diff --git a/scripts/filter.js b/scripts/filter.js
new file mode 100644
index 0000000..88f4cc3
--- /dev/null
+++ b/scripts/filter.js
@@ -0,0 +1,11 @@
+// 替换markdown中图片路径的正则
+const mdImageRegex = /\]\s*\((?=(?!http).*?\))/gi
+// 替换所有HTML标签的正则
+hexo.extend.filter.register('before_post_render', function(article){
+  // article.raw 是原始的文件内容
+  // article.content 是处理过代码块语法高亮的内容
+  if(hexo.config.picture_cdn) {
+    article.content = article.content.replace(mdImageRegex, `](${hexo.config.picture_cdn}`)
+  }
+  return article
+})
\ No newline at end of file