function Otaku (name, age) {
Otaku.prototype.strength = 60;
Otaku.prototype.sayYourName = function () {
console.log('I am ' + this.name);
var person = new Otaku('Kevin', '18');
console.log(person.name) // Kevin
console.log(person.habit) // Games
console.log(person.strength) // 60
person.sayYourName(); // I am Kevin