前端生成MD5唯一id

/*
 * @Author: baolong
 * @Date: 2020-04-07 10:47:17
 * @Description: 生成md5
 * @string: 特殊生成字段，如果没有可用时间戳代替
 * @timer： 是否在string基础上加上时间戳防止重复
 */
function MD5(string, timer) {
  if (timer) {
    string = `${ string }_${ new Date().getTime() }`
  }
  function md5_RotateLeft(lValue, iShiftBits) {
    return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits))
  }
  function md5_AddUnsigned(lX, lY) {
    var lX4, lY4, lX8, lY8, lResult
    lX8 = (lX & 0x80000000)
    lY8 = (lY & 0x80000000)
    lX4 = (lX & 0x40000000)
    lY4 = (lY & 0x40000000)
    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF)
    if (lX4 & lY4) {
      return (lResult ^ 0x80000000 ^ lX8 ^ lY8)
    }
    if (lX4 | lY4) {
      if (lResult & 0x40000000) {
        return (lResult ^ 0xC0000000 ^ lX8 ^ lY8)
      } else {
        return (lResult ^ 0x40000000 ^ lX8 ^ lY8)
      }
    } else {
      return (lResult ^ lX8 ^ lY8)
    }
  }
  function md5_F(x, y, z) {
    return (x & y) | ((~x) & z)
  }
  function md5_G(x, y, z) {
    return (x & z) | (y & (~z))
  }
  function md5_H(x, y, z) {
    return (x ^ y ^ z)
  }
  function md5_I(x, y, z) {
    return (y ^ (x | (~z)))
  }
  function md5_FF(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac))
    return md5_AddUnsigned(md5_RotateLeft(a, s), b)
  }
  function md5_GG(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac))
    return md5_AddUnsigned(md5_RotateLeft(a, s), b)
  }
  function md5_HH(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac))
    return md5_AddUnsigned(md5_RotateLeft(a, s), b)
  }
  function md5_II(a, b, c, d, x, s, ac) {
    a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac))
    return md5_AddUnsigned(md5_RotateLeft(a, s), b)
  }
  function md5_ConvertToWordArray(string) {
    var lWordCount
    var lMessageLength = string.length
    var lNumberOfWords_temp1 = lMessageLength + 8
    var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64
    var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16
    var lWordArray = Array(lNumberOfWords - 1)
    var lBytePosition = 0
    var lByteCount = 0
    while (lByteCount < lMessageLength) {
      lWordCount = (lByteCount - (lByteCount % 4)) / 4
      lBytePosition = (lByteCount % 4) * 8
      lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition))
      lByteCount++
    }
    lWordCount = (lByteCount - (lByteCount % 4)) / 4
    lBytePosition = (lByteCount % 4) * 8
    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition)
    lWordArray[lNumberOfWords - 2] = lMessageLength << 3
    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29
    return lWordArray
  }
  function md5_WordToHex(lValue) {
    var WordToHexValue = ''; var WordToHexValue_temp = ''; var lByte; var lCount
    for (lCount = 0; lCount <= 3; lCount++) {
      lByte = (lValue >>> (lCount * 8)) & 255
      WordToHexValue_temp = '0' + lByte.toString(16)
      WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2)
    }
    return WordToHexValue
  }
  function md5_Utf8Encode(string) {
    string = string.replace(/\r\n/g, '\n')
    var utftext = ''
    for (var n = 0; n < string.length; n++) {
      var c = string.charCodeAt(n)
      if (c < 128) {
        utftext += String.fromCharCode(c)
      } else if ((c > 127) && (c < 2048)) {
        utftext += String.fromCharCode((c >> 6) | 192)
        utftext += String.fromCharCode((c & 63) | 128)
      } else {
        utftext += String.fromCharCode((c >> 12) | 224)
        utftext += String.fromCharCode(((c >> 6) & 63) | 128)
        utftext += String.fromCharCode((c & 63) | 128)
      }
    }
    return utftext
  }
  var x = Array()
  var k, AA, BB, CC, DD, a, b, c, d
  var S11 = 7; var S12 = 12; var S13 = 17; var S14 = 22
  var S21 = 5; var S22 = 9; var S23 = 14; var S24 = 20
  var S31 = 4; var S32 = 11; var S33 = 16; var S34 = 23
  var S41 = 6; var S42 = 10; var S43 = 15; var S44 = 21
  string = md5_Utf8Encode(string)
  x = md5_ConvertToWordArray(string)
  a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476
  for (k = 0; k < x.length; k += 16) {
    AA = a; BB = b; CC = c; DD = d
    a = md5_FF(a, b, c, d, x[k + 0], S11, 0xD76AA478)
