Updated.

book.toml

@@ -11,7 +11,6 @@ additional-css = ["theme/pagetoc.css"]
 additional-js  = ["theme/pagetoc.js"]
 git-repository-url = "https://github.com/gnu4cn/rust-lang-zh_CN"
 git-repository-icon = "fa-github"
-input-404 = "not-found.md"
 
 [output.html.print]
 enable = false

src/404.md

@@ -0,0 +1,9 @@
+# 文档未找到（404）
+
+**Document not found(404)**
+
+抱歉，此 URL 无效。请使用导航栏或搜索继续。
+
+
+This URL is invalid, sorry. Please use the navigation bar or search to continue.
+<script\>console.log("test embedding javascript in markdown file.");</script\>