[JIM.shared initWithAppKey:@"appkey"];
[JIM.shared.connectionManager connectWithToken:@"token1"];
[JIM.shared.connectionManager addDelegate:self];
- (void)connectionStatusDidChange:(JConnectionStatus)status errorCode:(JErrorCode)code extra:(NSString *)extra {
    if (JConnectionStatusConnected == status) {
        //文本消息
        JConversation *conversation = [[JConversation alloc] initWithConversationType:JConversationTypePrivate conversationId:@"userid2"];
        JTextMessage *text = [[JTextMessage alloc] initWithContent:@"test text message"];
        JMessage *m = [JIM.shared.messageManager sendMessage:text
                                              inConversation:conversation
                                                     success:^(JMessage *message) {
                NSLog(@"sendMessage success");
            } error:^(JErrorCode errorCode, JMessage *message) {
                NSLog(@"sendMessage error");
            }];
        NSLog(@"after send, m.clientMsgNo is %lld", m.clientMsgNo);
    }
}