    d = md5_FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756)
    c = md5_FF(c, d, a, b, x[k + 2], S13, 0x242070DB)
    b = md5_FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE)
    a = md5_FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF)
    d = md5_FF(d, a, b, c, x[k + 5], S12, 0x4787C62A)
    c = md5_FF(c, d, a, b, x[k + 6], S13, 0xA8304613)
    b = md5_FF(b, c, d, a, x[k + 7], S14, 0xFD469501)
    a = md5_FF(a, b, c, d, x[k + 8], S11, 0x698098D8)
    d = md5_FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF)
    c = md5_FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1)
    b = md5_FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE)
    a = md5_FF(a, b, c, d, x[k + 12], S11, 0x6B901122)
    d = md5_FF(d, a, b, c, x[k + 13], S12, 0xFD987193)
    c = md5_FF(c, d, a, b, x[k + 14], S13, 0xA679438E)
    b = md5_FF(b, c, d, a, x[k + 15], S14, 0x49B40821)
    a = md5_GG(a, b, c, d, x[k + 1], S21, 0xF61E2562)
    d = md5_GG(d, a, b, c, x[k + 6], S22, 0xC040B340)
    c = md5_GG(c, d, a, b, x[k + 11], S23, 0x265E5A51)
    b = md5_GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA)
    a = md5_GG(a, b, c, d, x[k + 5], S21, 0xD62F105D)
    d = md5_GG(d, a, b, c, x[k + 10], S22, 0x2441453)
    c = md5_GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681)
    b = md5_GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8)
    a = md5_GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6)
    d = md5_GG(d, a, b, c, x[k + 14], S22, 0xC33707D6)
    c = md5_GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87)
    b = md5_GG(b, c, d, a, x[k + 8], S24, 0x455A14ED)
    a = md5_GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905)
    d = md5_GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8)
    c = md5_GG(c, d, a, b, x[k + 7], S23, 0x676F02D9)
    b = md5_GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A)
    a = md5_HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942)
    d = md5_HH(d, a, b, c, x[k + 8], S32, 0x8771F681)
    c = md5_HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122)
    b = md5_HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C)
    a = md5_HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44)
    d = md5_HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9)
    c = md5_HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60)
    b = md5_HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70)
    a = md5_HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6)
    d = md5_HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA)
    c = md5_HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085)
    b = md5_HH(b, c, d, a, x[k + 6], S34, 0x4881D05)
    a = md5_HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039)
    d = md5_HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5)
    c = md5_HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8)
    b = md5_HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665)
    a = md5_II(a, b, c, d, x[k + 0], S41, 0xF4292244)
    d = md5_II(d, a, b, c, x[k + 7], S42, 0x432AFF97)
    c = md5_II(c, d, a, b, x[k + 14], S43, 0xAB9423A7)
    b = md5_II(b, c, d, a, x[k + 5], S44, 0xFC93A039)
    a = md5_II(a, b, c, d, x[k + 12], S41, 0x655B59C3)
    d = md5_II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92)
    c = md5_II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D)
    b = md5_II(b, c, d, a, x[k + 1], S44, 0x85845DD1)
    a = md5_II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F)
    d = md5_II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0)
    c = md5_II(c, d, a, b, x[k + 6], S43, 0xA3014314)
    b = md5_II(b, c, d, a, x[k + 13], S44, 0x4E0811A1)
    a = md5_II(a, b, c, d, x[k + 4], S41, 0xF7537E82)
    d = md5_II(d, a, b, c, x[k + 11], S42, 0xBD3AF235)
    c = md5_II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB)
    b = md5_II(b, c, d, a, x[k + 9], S44, 0xEB86D391)
    a = md5_AddUnsigned(a, AA)
    b = md5_AddUnsigned(b, BB)
    c = md5_AddUnsigned(c, CC)
    d = md5_AddUnsigned(d, DD)
  }
  return (md5_WordToHex(a) + md5_WordToHex(b) + md5_WordToHex(c) + md5_WordToHex(d)).toLowerCase()
}
export default MD5