Javascript design pattern prototype mode details

function Person(name) {
  this.name = name;

  this.config = {
    a: "1",
    b: "2",
  };

  this.hello = function () {
    console.info("hello");
  };
}

const config = {
  a: "1",
  b: "2",
};
const hello = function () {
  console.info("hello");
};
function Person(name) {
  this.name = name;

  this.config = config;

  this.hello = hello
}

function Person() {}
var p = new Person();

function Person(name) {
  this.name = name;

  this.config = {
    a: "1",
    b: "2",
  };

  this.hello = function () {
    console.info("hello");
  };
}

//This method will rewrite the prototype, causing the constructor to be lost and become Object().
//You can use Person.prototype.xx=yy to write, or re-specify Person.prototype.constructor=Person
Person.prototype = {
  version: 1.0,
  say: function (arg) {
    console.info(`${this.name} say ${arg}`);
  },
  constructor: Person,
};
var p1 = new Person("p1");
var p2 = new Person("p2");

console.info(p1.config == p2.config); //false
console.info(p1.hello == p2.hello); //false
console.info(p1.say === p2.say); //true
p1.say("qq");
p2.say("qq");
console.info(p1.version === p2.version); //true
console.info(p1.version);

function Person(name) {
  this.name = name;

  this.config = {
    a: "1",
    b: "2",
  };

  this.hello = function () {
    console.info("hello");
  };
}

//This method will rewrite the prototype, causing the constructor to be lost and become Object()
Person.prototype = {
  version: 1.0,
  say: function (arg) {
    console.info(`${this.name} say ${arg}`);
  },
};

function PersonA(name) {
  Person.call(this, name);
}
PersonA.prototype = Person.prototype;

function PersonB(name) {
  Person.call(this, name);
}
PersonB.prototype = Person.prototype;
var pA = new PersonA("pa");
var pB = new PersonB("pb");

console.info(pA.config == pB.config); //false internal property comparison console.info(pA.hello == pB.hello); //false internal property comparison console.info(pA.say === pB.say); //true prototype method sharing pA.say("qq");
pB.say("qq");
console.info(pA.version === pB.version); //true prototype property sharing console.info(pA.version); //1.0
Person.prototype.version = 2.0; //Modify prototype shared properties console.info(pB.version); //2.0
console.info(new Person().version); //2.0

//Modify the prototype sharing method PersonB.prototype.say = function (arg) {
  console.info(`v2--- ${this.name} say ${arg}`);
};
pB.say("qq");
new Person("Person").say("ww");

const moduleA = {
  say: function (msg) {
    console.info("A say " + msg);
  },

  letBrun: function () {
    //Directly reference moduleB
    moduleB.run();
  },
};

const moduleB = {
  run: function () {
    console.info("B run ");
  },

  letAsay: function () {
    //Directly reference moduleA
    moduleA.say("hello");
  },
};

moduleA.letBrun(); //B Run
moduleB.letAsay(); //A say hello

const moduleA = {
  say: function (msg) {
    console.info("A say " + msg);
  },
};

const moduleB = {
  run: function () {
    console.info("B run ");
  },
};

const parentModule = {
  moduleA,
  moduleB,

  letBrun: function () {
    this.moduleB.run();
  },

  letAsay: function () {
    this.moduleA.say("hello");
  },
};

parentModule.letBrun(); //B Run
parentModule.letAsay(); //A say hello

function Emitter() {
  this.events = {};
  this.res_oldAction = {}
  this.res_action_events = {}
}

//Subscribe to resourcesEmitter.prototype.subscribe = function (res, action, fn) {
  if(!this.res_oldAction[res.name]){
 this.res_oldAction[res.name] = res[action]
 res[action] = (data) => {
      this.res_oldAction[res.name](data)
   const fns = this.res_action_events[res.name].action;
      for (let i = 0; i < fns.length; i++) {
        fns[i](data);
      }
    }
  }
  
  if(!this.res_action_events[res.name]){
 this.res_action_events[res.name] = {}
  }
  
  if(!this.res_action_events[res.name][action]){
 this.res_action_events[res.name][action] = []
  }
  
  this.res_action_events[res.name].action.push(fn)
}

//Unsubscribe resourcesEmitter.prototype.unsubscribe = function (res, action, fn) {
  const fns = this.res_action_events[res.name].action;
  for (let i = 0; i < fns.length; i++) {
 if (fns[i] === fn) {
   fns.splice(i, 1);
   i--;
 }
  }
}

Emitter.prototype.on = function (name, fn) {
  if (!this.events[name]) {
    this.events[name] = [];
  }

  this.events[name].push(fn);
};

Emitter.prototype.remove = function (name, fn) {
  if (!this.events[name]) {
    return;
  }

  const fns = this.events[name];

  for (let i = 0; i < fns.length; i++) {
    if (fns[i] === fn) {
      fns.splice(i, 1);
      i--;
    }
  }
};

Emitter.prototype.fire = function (name, data) {
  if (!this.events[name]) {
    return;
  }

  const fns = this.events[name];

  for (let i = 0; i < fns.length; i++) {
    fns[i](data);
  }
};

const emitter = new Emitter();

//Register events in module A const methodA = (data) => {
  console.info("Module A received food message:");
  console.info(data);
};

emitter.on("food", methodA);

//Register events in module B const methodB = (data) => {
  console.info("Module B receives food message:");
  console.info(data);
};
emitter.on("food", methodB);

//Trigger event in module C emitter.fire("food", "Rice is coming");

//Remove event from module B emitter.remove("food", methodB);

//Trigger the event again in module C emitter.fire("food", "Rice is here again");