syscall/js.FuncOf support

[aykevl]

No description provided.

[aykevl]

Of course, this doesn't work well with Go 1.11 because js.FuncOf was only added in Go 1.12...

[aykevl]

I was thinking that it may be better to add a new example that uses js.FuncOf instead of modifying the export example. That would also make it easier to fix the compilation error here.

[johanbrandhorst]

I was thinking that it may be better to add a new example that uses js.FuncOf instead of modifying the export example. That would also make it easier to fix the compilation error here.

I think we could add it to the non-export example without making it too busy.

[aykevl]

New attempt, now more carefully written.

[aykevl]

I've now split the examples, it seems cleaner to me (although there is a bit of duplication). It clearly shows both ways of doing the same thing which may be useful.

@johanbrandhorst @justinclift any thoughts?

[aykevl]

I have updated the callback example to be more in a functional style. Not sure whether this example is much better but would like to hear some thoughts on it.

[johanbrandhorst]

LGTM

[justinclift]

It's a trivial thing, but maybe have the result input all be on one line?

[aykevl]

Fixed. Yes that's a bit unclean. (Probably some unintended auto-wrapping by my editor?)

[justinclift]

LGTM too.

.Set("oninput", updater(&a)) is interesting too. Didn't know that was a thing, having only mucked around with .addEventListener("mousedown", someFunction) before. 😄

[aykevl]

Yes, you can also set events by setting the on-prefixed property. However, this is generally discouraged for many things because it overwrites the old event handler. addEventListener was added specifically to avoid that.