外观模式

外观模式
对一系列接口进行二次封装，供上层使用。上层使用时只需按照规则进行即可。
通过中间者让客户端和子系统解耦，也让子系统更易于扩展

image.png

Client.js

const Computer = require('./Computer');

computer = new Computer();
computer.start();
computer.shutDown();

Computer.js

const CPU = require('./CPU');
const Memory = require('./Memory');
const Disk = require('./Disk');
function Computer() {
  let _cpu, _memory, _disk;
  _cpu = new CPU();
  _memory = new Memory();
  _disk = new Disk();

  this.start = function () {
    _cpu.startUp();
    _memory.startUp();
    _disk.startUp();
  };

  this.shutDown = function() {
    _cpu.shutDown();
    _memory.shutDown();
    _disk.shutDown();
  };
}

module.exports = Computer;

CPU.js

function CPU() {
  this.startUp = function() {
    console.log("CPU运行");
  };

  this.shutDown = function() {
    console.log("CPU停止");
  };
}

module.exports = CPU;

Disk.js

function Disk() {
  this.startUp = function() {
    console.log("Disk运行");
  };

  this.shutDown = function() {
    console.log("Disk停止");
  };
}

module.exports = Disk;

Memory.js

function Memory() {
  this.startUp = function() {
    console.log("Memory运行");
  };

  this.shutDown = function() {
    console.log("Memory停止");
  };
}

module.exports = Memory;

运行结果

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