diff --git a/packages/demo/src/demo/case/combo/demo.text_value_combo.js b/packages/demo/src/demo/case/combo/demo.text_value_combo.js
index aff1e4efa..6c16c4d03 100644
--- a/packages/demo/src/demo/case/combo/demo.text_value_combo.js
+++ b/packages/demo/src/demo/case/combo/demo.text_value_combo.js
@@ -19,9 +19,9 @@ export class TextValueComboDemo extends Widget {
     };
 
     render() {
-        var combo1, combo2;
+        let combo, combo1, combo2;
 
-        var items = [
+        const items = [
             {
                 text: "MVC-1",
                 iconCls: "date-font",