javascript - Unicode Strings

 
function encodeUnicode(str) {
  // First we use encodeURIComponent to get percent-encoded UTF-8,
  // then we convert the percent encodings into raw bytes which
  // can be fed into btoa.
  return btoa(
    encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function toSolidBytes(match, p1) {
      return String.fromCharCode('0x' + p1)
    })
  )
}
 
function decodeUnicode(str) {
  // Going backward: from byte-stream to percent-encoding, to original string.
  return decodeURIComponent(
    atob(str)
      .split('')
      .map(function (c) {
        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
      })
      .join('')
  )
}