1. function Gromy(name,age){
    2.     this.name = name;
    3.   this.age = age;
    4.   this.message = []
    6.   function sayName(){
    7.           console.log('hi im '+this.name )
    8.   }
    9.   this.sayAge=function(){
    10.       console.log('im '+this.age)
    11.   }
    12. }
    13. Gromy.prototype.setMessage = function(message){
    14.   this.message.push(message)
    15. }
    16. Gromy.prototype.getMessage = function(){
    17.   console.log(JSON.stringify(this.message))
    18. }
    1. let gromy = new Gromy('gromy',18)
    3. gromy.name // 'gromy'
    4. gromy.sayAge() // im 18
    5. gromy.sayName()
    6.   //Uncaught TypeError: gromy.sayName is not a function
    8. gromy.setMessage('qq')
    9. gromy.getMessage()  // ["qq"]