SOURCE

(function() {
  var name = ""
  Person = function(v) {
    name = v
  }
  
  Person.prototype.getName = function () {
    return name
  }
  
  Person.prototype.setName = function (v) {
    name = v
  }
})()

var p1 = new Person("aaa");
var p2 = new Person("bbb")
p1.setName("cccc")
console.log(p1.getName())
console.log(p2.getName())