diff --git a/TC1/http_server/web/index.html b/TC1/http_server/web/index.html
index 0a4af55..6da3d88 100644
--- a/TC1/http_server/web/index.html
+++ b/TC1/http_server/web/index.html
@@ -960,7 +960,7 @@
         .attr('data-val', -1)
         .text("未设置")
     );
-    for (let i = 0; i <= BTN_OPERATIONS.length; i++) {
+    for (let i = 0; i < BTN_OPERATIONS.length; i++) {
     $('#btn_action_selector').append(
       $('<li>')
         .addClass('mdl-menu__item')