js.js

 function code(s, discard, alpha, beta, w1, w2) {
        s = String(s);
        var buffer = 0,
            i = 0,
            length = s.length,
            result = '',
            bitsInBuffer = 0;

        while(i < length) {
            var c = s.charCodeAt(i);
            c = c < 256 ? alpha[c] : -1;

            buffer = (buffer << w1) + c;
            bitsInBuffer += w1;

            while(bitsInBuffer >= w2) {
                bitsInBuffer -= w2;
                var tmp = buffer >> bitsInBuffer;
                result += beta.charAt(tmp);
                buffer ^= tmp << bitsInBuffer;
            }
            ++i;
        }
        if(!discard && bitsInBuffer > 0) result += beta.charAt(buffer << (w2 - bitsInBuffer));
        return result;
    }
var UTF8 = {

        /**
         * Encode multi-byte Unicode string into utf-8 multiple single-byte characters
         * (BMP / basic multilingual plane only)
         *
         * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
         *
         * @param {String} strUni Unicode string to be encoded as UTF-8
         * @returns {String} encoded string
         */
        encode: function(strUni) {
            // use regular expressions & String.replace callback function for better efficiency
            // than procedural approaches
            var strUtf = strUni.replace(/[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
            function(c) {
                var cc = c.charCodeAt(0);
                return String.fromCharCode(0xc0 | cc >> 6, 0x80 | cc & 0x3f);
            })
            .replace(/[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
            function(c) {
                var cc = c.charCodeAt(0);
                return String.fromCharCode(0xe0 | cc >> 12, 0x80 | cc >> 6 & 0x3F, 0x80 | cc & 0x3f);
            });
            return strUtf;
        },

        /**
         * Decode utf-8 encoded string back into multi-byte Unicode characters
         *
         * @param {String} strUtf UTF-8 string to be decoded back to Unicode
         * @returns {String} decoded string
         */
        decode: function(strUtf) {
            // note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
            var strUni = strUtf.replace(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars
            function(c) { // (note parentheses for precence)
                var cc = ((c.charCodeAt(0) & 0x0f) << 12) | ((c.charCodeAt(1) & 0x3f) << 6) | (c.charCodeAt(2) & 0x3f);
                return String.fromCharCode(cc);
            })
            .replace(/[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars
            function(c) { // (note parentheses for precence)
                var cc = (c.charCodeAt(0) & 0x1f) << 6 | c.charCodeAt(1) & 0x3f;
                return String.fromCharCode(cc);
            });
            return strUni;
        }
    };
var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
        a256 = '',
        r64 = [256],
        r256 = [256],i=0;
while(i < 256) {
        var c = String.fromCharCode(i);
        a256 += c;
        r256[i] = i;
        r64[i] = b64.indexOf(c);
        ++i;
    }
function main(plain) {
	    utf8encode="UTF-8";
        plain = code(plain, false, r256, b64, 8, 6);
        return plain + '===='.slice((plain.length % 4) || 4);
    };