AH移动端头部导航增加浮动和固定切换

application/views/mobile_first/ah.php

@@ -654,6 +654,21 @@
         return result;
       }
     </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>
 
   </footer>
   <!--移动底部 结束-->