function Person(name,age){
      this.name=name
      this.age=age
    }
    Person.prototype.getName=function(){
      return this.name
    }
    var p1=new Person('aa',12)
    var p2=new Person('bb',14)
    console.log(p1.name)
    console.log(p2.name)
    console.log(p1.getName===p2.getName)//true