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Katex error on some case #646

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@gxsshallot

Description

@gxsshallot

My index.html (created by docsify-cli v4.2.1 and only change body part):

<body>
  <div id="app">加载中</div>
  <script>
    window.$docsify = {
      name: '',
      repo: '',
      markdown: {
        gfm: true,
        tables: true,
      },
      plugins: [
        function (hook) {
          hook.beforeEach(function (content) {
            console.log(content);
            return content
              .replace(/\$([\s\S]*?)\$/g, function (m, code) {
                return katex.renderToString(code, {
                  displayMode: false,
                });
              });
          });
        }
      ]
    }
  </script>
  <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.10.0-rc.1/dist/katex.min.js" integrity="sha384-483A6DwYfKeDa0Q52fJmxFXkcPCFfnXMoXblOkJ4JcA8zATN6Tm78UNL72AKk+0O" crossorigin="anonymous"></script>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.10.0-rc.1/dist/katex.min.css" integrity="sha384-D+9gmBxUQogRLqvARvNLmA9hS2x//eK1FhVb9PiU86gmcrBrJAQT8okdJ4LMp2uv" crossorigin="anonymous">
</body>

Markdown file:

$\{x_n\}$,$\lim\limits_{n \rightarrow \infty} x_n = a$

And it displays incorrect:

2018-10-16 12 44 22

Environment:

  • Mac OS X Mojave 10.14
  • Google Chrome v69.0.3497.100 x64
  • katex v0.10.0-rc.1
  • docsify-cli v4.2.1

I found it change x_n to x<em>n.

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