客服会话---自带会话内容

      <button class="connect-kf" open-type="contact" bindcontact="handleContact" show-message-card="true" send-message-title="我要加入学习群" send-message-img="/images/guide/goGroup.jpg"></button>

参考https://www.jianshu.com/p/ab0f5ed1d8b9