function Test(){
    this.name='123'
}
var test=new Test()
console.log(test.name)

function Person(name,age){
    this.name="geyao"
    this.age=18
}
function Programmer(name,age){
    Person.apply(this,[name,age])
    this.work="Programmer"
}
var p=new Programmer("geyao",18)
console.log(p)

运行结果