I was surprised with his answer, as they currently rely on the unity3d market for sales. I don't need to go into the details of why it's a great idea to make a photon-construct2 plugin. They'll come around eventually.
CJR Gaming has been a real life saver with Photon. But it required me to learn a spot of C#.
cjrgaming.com/photon_mmo_development
It's the closest thing I've found to SocketIO.
Javascript Multiplayer Map Demo
I've never seen this before, didn't even know they had a Javascript demo. Was it in the Java SDK? If so, it's probably targeting the Photon Server(Hosted) and not their cloud (Which is still ok).
I have quite a bit of experience with the Photon Server version so if you need some quick answers, that's definitely something I can help with.