需安装reflect-metadata库以支持Reflect.metadata
    参考:https://github.com/typestack/class-transformer

    1. import { plainToClass, Expose, Type } from "class-transformer";
    2. import "reflect-metadata";
    3. class Addr {
    4.   @Expose()
    5.   provience!: string;
    6.   @Expose()
    7.   city!: string;
    8.   get all() {
    9.     return this.provience + "." + this.city;
    10.   }
    11. }
    13. class User {
    14.   @Expose()
    15.   name!: string;
    16.   @Expose()
    17.   sex!: string;
    18.   @Expose()
    19.   age!: string;
    20.   @Type(() => Addr)
    21.   @Expose()
    22.   addr!: Addr;
    23.   get description() {
    24.     return `${this.name}  ${this.sex}  ${this.age}岁`;
    25.   }
    26. }
    28. const resList = [
    29.   {
    30.     name: "liu",
    31.     sex: "m",
    32.     age: 25,
    33.     job: "javascript",
    34.     addr: { provience: "SiChuan", city: "ChengDu" },
    35.   },
    36.   {
    37.     name: "xie",
    38.     sex: "f",
    39.     age: 21,
    40.     addr: { provience: "SiChuan", city: "ChengDu" },
    41.   },
    42. ];
    43. let users = plainToClass(User, resList, { excludeExtraneousValues: true });
    44. console.log(users);
    45. console.log(users[0].addr.all)