1.在hexo/_config.yml末尾添加一段代码

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math:
  engine: 'mathjax' # or 'katex'
  mathjax:
    # src: custom_mathjax_source
    config:
      # MathJax config

2.修改next/_config.yml中mathjax的设置

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# Math Formulas Render Support
math:
  # Default (true) will load mathjax / katex script on demand.
  # That is it only render those page which has `mathjax: true` in Front-matter.
  # If you set it to false, it will load mathjax / katex srcipt EVERY PAGE.
  per_page: false

  # hexo-renderer-pandoc (or hexo-renderer-kramed) required for full MathJax support.
  mathjax:
    enable: true
    # See: https://mhchem.github.io/MathJax-mhchem/
    mhchem: false

vendors:
  mathjax: //cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML

注意：如果per_page:false则md文件前面要加上mathjax:true

3.额外装hexo-filter-mathjax

$ npm i hexo-filter-mathjax