Fix share bug. reviewed by redding.

@@ -167,7 +167,7 @@ export function onRightPressed(sid) {
                     }
                 }
                 let title = item.postsTitle||contentStr||'潮流社区';
-                let content = item.authorInfo.nickName||''+'在潮流社区发布的潮流主题帖很赞，快来看看！'
+                let content = (item.authorInfo.nickName||'')+'在潮流社区发布的潮流主题帖很赞，快来看看！'
                 let shareInfo = {
                     title,
                     content,
@@ -175,9 +175,7 @@ export function onRightPressed(sid) {
                     linkUrl: item.shareUrl,
                 }
                 dispatch(doShare(sid,shareInfo));
-            } else {
-                Alert.alert('提示','获取分享信息失败');
-            }
+            } 
         }
     }
 }