diff --git a/assets/javascripts/app.js b/assets/javascripts/app.js
index d25c429..62c8615 100644
--- a/assets/javascripts/app.js
+++ b/assets/javascripts/app.js
@@ -465,6 +465,25 @@
     //   $('.header-buttom').appendTo($('.dropdowns'));
     // }
   function forFreeGo() {
+    if (document.documentElement.lang === 'zh_tw') {
+      document.documentElement.lang = 'zh-Hant';
+    }    
+    //tab鍵按下
+    $(document).on('keydown', function(e) {
+      if (e.key === "Tab" || e.keyCode === 9) {
+        $('.header-nav, .dropdowns').css('display', 'block');
+      }
+    });
+
+    //li被hover
+    $('li').hover(
+      function() {
+        $(this).children('ul').addClass('show');
+      },
+      function() {
+        $(this).children('ul').removeClass('show');
+      }
+    );
     //刪除空的h1
     $('h1').each(function() {
       if ($(this).text().trim() === '') {