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  • 微信小程序-Base64 加解密

    js:

    var Base64 = {
      _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
      encode (str) { // 加密
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        str = this._utf16to8(str);
        while (i < str.length) {
          chr1 = str.charCodeAt(i++);
          chr2 = str.charCodeAt(i++);
          chr3 = str.charCodeAt(i++);
          enc1 = chr1 >> 2;
          enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
          enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
          enc4 = chr3 & 63;
          if (isNaN(chr2)) {
            enc3 = enc4 = 64;
          } else if (isNaN(chr3)) {
            enc4 = 64;
          }
          output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
        } return output;
      },
      decode (input) { // 解密
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/[^A-Za-z0-9+/=]/g, "");
        while (i < input.length) {
            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        } return this._utf8to16(output);
      },
      _utf16to8: function(str) {
        var out, i, len, c;
        out = "";
        len = str.length;
        for(i = 0; i < len; i++) {
            c = str.charCodeAt(i);
            if ((c >= 0x0001) && (c <= 0x007F)) {
                out += str.charAt(i);
            } else if (c > 0x07FF) {
                out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
                out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
                out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
            } else {
                out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
                out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
            }
        }
        return out;
      },
      _utf8to16 (str) { 
        var out, i, len, c;
        var char2, char3;
        out = "";
        len = str.length;
        i = 0;
        while(i < len) {
            c = str.charCodeAt(i++);
            switch(c >> 4)
            {
                case 0: case 1: case 2: case 3: case 4: case 5: case 6:case7:
                  out += str.charAt(i-1);
                break;
                case 12: case 13:
                  char2 = str.charCodeAt(i++);
                  out += String.fromCharCode(((c & 0x1F) << 6) | (char2&0x3F));
                break;
                case 14:
                  char2 = str.charCodeAt(i++);
                  char3 = str.charCodeAt(i++);
                  out += String.fromCharCode(((c & 0x0F) << 12) |
                    ((char2 & 0x3F) << 6) |
                    ((char3 & 0x3F) << 0));
                break;
            }
        } return out;
      }
    }
    
    /* 暴露函数 */
    module.exports = Base64

    xxpage.js

    /* 引入 */
    var base64  = require('xxx/xxx/base64');
    
    /* 使用 */
    console.log('注册成功123abc!@#','base64加密后:',base64.encode('注册成功123abc!@#'))
    console.log(base64.encode('注册成功123abc!@#'),'base64解密后:',base64.decode(base64.encode('注册成功123abc!@#')))

    运行结果

    注册成功123abc!@# base64加密后: 5rOo5YaM5oiQ5YqfMTIzYWJjIUAj
    5rOo5YaM5oiQ5YqfMTIzYWJjIUAj base64解密后: 注册成功123abc!@#
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  • 原文地址:https://www.cnblogs.com/eRrsr/p/12297953.html
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