url中解析字段并用base64加密解密图片地址

叁歲伎倆 2022-02-01 10:23 102阅读 0赞

//对 123321 进行加密
    var str = $.base64.encode('123321');
    alert(str);
    			
    //对 str 进行解密
    var dstr = $.base64.decode(str);

base64.js 源码

/*!
     * jquery.base64.js 0.1 - https://github.com/yckart/jquery.base64.js
     * Makes Base64 en & -decoding simpler as it is.
     *
     * Based upon: https://gist.github.com/Yaffle/1284012
     *
     * Copyright (c) 2012 Yannick Albert (http://yckart.com)
     * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php).
     * 2013/02/10
     **/
    ;(function($) {
     
        var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
            a256 = '',
            r64 = [256],
            r256 = [256],
            i = 0;
     
        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;
            }
        };
     
        while(i < 256) {
            var c = String.fromCharCode(i);
            a256 += c;
            r256[i] = i;
            r64[i] = b64.indexOf(c);
            ++i;
        }
     
        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 Plugin = $.base64 = function(dir, input, encode) {
                return input ? Plugin[dir](input, encode) : dir ? null : this;
            };
     
        Plugin.btoa = Plugin.encode = function(plain, utf8encode) {
            plain = Plugin.raw === false || Plugin.utf8encode || utf8encode ? UTF8.encode(plain) : plain;
            plain = code(plain, false, r256, b64, 8, 6);
            return plain + '===='.slice((plain.length % 4) || 4);
        };
     
        Plugin.atob = Plugin.decode = function(coded, utf8decode) {
            coded = String(coded).split('=');
            var i = coded.length;
            do {--i;
                coded[i] = code(coded[i], true, r64, a256, 6, 8);
            } while (i > 0);
            coded = coded.join('');
            return Plugin.raw === false || Plugin.utf8decode || utf8decode ? UTF8.decode(coded) : coded;
        };
    }(jQuery));