36.寄生式组合继承的实现
36. 寄生式组合继承的实现？
function Person(name) {
this.name = name;
}
Person.prototype.sayName = function () {
console.log("My name is " + this.name + ".");
};
function Student(name, grade) {
Person.call(this, name);
this.grade = grade;
}
Student.prototype = Object.create(Person.prototype);
Student.prototype.constructor = Student;
Student.prototype.sayMyGrade = function () {
console.log("My grade is " + this.grade + ".");
};