Changing variable by html button

Question

I\'m learning javascript and I decided to create simple Rock, Paper, Scissors game. I want to make it controllable by buttons. So I made this in html:

Answer 1

One problem:

var user = "none";
function user(choice){
    var user = choice;
}

One variable of user is hiding the other variable of user.

And having a function and variable with the same name is a BAD idea.