core_js_3.js

var People = function(name, age) {
     var name = name;
     var age = age;

     var isAdult = function() {
          if(age > 19) return true;
          else return false;
     }

     this.viewMyInfo = function() {
          if(isAdult()) {
               return name + "님은 성인이 맞습니다.";
          } else {
               return name + "님은 성인이 아닙니다.";
          }
     }
}

var people = new People("Moon-Hak-I", 26);
alert(people.isAdult());          // Uncaught TypeError: Object [object Object] has no method 'isAdult'
alert(people.viewMyInfo());