如何在js函数的同一页面创建多个实例

function MyClass(name) {
  this.name = name;
}

var instance1 = new MyClass("Instance 1");
var instance2 = new MyClass("Instance 2");

function createInstance(name) {
  return {
    name: name
  };
}

var instance1 = createInstance("Instance 1");
var instance2 = createInstance("Instance 2");

class MyClass {
  constructor(name) {
    this.name = name;
  }
}

var instance1 = new MyClass("Instance 1");
var instance2 = new MyClass("Instance 2");