Support MathJax 4 (#985)

_vendors.yml

@@ -27,9 +27,9 @@ prism_line_numbers:
   integrity: sha256-9cmf7tcLdXpKsPi/2AWE93PbZpTp4M4tqzFk+lWomjU=
 mathjax:
   name: mathjax
-  version: 3.2.2
-  file: es5/tex-mml-chtml.js
-  integrity: sha256-MASABpB4tYktI2Oitl4t+78w/lyA+D7b/s9GEP0JOGI=
+  version: 4.1.3
+  file: tex-mml-chtml.js
+  integrity: sha256-ihPtDDm7pTmSF9ViEsItlvsrBTsNkz0MOXMchzOwCQw=
 katex:
   name: katex
   version: 0.16.9

layout/_third-party/math/mathjax.njk

@@ -1,4 +1,5 @@
 {{ next_data('mathjax', theme.math.mathjax, {
-  js: theme.vendors.mathjax
+  js: theme.vendors.mathjax,
+  font_path: theme.vendors.mathjax_font_path
 }) }}
 {{ next_js('third-party/math/mathjax.js') }}

scripts/events/lib/vendors.js

@@ -57,5 +57,10 @@ module.exports = hexo => {
       // Omit integrity for local assets.
       integrity: plugins === 'local' ? undefined : value.integrity
     };
+    if (key === 'mathjax') {
+      vendors.mathjax_font_path = plugins === 'local'
+        ? url_for.call(hexo, 'lib/@mathjax/mathjax-newcm-font')
+        : undefined;
+    }
   }
 };

source/js/third-party/math/mathjax.js

@@ -20,7 +20,10 @@ document.addEventListener('page:loaded', () => {
             });
           }, '', false]
         }
-      }
+      },
+      output: CONFIG.mathjax.font_path ? {
+        fontPath: CONFIG.mathjax.font_path
+      } : {}
     };
     NexT.utils.getScript(CONFIG.mathjax.js, {
       attributes: {