temp.js

(function () {
  'use strict';

  function Person(name, age, gender) {
    this.name = name;
    this.age = age;
    this.gender = gender;
  }

  Person.prototype.getName = function () {
    return 'Name: ' + this.name.toString();
  };

  Person.prototype.getAge = function () {
    return 'Age: ' + this.age.toString();
  };

  Person.prototype.getGender = function () {
    return 'Gender: ' + this.gender.toString();
  };

  Person.prototype.getSummary = function () {
    return [this.getName(),
      this.getGender(),
      this.getAge()].join(',\n');
  };

  function Student(name, age, sex, grade, school) {
    Person.call(this, name, age, sex);
    this.grade = grade;
    this.school = school;
  }

  Student.prototype = Object.create(Person.prototype, {
    getGrade: {
      value: function () {
        return 'Grade: ' + this.grade.toString();
      }
    },
    getSchool: {
      value: function () {
        return 'School: ' + this.school.toString();
      }
    },
    getSummary: {
      value: function () {// override
        var tempSummary = Person.prototype.getSummary.apply(this);
        return [tempSummary, this.getGrade(), this.getSchool()].join(',\n');
      }
    }
  });


  var person = new Person('Sachin Tendulkar',
    42,
    'Male'),
    student = new Student('Arjun Tendular',
      16,
      'Male',
      12,
      'Shardahram School');

  person.getSummary();
  //Name: Sachin Tendulkar,
  //Gender: Male,
  //Age: 42


  console.log(student.getSummary());
  // Name: Arjun Tendular,
  // Gender: Male,
  // Age: 16, Grade: 12, School: Shardahram School


}());