javascript - js filtering emoticons of WeChat nicknames

Question

WeChat nickname:

1.最多显示8位中文字符/16位英文字符，超出部分用“...”代替，
2.对于无法识别的表情等特殊字符，用“口”代替

Now I encounter an emoticon that cannot be recognized, and I want to filter it into "mouth"; is there anyone who can teach me how to write this js and regular expression

Answer 1

How to find UTF-8 encoded emoticons in JS

Answer 2

Let me tell you my solution first:

// Example name:
var str = "Abc

Answer 3

Bold text Please help. Have you done this?