學習設計模式——橋接模式

橋接模式，將抽象部分與它的實現部分分離，使他們都可以獨立地變化
使用組合關係代替繼承關係，降低抽象和實現兩個可變緯度的耦合度

// 用橋接模式 實現工廠生產洗衣機的不同型號

// 組裝洗衣機
function Washer(motorType, rollerType, transducerType) {
  this.motor = new Motor(motorType);
  this.roller = new Roller(rollerType);
  this.transducer = new Transducer(transducerType);
}

// 洗衣機工作
Washer.prototype.work = function() {
  this.motor.run();
  this.roller.run();
  this.transducer.run();
};

// 電機
function Motor(type) {
  this.motorType = type + "電機";
}
Motor.prototype.run = function() {
  console.log(this.motorType + "開始工作");
};

// 滾筒
function Roller(type) {
  this.rollerType = type + "滾筒";
}
Roller.prototype.run = function() {
  console.log(this.rollerType + "開始工作");
};

// 變頻器
function Transducer(type) {
  this.transducerType = type + "變頻器";
}
Transducer.prototype.run = function() {
  console.log(this.transducerType + "開始工作");
};

// 新建洗衣機
var washerA = new Washer("小功率", "直立", "小功率");
washerA.work();

var washerB = new Washer("中功率", "滾筒", "中功率");
washerB.work();

// es6實現
class Washer2 {
  constructor(motorType, rollerType, transducerType) {
    this.motor = new Motor2(motorType);
    this.roller = new Roller2(rollerType);
    this.transducer = new Transducer2(transducerType);
  }
  work() {
    this.motor.run();
    this.roller.run();
    this.transducer.run();
  }
}

class Motor2 {
  constructor(motorType) {
    this.motorType = motorType + "電機";
  }
  run() {
    console.log(this.motorType + "開始工作");
  }
}

class Roller2 {
  constructor(rollerType) {
    this.rollerType = rollerType + "滾筒";
  }
  run() {
    console.log(this.rollerType + "開始工作");
  }
}

class Transducer2 {
  constructor(transducerType) {
    this.transducerType = transducerType + "變頻器";
  }
  run() {
    console.log(this.transducerType + "開始工作");
  }
}

let washerA1 = new Washer2("大功率", "橫滾", "中等變頻");
washerA1.work();