fix ribbon cause scroll not working

[dolphinlin]

the code cause an exception.

  document.addEventListener("touchmove", function(e) {
    e.preventDefault()
  });

see that > JS MDN

[ivan-nginx]

This is fix? All worked fine?

[dolphinlin]

yeap!
remove the code from there, it works

[ivan-nginx]

Ok, well done! And thanks!

[dolphinlin]

i improved the performance.
i think the code that avoid redrawing background when touch screen to click or move.
click -> do to.
move -> don't to do.

so i add some judgment for improving performance

i need to PR?