base64encode转换

/**
* base64
*/
function base64encode(str) {
    var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    var out, i, len;
    var c1, c2, c3;

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
      c1 = str.charCodeAt(i++) & 0xff;
      if(i == len)
      {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt((c1 & 0x3) << 4);
        out += "==";
        break;
      }
      c2 = str.charCodeAt(i++);
      if(i == len)
      {
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
        out += base64EncodeChars.charAt((c2 & 0xF) << 2);
        out += "=";
        break;
      }
      c3 = str.charCodeAt(i++);
      out += base64EncodeChars.charAt(c1 >> 2);
      out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
      out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
      out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
  }

  function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;
    var base64DecodeChars = [
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
      52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
      -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
      15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
      -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
      41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
    ];

    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
      /* c1 */
      do {
        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
      } while(i < len && c1 == -1);
      if(c1 == -1)
        break;

      /* c2 */
      do {
        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
      } while(i < len && c2 == -1);
      if(c2 == -1)
        break;

      out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

      /* c3 */
      do {
        c3 = str.charCodeAt(i++) & 0xff;
        if(c3 == 61)
          return out;
        c3 = base64DecodeChars[c3];
      } while(i < len && c3 == -1);
      if(c3 == -1)
        break;

      out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

      /* c4 */
      do {
        c4 = str.charCodeAt(i++) & 0xff;
        if(c4 == 61)
          return out;
        c4 = base64DecodeChars[c4];
      } while(i < len && c4 == -1);
      if(c4 == -1)
        break;
      out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
    }
    return out;
  }