The method of JS judging and filtering emoji expression

First, JS to determine whether the text has emoji expression

Isemojicharacter (substring) {for (var i = 0; I <substring.length; i + +) {var hs = Substring.charcode          at (i); if (0xd800 <= HS && HS <= 0XDBFF) {if (substring.length> 1) {var ls = su                  Bstring.charcodeat (i + 1);                  var UC = ((hs-0xd800) * 0x400) + (LS-0XDC00) + 0x10000;                   if (0x1d000 <= UC && UC <= 0x1f77f) {returns true;              }}} otherwise if (substring.length> 1) {var ls = substring.charcodeat (i + 1);               if (ls = = 0x20e3) {returns true;               }} else {if (0x2100 <= HS && HS <= 0X27FF) {returns true;               } else if (0x2b05 <= HS && HS <= 0x2b07) {returns true;               } else if (0x2934 <= HS && HS <= 0x2935) {returns true; } else if (0x3297 <= HS && HS <= 0x3299) {returns true; } else if (hs = = 0XA9 | | HS = = 0xae | | HS = = 0x303d | | HS = = 0x3030 | | HS = = 0x2b55 | | HS = = 0x2b1c | | HS = = 0x2b1b | |               HS = = 0X2B50) {returns true;  }          }      }  }

Second, JS file filter emoji Emoticons

    使用JS过滤表情符号表情的主要原因：输入标签中输入表情符号表情，表单提交后插入数据库。报错原因:        因为UTF-8编码有可能是两个，三个，四个字节.Emoji表情是4个字节，而MySQL的utf8编码最多3个字节，所以数据插不进去。        于是找到两个解决方案：          1.将Mysql的编码从utf8转换成utf8mb4          2.前端JS校验过滤掉emoji表情

The method of JS judging and filtering emoji expression