Can these be used for scripting for games?

Answer 1

Yes, if you look at Unity (a popular game developing software), they take C# and/or Javascript.

Answer 2

You can create html5 games with some game libraries, such as createjs, impactjs, pixijs or phaser etc.
createjs
http://www.createjs.com
impactjs
http://impactjs.com
pixijs
http://www.pixijs.com
three.js
http://threejs.org
phaser
http://phaser.io

Answer 3

yes I can use it with web games or application games using node.js

Answer 4

Yes