cati.setName("Tom"); cat2.setName("Angela"); cat2=cat1; cat2.setName("Doraemon"); System.out.println(cat1.getName()); System.out.println(cat2.getName());

function Cat(name) {
  this.name = name;
}

Cat.prototype.setName = function(newName) {
  this.name = newName;
};

Cat.prototype.getName = function() {
  return this.name;
};

var cat1 = new Cat('Tom');
var cat2 = cat1;
cat2.setName('Doraemon');

console.log(cat1.getName());
console.log(cat2.getName());