QRcode for Hexo helper plugins.
$ npm i -S hexo-helper-qrcode
<img src="<%- qrcode(url) %>">
<!-- white margin, default 0 -->
<img src="<%- qrcode(url, {
margin: 2
}) %>">
<!-- size of one module in pixels, default 6 -->
<img src="<%- qrcode(url, {
size: 4
}) %>">MIT