typescript interface 隐式抽象

interface IPerson {
    name: string;
    age: number;
    greet(): string;
}
 
class Person implements IPerson {
    name: string;
    age: number;
 
    constructor(name: string, age: number) {
        this.name = name;
        this.age = age;
    }
 
    greet(): string {
        return `Hello, my name is ${this.name} and I am ${this.age} years old.`;
    }
}
 
const person: IPerson = new Person("Alice", 30);
console.log(person.greet()); // 输出: Hello, my name is Alice and I am 30 years old.