I just try your Bootstrap 3 demo
https://tagawa.github.io/bootstrap-without-jquery/bootstrap3/demo/
when I change the window size to small, I will the see the Toggle navigation Button. that's normal.
now, I hit the button many times quickly. the button will be frozen.
so if I refresh the page, and click the button slowly, one by one. the button is working fine.
I use your Js in my project. my daughter find the problem. you know, the kids always like click sound.
my system is windows 7 with chrome

I just try your Bootstrap 3 demo
https://tagawa.github.io/bootstrap-without-jquery/bootstrap3/demo/
when I change the window size to small, I will the see the Toggle navigation Button. that's normal.
now, I hit the button many times quickly. the button will be frozen.
so if I refresh the page, and click the button slowly, one by one. the button is working fine.
I use your Js in my project. my daughter find the problem. you know, the kids always like click sound.
my system is windows 7 with chrome
