How does WeChat show the other party's' entry'?

Wechat shows that the other party is typing, indicating that the other party is typing.

Wechat function service:

Chat: It supports sending voice messages, videos, pictures (including facial expressions) and texts. Is a kind of chat software, which supports multi-group chat (group chat of up to 40 people, 100 people, and 200 people is being tested).

Add friends: wechat supports finding micro signals (specific steps: click on friends at the bottom of wechat interface-> add friends-> search number, then enter the number of wechat to be searched, and then click find), check QQ friends to add friends, check the phone address book to share micro signals to add friends, shake to add friends, add friends by QR code search, and accept friends by drift bottle.

Real-time intercom function: users can talk to a group of people through a voice chat room, but unlike voice sending in a group, the messages in this chat room are almost real-time, without leaving any records, and they can still chat in real time when the screen of the mobile phone is closed.

Wechat payment: It is a payment function integrated in the WeChat client, and users can complete the fast payment process through their mobile phones. Wechat payment provides users with safe, fast and efficient payment services, based on fast payment of bank cards.

WeChat red envelope: After the release of WeChat 6. 1 version, you can chat and get a red envelope in the dialog box.

Red envelope withdrawal: After entering WeChat My Wallet, click Change, enter the amount to be withdrawn, and click Next to successfully submit the withdrawal application.