方法一:原型链继承
// 父类型
function Supper() {
this.supProp = ' Supper Prop'
}
Supper.prototype.ShowSupperProp = function() {
console.log(this)
console.log(this.supProp)
}
// 子类型
function Sub() {
this.subProp = 'Sub Prop'
}
// 子类型的原型为父类型的一个实例对象
Sub.prototype = new Supper()
Sub.prototype.constructor = Sub // 修正constructor
Sub.prototype.showSubProp = function() {
console.log(this.subProp)
}
var sub = new Sub()
sub.ShowSupperProp()
sub.showSubProp()
方式二:借用构造函数继承
function Person(name, age) {
this.name = name
this.age = age
}
function Student(name, age, price) {
Person.call(this, name, age) // 相当于this.Person(name,age)
this.price = price
}
var s = new Student('Tom', 12, 12000)
console.log(s.name, s.age, s.price)
方式三:组合继承
function Person(name, age) {
this.name = name
this.age = age
}
Person.prototype.setName = function(name) {
this.name = name
}
function Student(name, age, price) {
Person.call(this, name, age) // 相当于this.Person(name,age)
this.price = price
}
Student.prototype = new Person()
Student.prototype.constructor = Student
Person.prototype.setPrice = function(price) {
this.price = price
}
var s = new Student('Tom', 12, 12000)
console.log(s.name, s.age, s.price)