//ES5 继承
function People(name, age){
console.log(this) //这里面的this就是这个对应实例化对象
//实例属性是定义在构造函数里面的
this.name = name
this.age = age
People.count ++
}
// 实例方法
People.prototype.showName = function (){
console.log(`我的名字叫做${this.name}`)
}
//静态属性 是直接定义在类里面的
People.count = 0
// 静态方法
People.getCount = function () {
console.log(this) //这里指的是构造函数不是实例化对象
console.log(this.age) // undefined
console.log(`实例化的次数${People.count}`)
}
let p1 = new People("Yangang", 16)
let p2 = new People("Yang", 20)
p1.showName()
//console.log(p2)
let str = new String('Yang') //实例化字符串
let arr = new Array(1, 2, 3)
console.log(arr)
let obj = new Object()
obj.name = "Yangang"
console.log(People.count) //直接类.属性值就可以得到对应的值
People.getCount()
//父类
function Animal(name) {
this.name = name
}
Animal.prototype.showName = function () {
console.log(`动物的名字${this.name}`)
}
//子类
function Dog(name, color) {
Animal.call(this, name)
this.color = color
}
Dog.prototype = new Animal() //原型继承
Dog.prototype.constructor = Dog //原型继承 但是需要把构造函数只会子类
let dog = new Dog("旺财", "黑色")
console.log(dog)
dog.showName()
一起设计吧
