属性的封装

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class Animal {     private _name: string;     private _age: number;          constructor(name: string,age: number){         this._name = name;         this._age = age;     }       sayHello(){         console.log("hello");     }       get name(){         return this._name;     }     set name(name){         this._name = name;     }       get age(){         return this._age;     }     set age(age){         this._age = age;     } }   const an = new Animal("小黑",3); an.name = "小红" console.log(an);