推荐的原型继承方式

prototype.js

/**
 * Person类（父类）
 */
function Person(name, age) {
    this.name = name;
    this.age = age;
}

Person.prototype.getName = function() {
    return this.name;
}

Person.prototype.setName = function(name) {
    this.name = name;
}

Person.prototype.getAge = function() {
    return this.age;
}

Person.prototype.setAge = function(age) {
    this.age = age;
}

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

Student.prototype = new Person();

Student.prototype.getMajor = function() {
    return this.major;
}

Student.prototype.setMajor = function(major) {
    this.major = major;
}

var s = new Student("zhangsan", 24, "计算机技术");
s instanceof Person && s instanceof Student; // => true