diff --git a/frontend/web/assets/js/popo.js b/frontend/web/assets/js/popo.js
index 95602b3..ea8275c 100644
--- a/frontend/web/assets/js/popo.js
+++ b/frontend/web/assets/js/popo.js
@@ -18,6 +18,7 @@ $(function(){
             $('#side-menu .av').eq(arr[i]).removeClass('boo');
         });
         _that.find(".Previous").click(function () {
+            console.log(i);
             _that.addClass("unchoose");
             $(".model-bg").eq(i-1).removeClass("unchoose");
             $('#side-menu .av').eq(arr[i]).addClass('boo');