fix

helper/LjApiHelper.js

@@ -64,7 +64,7 @@ class LjApiHelper
      */
     static getApiForDelDownload(lessonId,data)
     {
-        return "http://tt-web.api.ai160.com/callback/download/delete?lessonId=" + lessonId+"&mac="+macAddressStr+"&data="+data;
+        return "http://tt-web.api.ai160.com/callback/download/delete?lessonId=" + lessonId+"&mac="+macAddressStr;
     }
 
     /**