如何在JS(Javascript)中重载Object的构造函数？

function createObject(name, age) {
  var obj = {};
  obj.name = name;
  obj.age = age;
  obj.sayHello = function() {
    console.log("Hello, my name is " + this.name + " and I am " + this.age + " years old.");
  };
  return obj;
}

var obj1 = createObject("John", 25);
obj1.sayHello(); // 输出：Hello, my name is John and I am 25 years old.

var obj2 = createObject("Jane", 30);
obj2.sayHello(); // 输出：Hello, my name is Jane and I am 30 years old.