在javascript中使用原型的主要优点是什么？

function Candy(name) {
 this.name = name;
}
Candy.prototype.printName = function () {
 console.log(this.name);
}
var chocolate = new Candy("chocolate");
chocolate.printName();
var gummyBears = new Candy("gummy bears");
gummyBears.printName();

这与不使用原型完全相同：

function Candy(name) {
  this.name = name;
  this.printName = function () {
    console.log(this.name);
  }
}
var chocolate = new Candy("chocolate");
chocolate.printName();
var gummyBears = new Candy("gummy bears");
gummyBears.printName();

所以我不确定使用原型的优势是什么！