diff --git a/frontend/web/assets/js/popo.js b/frontend/web/assets/js/popo.js
index 25e9f79..c496639 100644
--- a/frontend/web/assets/js/popo.js
+++ b/frontend/web/assets/js/popo.js
@@ -17,7 +17,7 @@ $(function(){
             console.log(key);
             _that.addClass("unchoose");
             $(".model-bg").eq(i+1).removeClass("unchoose");
-            $('#side-menu .av').eq(arr[i]).addClass('boo').parent(arr[i-1]).removeClass('boo');
+            $('#side-menu .av').eq(arr[i+1]).addClass('boo').eq(arr[i]).removeClass('boo');
         });
         _that.find(".Previous").click(function () {
             _that.addClass("unchoose");