diff --git a/commons/basic/src/main/ets/utils/ChangeUtil.ets b/commons/basic/src/main/ets/utils/ChangeUtil.ets
index b87e1d4..0781c04 100644
--- a/commons/basic/src/main/ets/utils/ChangeUtil.ets
+++ b/commons/basic/src/main/ets/utils/ChangeUtil.ets
@@ -188,5 +188,13 @@ export class ChangeUtil {
     const g = parseInt(hex.slice(3, 5), 16);
     const b = parseInt(hex.slice(5, 7), 16);
     return `rgba(${r}, ${g}, ${b}, ${alpha})`;
-  };
+  }
+
+  static stringIsUndefinedAndNull (string:string | undefined):boolean {
+    if (string == undefined || string == "null" || string == "<null>" || string == "(null)" || string == 'undefined' || string.length <= 0) {
+      return true
+    } else {
+      return false
+    }
+  }
 }
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