C++ back-end - Javascript front-end

I want to create a simple website using C++ as my back-end and Javascript as my front-end, but I'm a completely newbie when it comes to web development. What do I need to know/use in order to accomplish this that I want to do?

Let's say I want to create a simple dumb game in C++ but I want to run it on my browser through Javascript.

Thanks in advance! :D