判断有无 emoji

项目中显示文案超长截取时，当字符中有emoji表情会截取异常，在网上看到一篇博文很好的解决了这个问题，这里简单贴下代码。

export function unicodeCut(val, isSplit) {
  let rsAstralRange = '\\ud800-\\udfff',
      rsZWJ = '\\u200d',
      rsVarRange = '\\ufe0e\\ufe0f',
      rsComboMarksRange = '\\u0300-\\u036f',
      reComboHalfMarksRange = '\\ufe20-\\ufe2f',
      rsComboSymbolsRange = '\\u20d0-\\u20ff',
      rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange;
  let reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');

  let rsFitz = '\\ud83c[\\udffb-\\udfff]',
      rsOptVar = '[' + rsVarRange + ']?',
      rsCombo = '[' + rsComboRange + ']',
      rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
      reOptMod = rsModifier + '?',
      rsAstral = '[' + rsAstralRange + ']',
      rsNonAstral = '[^' + rsAstralRange + ']',
      rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
      rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
      rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
      rsSeq = rsOptVar + reOptMod + rsOptJoin,
      rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
  let reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');

  function hasUnicode (val) {
    return reHasUnicode.test(val);
  }

  function unicodeToArray (val) {
    return val.match(reUnicode) || [];
  }

  function asciiToArray (val) {
    return val.split('');
  }

  return isSplit ? (hasUnicode(val) ? unicodeToArray(val) : asciiToArray(val)) : hasUnicode(val);
}

Tips

原文作者：Wzybnzy
原文链接：js emoji表情长度判断 https://www.cnblogs.com/wzybnzy/p/7569113.html