emojiTranslateInJavascript

emojiTranslate.js

  // 表情转码
  utf16toEntities(str) {
    var patt = /[\ud800-\udbff][\udc00-\udfff]/g;
    // 检测utf16字符正则
    str = str.replace(patt, function (char) {
      var H, L, code;
      if (char.length === 2) {
        H = char.charCodeAt(0);
        // 取出高位
        L = char.charCodeAt(1);
        // 取出低位
        code = (H - 0xD800) * 0x400 + 0x10000 + L - 0xDC00;
        // 转换算法
        return "&#" + code + ";";
      } else {
        return char;
      }
    });
    return str;
  },
  
  //表情解码
  uncodeUtf16(str) {
    var reg = /\&#.*?;/g;
    var result = str.replace(reg, function (char) {
      var H, L, code;
      if (char.length == 9) {
        code = parseInt(char.match(/[0-9]+/g));
        H = Math.floor((code - 0x10000) / 0x400) + 0xD800;
        L = (code - 0x10000) % 0x400 + 0xDC00;
        return unescape("%u" + H.toString(16) + "%u" + L.toString(16));
      } else {
        return char;
      }
    });
    return result;
  },