Update index.html

[chiangtor]

The javascripts within the script tags requires dom loaded. So warpped with :

$(function(){
  // existing javascripts.
});

[LOZORD]

Yup, this really needs to pulled in! Was tearing my hair out until I realized this was the fix.

[eduardomazolini]

In http://socket.io/get-started/chat/ :

Now in index.html I add the following snippet before the </body>

Please upgrade to "after" or accept the use of "ready" I lost a few hours to find my mistake. Personally I used "ready" as solution.