在普通对话时，可以点右上角的用户头像，点“…”，然后选择启用自动删除，之后选择想要自动清除聊天记录的时间即可。 群发消息,可以帮助企业向大量的用户发送定制化的消息，无需逐个发送，大大提升了工作效率。 简介：大虾本职工作为程序员，本频道持

Thumbnail of the file despatched; is often disregarded if thumbnail generation for the file is supported server-facet. The thumbnail need to be in JPEG format and lower than 200 kB in size. A thumbnail's width and top should not exceed 320. . True, Should the user joined the chat immediately after sending a immediate join ask for without employing