JS中的原型属性

Question

1

function Fruit (type) {
    this.type = type;
    this.color = 'unknown';
}

Fruit.prototype.getInformation = function() {
    return 'This ' + this.type + ' is ' + this.color + '.';
}

let lime = new Fruit('Mexican lime');
console.log(lime.getInformation());

lime.color = 'green';
console.log(lime.getInformation());

2

function Fruit (type) {
    this.type = type;
    this.color = 'unknown';
    this.getInformation = function() {
        return 'This ' + this.type + ' is ' + this.color + '.';
    }
}

let lime = new Fruit('Mexican lime');
console.log(lime.getInformation());

lime.color = 'green';
console.log(lime.getInformation());

我无法区分这两个代码;就像原型的功能到底有什么用呢？