javascript - javascript中的继承和覆盖

Question

下面是我的JS代码:

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

Person.prototype.calculateAge=function()
{
    console.log(2016-this.age);
}

var Teacher=function(salary)
{
    this.salary=salary;
}

Teacher.prototype.calculateAge=function() // Ovverriding the fucntion calculateAge
{
    console.log("welcome to my world");
}


var pp=new Person('john',31);  // creating object pp, pp.name // john

Teacher.prototype=pp;

var t= new Teacher(20);   // inherit name and age , t.name // john

// now here am confused 
  t.calculateAge() // 1990  but am ovverride it will print my console right 
  //

谁能解释一下我该如何覆盖？在这里，当我重写计算年龄函数时，通过调用 t.calculateAge() 其打印继承了一个

Answer 1

这段代码可能有效:

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

Person.prototype.calculateAge=function()
{
    console.log(2016-this.age);
}

function Teacher(salary)
{
    this.salary=salary;
}
Teacher.prototype = new Person();

Teacher.prototype.calculateAge=function() // Ovverriding the fucntion calculateAge
{
    console.log("welcome to my world");
}



var t= new Teacher(20);   // inherit name and age , t.name // john

// now here am confused 
  t.calculateAge() // 1990  but am ovverride it will print my console right 
  //