function People(name, age) {
    this.name = name;
    this.age = age;
    this.eat = function () {
        console.log(`${this.name}: people eat!`);
    };
}
People.prototype.protoEat = function () {
    console.log(`${this.name}: proto eat!!`);
};
 function Student(name, age) {
People.call(this, name, age);
Student.prototype.constructor = Student;
} 
 Student.prototype = new People();

function People(name, age) {
this.name = name;
this.age = age;
this.eat = function () {
console.log(${this.name}: eat!);
};
}
People.prototype.protoEat = function () {
console.log(${this.name}: proto eat!!);
}; 
 function Student(name, age) {
People.call(this, name, age);
} 
 for (const key in People.prototype) {
Student.prototype[key] = People.prototype[key];
}

var obj = {
name: "People",
eat: function () {
console.log("eat fn!");
}
}; 
 function clone(obj) {
const Fn = new Function();
Fn.prototype = obj;
return new Fn();
} 
 const tt = clone(obj);
tt.eat();