精确导入特定语言的highlight.js库相关文件，减少最终打包文件体积。

src/routes/main/modules/api-doc/code.js

 import React from 'react';
 import PropTypes from 'prop-types';
 import cs from 'classnames';
-import hljs from 'highlight.js';
+import hljs from 'highlight.js/lib/highlight';
+import langJson from 'highlight.js/lib/languages/json';
+import langJavascript from 'highlight.js/lib/languages/javascript';
 import 'highlight.js/styles/github.css';
 
+hljs.registerLanguage('json', langJson);
+hljs.registerLanguage('javascript', langJavascript);
+
 class Code extends React.Component {
   componentDidMount() {
     this.highlightCode();