diff --git a/README.md b/README.md
index 4101d7f..f8dc09b 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![Build Status](https://cloud.drone.io/api/badges/v7lin/fake_weibo/status.svg)](https://cloud.drone.io/v7lin/fake_weibo)
 [![GitHub tag](https://img.shields.io/github/tag/v7lin/fake_weibo.svg)](https://github.com/v7lin/fake_weibo/releases)
+[![pub package](https://img.shields.io/pub/v/fake_weibo.svg)](https://pub.dartlang.org/packages/fake_weibo)
 
 flutter版新浪微博SDK
 
diff --git a/lib/fake_weibo.dart b/lib/fake_weibo.dart
index eda5095..fad4273 100644
--- a/lib/fake_weibo.dart
+++ b/lib/fake_weibo.dart
@@ -398,9 +398,9 @@ class FakeWeibo {
     }).then((HttpClientResponse response) async {
       if (response.statusCode == HttpStatus.ok) {
         String content = await utf8.decodeStream(response);
-        Map<dynamic, dynamic> map = json.decode(content);
+        Map<dynamic, dynamic> map = json.decode(content) as Map<dynamic, dynamic>;
         int errorCode = map.containsKey(FakeWeiboApiBaseResp.KEY_ERROR_CODE)
-            ? map[FakeWeiboApiBaseResp.KEY_ERROR_CODE]
+            ? map[FakeWeiboApiBaseResp.KEY_ERROR_CODE] as int
             : FakeWeiboApiBaseResp.ERROR_CODE_SUCCESS;
         if (errorCode == FakeWeiboApiBaseResp.ERROR_CODE_SUCCESS) {
           return FakeWeiboApiUserResp._(