简介

由一个工厂对象决定创建某一种产品对象类的实例，主要用来创建同一类对象。

ES5

function UserFactory(role) {
  function User(role, pages) {
    this.role = role;
    this.pages = pages;
  }

  switch (role) {
    case "superadmin":
      return new User("superadmin", [
        "home",
        "user-manage",
        "right-manage",
        "news-manage",
      ]);
      break;

    case "admin":
      return new User("admin", ["home", "user-manage", "news-manage"]);
      break;

    case "editor":
      return new User("editor", ["home", "news-manage"]);
      break;

    default:
      throw new Error("参数错误");
  }
}

let user = new UserFactory("admin");

ES6

class User {
  constructor(role, pages) {
    this.pole = role;
    this.pages = pages;
  }

  static UserFactory(role) {
    switch (role) {
      case "superadmin":
        return new User("superadmin", [
          "home",
          "user-manage",
          "right-manage",
          "news-manage",
        ]);
        break;

      case "admin":
        return new User("admin", ["home", "user-manage", "news-manage"]);
        break;

      case "editor":
        return new User("editor", ["home", "news-manage"]);
        break;

      default:
        throw new Error("参数错误");
    }
  }
}

let user = User.UserFactory("admin");