diff --git a/2019/12/vue-router.md b/2019/12/vue-router.md
index 590fe91..66bdfc3 100644
--- a/2019/12/vue-router.md
+++ b/2019/12/vue-router.md
@@ -184,4 +184,7 @@ export default {
 
 如果要检测页面跳转，只能用watch 监听 $route对象或者使用beforeRouteUpdate 导航守卫
 
+### 导航守卫
+
+