Please explain this usage of a colon in javascript

Question

I\'m making a library, and I often inspect the result of Closure Compiler\'s output to see how it\'s doing things (I do have unit tests, but I still like to see the compiled

Answer 1

That is just a label.

you can use continue [label name] (or break) in a loop to go to a label.

More explanations of what they are can be seen throughout the interwebs.