浅谈JavaScript 代码简洁之道(8)

// 动物
class Animal {
 constructor(age) {
 this.age = age
 };
 move() {};
}

// 哺乳动物
class Mammal extends Animal{
 constructor(age, furColor) {
 super(age);
 this.furColor = furColor;
 };
 liveBirth() {};
}

// 人类
class Human extends Mammal{
 constructor(age, furColor, languageSpoken) {
 super(age, furColor);
 this.languageSpoken = languageSpoken;
 };
 speak() {};
}

class Car {
 constructor(make, model, color) {
 this.make = make;
 this.model = model;
 this.color = color;
 }

 setMake(make) {
 this.make = make;
 }

 setModel(model) {
 this.model = model;
 }

 setColor(color) {
 this.color = color;
 }

 save() {
 console.log(this.make, this.model, this.color);
 }
}

const car = new Car('Ford','F-150','red');
car.setColor('pink');
car.save();

class Car {
 constructor(make, model, color) {
 this.make = make;
 this.model = model;
 this.color = color;
 }

 setMake(make) {
 this.make = make;
 return this;
 }

 setModel(model) {
 this.model = model;
 return this;
 }

 setColor(color) {
 this.color = color;
 return this;
 }

 save() {
 console.log(this.make, this.model, this.color);
 return this;
 }
}

const car = new Car('Ford','F-150','red')
 .setColor('pink');
 .save();

class Employee {
 constructor(name, email) {
 this.name = name;
 this.email = email;
 }

 // ...
}

// TaxData（税收信息）并不是属于 Employee（雇员），而是包含关系。
class EmployeeTaxData extends Employee {
 constructor(ssn, salary) {
 super();
 this.ssn = ssn;
 this.salary = salary;
 }

 // ...
}

class EmployeeTaxData {
 constructor(ssn, salary) {
 this.ssn = ssn;
 this.salary = salary;
 }

 // ...
}

class Employee {
 constructor(name, email) {
 this.name = name;
 this.email = email;
 }

 setTaxData(ssn, salary) {
 this.taxData = new EmployeeTaxData(ssn, salary);
 }
 // ...
}