示例参考

// 动物 》哺乳动物 》人类 》lsd

function Animal(color, weight) {
  this.color = color;
  this.weight = weight;
}

Animal.prototype.eat = function () {
  console.log('mia mia mia...');
}

Animal.prototype.sleep = function () {
  console.log('zzz...');
}

// var a = new Animal('black', 120);
// console.log('a:', a);

function Mammal(color, weight) {
  Animal.call(this, color, weight);
}

Mammal.prototype = Object.create(Animal.prototype);
Mammal.prototype.constructor = Mammal;
Mammal.prototype.suckle = function () {
  console.log('mia！好奶！');
}

// var m = new Mammal('black', 100);
// console.log('m:', m);

function Person(color, weight) {
  Mammal.call(this, color, weight);
}

Person.prototype = Object.create(Mammal.prototype);
Person.prototype.constructor = Person;
Person.prototype.lie = function () {
  console.log('你不帅');
}

var lsd = new Person('brown', 100);
var whh = new Person('brown', 80);
console.log('lsd:', lsd);
console.log('whh:', whh);