the-swift-programming-language-in-chinese/gitbook/plugins/gitbook-plugin-mathjax/plugin.js

require(["gitbook"], function(gitbook) {
    MathJax.Hub.Config({
        tex2jax: {
            inlineMath: [['$','$'], ['\\(','\\)']],
            processEscapes: true
        }
    });


    gitbook.events.bind("page.change", function() {
        MathJax.Hub.Typeset()
    });
});