Javascript - 对象初始化程序？

const obj = {
  property1: "value1",
  property2: "value2",
  method1: function() {
    // do something
  },
  method2: function() {
    // do something else
  }
};

function Obj(property1, property2) {
  this.property1 = property1;
  this.property2 = property2;
  this.method1 = function() {
    // do something
  };
  this.method2 = function() {
    // do something else
  };
}

const obj = new Obj("value1", "value2");

function createObj(property1, property2) {
  return {
    property1: property1,
    property2: property2,
    method1: function() {
      // do something
    },
    method2: function() {
      // do something else
    }
  };
}

const obj = createObj("value1", "value2");

class Obj {
  constructor(property1, property2) {
    this.property1 = property1;
    this.property2 = property2;
  }

  method1() {
    // do something
  }

  method2() {
    // do something else
  }
}

const obj = new Obj("value1", "value2");