在MathJax完成排版后，可以通过包含

You can cause a function to run after MathJax finishes typesetting by including

<script>
MathJax.Hub.Queue(function () {
  ... your code here...
});
</script>

在HTML文件中，该脚本位于加载MathJax.js本身的脚本之后.

in your HTML file after the script that loads MathJax.js itself.