Unable to access the microphone

[YeDaxia]

Hi, thanks for your job~ I try this on wechat and my phone native browser,
It cannot work and a toast: Unable to access the microphone~

but it does work in https://jbergknoff.github.io/guitar-tuner/ .

I think maybe you should add this code ：

navigator.getUserMedia({ "audio": true }, use_stream, function() {});

http://jonathan.bergknoff.com/journal/making-a-guitar-tuner-html5