网页渲染markdown（markdown-it） 可查看

npm install markdown-it --save

import MarkdownIt  from "markdown-it"

const markdownStr = 'xxxx'; // 需要渲染的markdown字符串
const md = new MarkdownIt();
const result = md.render(markdownStr);
return <div className="App" dangerouslySetInnerHTML={{__html: result}}></div>

import hljs from "highlight.js";
  const md = new MarkdownIt({
   highlight: function (str, lang) {
     if (lang && hljs.getLanguage(lang)) {
      try {
        return hljs.highlight(lang, str).value;
      } catch (__) {}
     }

     return '';
   }
  });
  const result = md.render(str);