微信扫一扫二维码关注公众号，注册账号之后可以获取二维码，二维码作为出入凭证，凭借二维码才能出入会场，在注册过程中就达到了人员信息采集的目的(WeChat sweeps two dimensional code to pay attention to the public number. After registered account, two dimensional code can be obtained. As a certificate of entry and exit, two di