this.name = name
this.sayHello = function(){alert(this.name+” say Hello!”)}
}
function B(name,id){
this.temp = A
this.temp(name) //相当于new A()
delete this.temp
this.id = id
this.checkId = function(ID){alert(this.id==ID)}
}
继承方法一、利用call或者apply方法改变this的指针，function A(name,age){
this.age = age ? age : 25
this.name = name ? name : '小明'
this.say = function(){
alert(this.name + '今年' + this.age + '岁了！')
}
}
function B(name,age){
A.apply(this,arguments)
}
C = new B('小刚',18)
C.say()
继承方法二、
function A(name,age){
this.age = age ? age : 30
this.name = name ? name : '小明'
this.say = function(){
alert(this.name + '今年' + this.age + '岁了！')
}
}
function B(){}
B.prototype = new A()
var C = new B()C.say()
<script type = "text/javascript">//父类
function Person(name, age) {
//属性
this.name = name
this.age = age
}
//方法
Person.prototype.showName = function() {
alert(this.name)
}
Person.prototype.showAge = function() {
alert(this.age)
}
//子类
function Coder(name, age, job) {
//继承父类的属性
//调用父类的构造方法
Person.call(this, name, age)
//增加自己的属性
this.job = job
}
//通过原型链继承父类的方法
Coder.prototype = Person.prototype
//增加自己的方法
Coder.prototype.showJob = function() {
alert(this.job)
}
//创建一个对象测试
var programer = new Coder('pro', '25', 'programer')
programer.showName()
programer.showAge()
programer.showJob()
</script>
