[fix] mathjax render (#532)

scripts/tags/lib/box.js

@@ -22,7 +22,7 @@ module.exports = ctx => function(args, content) {
   el += '>'
   // title
   if (title && title.length > 0) {
-    el += '<div class="title"><strong>' + title + '</strong></div>'
+    el += '<div class="title"><strong>' + ctx.render.renderSync({text: title, engine: 'markdown'}) + '</strong></div>'
   }
   // content
   el += '<div class="body">'

scripts/tags/lib/folders.js

@@ -39,7 +39,7 @@ module.exports = ctx => function(args, content) {
     nodes.forEach((node, i) => {
       el += '<details class="folder" index="' + (i) + '">'
       // summary
-      el += '<summary><span>' + (node.header || '') + '</span></summary>'
+      el += '<summary>' + ctx.render.renderSync({text: (node.header || ''), engine: 'markdown'}) + '</summary>'
       // content
       el += '<div class="body">'
       el += ctx.render.renderSync({text: (node.body || ''), engine: 'markdown'}).split('\n').join('')

scripts/tags/lib/folding.js

@@ -20,7 +20,7 @@ module.exports = ctx => function(args, content) {
   }
   el += '>'
   // summary
-  el += '<summary><span>' + (args.title || '') + '</span></summary>'
+  el += '<summary>' + ctx.render.renderSync({text: (args.title || ''), engine: 'markdown'}) + '</summary>'
   // content
   el += '<div class="body">'
   el += ctx.render.renderSync({text: content, engine: 'markdown'}).split('\n').join('')