构造器是用来实例化对象的。

var person = {
    first: "greg",
    last: "gum",
    fullName: function()
    {
        return this.first + " " + this.last;
    }
}

console.log(person.fullName());


var PersonFactory = function () {
    this.first = "greg";
    this.last = "gum";
    this.fullName = function()
    {
        return this.first + " " + this.last;
    }
};

var person2 = new PersonFactory();
console.log(person2.fullName());

https://developer.mozilla.org...