function Person(name){
    this.name = name
}

function Employee(name,dept){
    //將 this 指定給 Person 設定
    Person.call(this,name)
    this.dept = dept
}

const mary = new Employee('Mary','IT')
const kitty = new Employee('Kitty','HR')

//擁有 name Property
console.log(mary.name)
//Mary

//也有 dept
console.log(kitty.dept)
//HR