升級 nodejs

為了使用 nodejs 6.10.1 升級指令:

1. curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash -

2. sudo apt-get install -y nodejs

// javascript 程式使用 class

class ClassA {

    constructor(name) {

        this.aliasName = name;      

    }

    get name() {

        return this.aliasName.toUpperCase();

    }

    set name(name){

        if(name){ 

            this.aliasName = name;

        }

    }   

}

class ClassB extends ClassA {

constructor(name) {

super(name);// super needs to be called first

this.newp = function(){console.log("Hi"); }

}

}

let a = new ClassB("first"); // invoke constructor

console.log(a.aliasName+' : '+a.name); // invoke getter

a.name = "second"; // invoke setter

console.log(a.aliasName+' : '+a.name);// invoke getter

a.newp();