diff --git a/application/views/mobile_first/ah-pc.php b/application/views/mobile_first/ah-pc.php
index ea7918b8..49fbb4b2 100644
--- a/application/views/mobile_first/ah-pc.php
+++ b/application/views/mobile_first/ah-pc.php
@@ -654,6 +654,21 @@
             }, 10000);
         }
     </script>
+  <script>
+    (function (w, d, i) {
+      var navbar = d.getElementById(i);
+      var prevScrollpos = w.pageYOffset;
+      w.onscroll = function() {
+        var currentScrollPos = w.pageYOffset;
+        if (prevScrollpos > currentScrollPos) {
+          navbar.style.top = '0';
+        } else {
+          navbar.style.top = '-100px';
+        }
+        prevScrollpos = currentScrollPos;
+      }
+    })(window, document, 'header');
+  </script>
 
  <!--newsletter表单 JS-->
 <script src="https://www.recaptcha.net/recaptcha/enterprise.js?render=6Lf828MhAAAAANNetijCXKwW5ARyhcJ-b1Hhslja"></script>
diff --git a/application/views/mobile_first/ch-pc.php b/application/views/mobile_first/ch-pc.php
index c0c7c1a8..31fde450 100644
--- a/application/views/mobile_first/ch-pc.php
+++ b/application/views/mobile_first/ch-pc.php
@@ -707,7 +707,21 @@
             }, 10000);
         }
     </script>
-
+  <script>
+    (function (w, d, i) {
+      var navbar = d.getElementById(i);
+      var prevScrollpos = w.pageYOffset;
+      w.onscroll = function() {
+        var currentScrollPos = w.pageYOffset;
+        if (prevScrollpos > currentScrollPos) {
+          navbar.style.top = '0';
+        } else {
+          navbar.style.top = '-100px';
+        }
+        prevScrollpos = currentScrollPos;
+      }
+    })(window, document, 'header');
+  </script>
 <!--newsletter表单 JS-->
 <script src="https://www.recaptcha.net/recaptcha/enterprise.js?render=6Lf828MhAAAAANNetijCXKwW5ARyhcJ-b1Hhslja"></script>
 <script>
diff --git a/application/views/mobile_first/gh-pc.php b/application/views/mobile_first/gh-pc.php
index f4eae6ba..35cc2b77 100644
--- a/application/views/mobile_first/gh-pc.php
+++ b/application/views/mobile_first/gh-pc.php
@@ -480,6 +480,21 @@
             }, 10000);
         }
     </script>
+  <script>
+    (function (w, d, i) {
+      var navbar = d.getElementById(i);
+      var prevScrollpos = w.pageYOffset;
+      w.onscroll = function() {
+        var currentScrollPos = w.pageYOffset;
+        if (prevScrollpos > currentScrollPos) {
+          navbar.style.top = '0';
+        } else {
+          navbar.style.top = '-100px';
+        }
+        prevScrollpos = currentScrollPos;
+      }
+    })(window, document, 'header');
+  </script>
 
     <!--PC底部 结束-->