diff --git a/src/case/ztree/jquery.ztree.excheck-3.5.js b/src/case/ztree/jquery.ztree.excheck-3.5.js
index 9efb23a9d..24f66b5ac 100644
--- a/src/case/ztree/jquery.ztree.excheck-3.5.js
+++ b/src/case/ztree/jquery.ztree.excheck-3.5.js
@@ -489,7 +489,7 @@ import $ from "jquery";
                     r = consts.radio,
                     checkboxType = setting.check.chkboxType;
                 var notEffectByOtherNode = checkboxType.Y === "" && checkboxType.N === "";
-                fullStyle = "";
+                var fullStyle = "";
                 if (node.chkDisabled === true) {
                     fullStyle = c.DISABLED;
                 } else if (node.halfCheck) {