(function() {
    type happy = {
        name: string,
        age: number,
    }
    // 类型别名 定义数据
    const obj:happy = {
        name: "孙悟空",
        age: 20,
    }
    /**
     * 接口 换而言之 也是一种定义数据的规范
     * 
     */
    interface sad {
        name: string,
        age: number,
    }

    interface sad {
        sex: string
    }

    // 继承 extends
    // 接口 interface implements
    class Person implements sad {
        // num: number;
        // constructor(num: number) {
        //     this.num = num;
        // }
        name: string;
        age: number;
        num: number;
        sex: string;
        constructor(name: string, age: number, sex: string,num:number) {
            this.name = name;
            this.age = age;
            this.num = num;
            this.sex = sex;
        }
        say() {
            console.log(this.name, this.age, this.num, this.sex,'我是个好人');
        }

    }
    let a = new Person("猪八戒", 20, "男",1);
    a.say()
})()