js emoji 过滤

function filteremoji(emojireg){
  var ranges = [
    '\ud83c[\udf00-\udfff]',
    '\ud83d[\udc00-\ude4f]',
    '\ud83d[\ude80-\udeff]'
  ];
  emojiregRe = emojireg .replace(new RegExp(ranges.join('|'), 'g'), '');
  return emojiregRe;
}