hexo-theme-butterfly/layout/includes/third-party/math/mathjax.pug

//- Mathjax 3
//- http://docs.mathjax.org/en/latest/upgrading/v2.html#changes-in-the-mathjax-api
//- https://github.com/mathjax/MathJax/issues/2209
//- http://docs.mathjax.org/en/latest/options/input/tex.html#the-configuration-block
//- http://docs.mathjax.org/en/latest/web/typeset.html#resetting-automatic-equation-numbering

script.
  if (!window.MathJax) {
    window.MathJax = {
      loader: {
        source: {
          '[tex]/amsCd': '[tex]/amscd'
        }
      },
      tex: {
        inlineMath: [ ['$','$'], ["\\(","\\)"]],
        tags: 'ams'
      },
      options: {
        renderActions: {
          findScript: [10, doc => {
            for (const node of document.querySelectorAll('script[type^="math/tex"]')) {
              const display = !!node.type.match(/; *mode=display/)
              const math = new doc.options.MathItem(node.textContent, doc.inputJax[0], display)
              const text = document.createTextNode('')
              node.parentNode.replaceChild(text, node)
              math.start = {node: text, delim: '', n: 0}
              math.end = {node: text, delim: '', n: 0}
              doc.math.push(math)
            }
          }, '']
        }
      }
    }
    
    var script = document.createElement('script')
    script.src = '!{theme.CDN.mathjax}'
    script.id = 'MathJax-script'
    script.async = true
    document.head.appendChild(script)
  } else {
    MathJax.startup.document.state(0)
    MathJax.texReset()
    MathJax.typeset()
  }