添加目录

docs/index.html

@@ -14,7 +14,8 @@
 <div id="app"></div>
 <script>
     window.$docsify = {
-      loadSidebar: true
+      loadSidebar: true,
+      subMaxLevel: 2
     }
   </script>
 <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>