使用Mathjax新增对数学公式的支持 (#88)

* 新增数学公式配置选项

* add

* add mathjax.ejs

* Update _config.yml

* Update mathjax.ejs

Co-authored-by: xaoxuu <16400144+xaoxuu@users.noreply.github.com>

_config.yml

@@ -84,7 +84,6 @@ article:
     auto_cover: true # 如果没有封面就根据 tags 作为关键词搜索封面，开了此项将不会自动从文章中提取首张图片作为封面了。
 
 
-
 ######## Comments ########
 comments:
   service: # beaudar, utterances, valine, twikoo, waline
@@ -303,6 +302,13 @@ plugins:
     enable: false
     css: https://unpkg.com/heti/umd/heti.min.css
     js: https://unpkg.com/heti/umd/heti-addon.min.js
+    
+  # MathJax
+  # 需在Markdown文件开头加入mathjax: true
+  # 推荐使用Pandoc: npm uninstall hexo-renderer-marked --save & npm install hexo-renderer-pandoc --save
+  mathjax:
+    enable: false
+    cdn: https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.6/MathJax.js?config=TeX-AMS-MML_HTMLorMML
 
 
 style:

layout/mathjax.ejs

@@ -0,0 +1,29 @@
+<% if (theme.plugins.mathjax.enable){ %>
+    <script type="text/x-mathjax-config">
+      MathJax.Hub.Config({
+          tex2jax: {
+            inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+            processEscapes: true
+          }
+        });
+      </script>
+
+    <script type="text/x-mathjax-config">
+      MathJax.Hub.Config({
+            tex2jax: {
+              skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
+            }
+          });
+      </script>
+
+    <script type="text/x-mathjax-config">
+      MathJax.Hub.Queue(function() {
+              var all = MathJax.Hub.getAllJax(), i;
+              for(i=0; i < all.length; i += 1) {
+                  all[i].SourceElement().parentNode.className += ' has-jax';
+              }
+          });
+      </script>
+
+    <script type="text/javascript" src="<%- theme.plugins.mathjax.cdn %>"></script>
+<% } %>

layout/post.ejs

@@ -19,6 +19,9 @@ if (theme.plugins.heti && theme.plugins.heti.enable) {
   heti = ' heti';
 }
 %>
+<% if (page.mathjax == true){ %>
+    <%- partial('mathjax') %>
+<% } %>
 <%- partial('_partial/main/navbar/breadcrumb') %>
 <article class='content<%- heti %> md <%- post.layout %><%- post.indent ? ' indent' : '' %><%- scrollreveal() %>'>
 <%- layoutTitle() %>