How do I create a class in Javascript?

Question

This is what I got so far, and it\'s not working at all :( all the variables are null in my player class and update never gets called.

I mean a programming class, not a

Answer 1

The var makes a private variable, do prefix with this instead in your constructor:

        function Player () {
            this.speed = 5;
            this.x = 50;
            this.y = 50;
            var pri = 'private';
            this.update = function() {
                  if(keys[37]) this.x -= this.speed;
                  if(keys[39]) this.x += this.speed;
            }
        }

        var player = new Player;
        alert( player.speed ) // should alert 5
        alert( player.pri ) // should fail or say undefined

You can also do...

      var player = {
           speed: 5,
           x:50,
           y:50,
           update: function() {
               // code
           }
      }

And then get rid of new Player and the Player constructor.