how to support math formula in github.io markdown?

问题

https://github.com/zhaochenyou/TestMathJax

This is a test project for mathjax. I init /docs/README.md with:

<script type="text/javascript" async
  src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML">
</script>

formula1:
$$n==x$$

formula2: $$n!=x$$

formula3:
\(m==y\)

formula4: \[m!=y\]

formula5:
\\(k==z\\)

formula6: \\[k!=z\\]

but it seems not working at https://zhaochenyou.github.io/TestMathJax/

please help me ?

来源：https://stackoverflow.com/questions/43713030/how-to-support-math-formula-in-github-io-markdown