SOURCE

// 父类
function Father(name) {
  this.name = name;
}

Father.prototype.sayName = function() {
  console.log(this.name); 
}

// 另一个父类 
function Mother(name) {
  this.name = name;
}

Mother.prototype.sayHello = function() {
  console.log('Hello ' + this.name); 
}

// 子类
function Son(name) {
  Father.call(this, name);
  Mother.call(this, name);
}

// 继承方法  
Son.prototype = Object.create(Father.prototype);
Object.assign(Son.prototype, Mother.prototype);
Son.prototype.constructor = Son;
let son = new Son('Kevin');

son.sayName();     // Kevin
son.sayHello();    // Hello Kevin
console.log(Son.prototype.constructor) //指向了Son本身
console.log(son instanceof Son) //true
console.log(son instanceof Father)//true
console.log(son instanceof Mother)//false