设计模式（二）——创建型：工厂模式-区分变与不变
浅谈构造器
构造器代码示例：
class User {
name: string;
age: number;
carrer: string;
constructor(name: string, age: number, career: string) {
this.name = name;
this.age = age;
this.carrer = career;
}
}
const user = new User("suxiong", 24, "...
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