this.Province = province;
    }
}

export class MyUser {    
    address: {
        residentialAddress: Address;
        postalAddress: Address;
    }
    ....

}