add theme

themes/butterfly/scripts/events/404.js

@@ -0,0 +1,20 @@
+/**
+ * Butterfly
+ * 404 error page
+ */
+
+'use strict'
+
+hexo.extend.generator.register('404', function (locals) {
+  if (!hexo.theme.config.error_404.enable) return
+  return {
+    path: '404.html',
+    layout: ['page'],
+    data: {
+      type: '404',
+      top_img: false,
+      comments: false,
+      aside: false
+    }
+  }
+})