uni-app在VUE3下, 如何使用base64.js?

uni-app在VUE3下, 如何使用base64.js?

在VUE2下面, 可以使用以下 base64.js (标准档)

使用方法:

(先申明一下Base64 )

const Base64 = require('./base64.js').Base64; //这里这样引用一下, 其它单元就直接用Base64.encode

然后就可以用了:

console.log(Base64.encode('xxxx'));
console.log(Base64.decode('eHh4eA=='));

但是,在VUE3下, 上述方法行不通. 会报错.

请问一下, 我该如何书写?

/*
 *  base64.js
 *
 *  Licensed under the BSD 3-Clause License.
 *    http://opensource.org/licenses/BSD-3-Clause
 *
 *  References:
 *    http://en.wikipedia.org/wiki/Base64
 */
;
(function(global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ?
    module.exports = factory(global) :
    typeof define === 'function' && define.amd ?
    define(factory) : factory(global)
}((typeof self !== 'undefined' ? self :
  typeof window !== 'undefined' ? window :
  typeof global !== 'undefined' ? global :
  this),
function(global) {
  'use strict';
  // existing version for noConflict()
  global = global || {};
  var _Base64 = global.Base64;
  var version = "2.5.1";
  // if node.js and NOT React Native, we use Buffer
  var buffer;
  if (typeof module !== 'undefined' && module.exports) {
    try {
      buffer = eval("require('buffer').Buffer");
    } catch (err) {
      buffer = undefined;
    }
  }
  // constants
  var b64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  var b64tab = function(bin) {
    var t = {};
    for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
    return t;
  }(b64chars);
  var fromCharCode = String.fromCharCode;
  // encoder stuff
  var cb_utob = function(c) {
    if (c.length < 2) {
      var cc = c.charCodeAt(0);
      return cc < 0x80 ? c :
        cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6)) +
          fromCharCode(0x80 | (cc & 0x3f))) :
        (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f)) +
          fromCharCode(0x80 | ((cc >>> 6) & 0x3f)) +
          fromCharCode(0x80 | (cc & 0x3f)));
    } else {
      var cc = 0x10000 +
        (c.charCodeAt(0) - 0xD800) * 0x400 +
        (c.charCodeAt(1) - 0xDC00);
      return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07)) +
        fromCharCode(0x80 | ((cc >>> 12) & 0x3f)) +
        fromCharCode(0x80 | ((cc >>> 6) & 0x3f)) +
        fromCharCode(0x80 | (cc & 0x3f)));
    }
  };
  var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
  var utob = function(u) {
    return u.replace(re_utob, cb_utob);
  };
  var cb_encode = function(ccc) {
    var padlen = [0, 2, 1][ccc.length % 3],
      ord = ccc.charCodeAt(0) << 16 |
      ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8) |
      ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
      chars = [
        b64chars.charAt(ord >>> 18),
        b64chars.charAt((ord >>> 12) & 63),
        padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
        padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
      ];
    return chars.join('');
  };

  var btoa = global.btoa ? function(b) {
    return global.btoa(b);
  } : function(b) {
    return b.replace(/[\s\S]{1,3}/g, cb_encode);
  };
  var _encode = buffer ?
    buffer.from && Uint8Array && buffer.from !== Uint8Array.from ?
    function(u) {
      return (u.constructor === buffer.constructor ? u : buffer.from(u))
        .toString('base64')
    } :
    function(u) {
      return (u.constructor === buffer.constructor ? u : new buffer(u))
        .toString('base64')
    } :
    function(u) {
      return btoa(utob(u))
    };
  var encode = function(u, urisafe) {
    return !urisafe ?
      _encode(String(u)) :
      _encode(String(u)).replace(/[+\/]/g, function(m0) {
        return m0 == '+' ? '-' : '_';
      }).replace(/=/g, '');
  };
  var encodeURI = function(u) {
    return encode(u, true)
  };
  // decoder stuff
  var re_btou = new RegExp([
    '[\xC0-\xDF][\x80-\xBF]',
    '[\xE0-\xEF][\x80-\xBF]{2}',
    '[\xF0-\xF7][\x80-\xBF]{3}'
  ].join('|'), 'g');
  var cb_btou = function(cccc) {
    switch (cccc.length) {
      case 4:
        var cp = ((0x07 & cccc.charCodeAt(0)) << 18) |
          ((0x3f & cccc.charCodeAt(1)) << 12) |
          ((0x3f & cccc.charCodeAt(2)) << 6) |
          (0x3f & cccc.charCodeAt(3)),
          offset = cp - 0x10000;
        return (fromCharCode((offset >>> 10) + 0xD800) +
          fromCharCode((offset & 0x3FF) + 0xDC00));
      case 3:
        return fromCharCode(
          ((0x0f & cccc.charCodeAt(0)) << 12) |
          ((0x3f & cccc.charCodeAt(1)) << 6) |
          (0x3f & cccc.charCodeAt(2))
        );
      default:
        return fromCharCode(
          ((0x1f & cccc.charCodeAt(0)) << 6) |
          (0x3f & cccc.charCodeAt(1))
        );
    }
  };
  var btou = function(b) {
    return b.replace(re_btou, cb_btou);
  };
  var cb_decode = function(cccc) {
    var len = cccc.length,
      padlen = len % 4,
      n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 :
        0) |
      (len > 1 ? b64tab[cccc.charAt(1)] << 12 :
        0) |
      (len > 2 ? b64tab[cccc.charAt(2)] << 6 :
        0) |
      (len > 3 ? b64tab[cccc.charAt(3)] : 0),
      chars = [
        fromCharCode(n >>> 16),
        fromCharCode((n >>> 8) & 0xff),
        fromCharCode(n & 0xff)
      ];
    chars.length -= [0, 0, 2, 1][padlen];
    return chars.join('');
  };
  var _atob = global.atob ? function(a) {
    return global.atob(a);
  } : function(a) {
    return a.replace(/\S{1,4}/g, cb_decode);
  };
  var atob = function(a) {
    return _atob(String(a).replace(/[^A-Za-z0-9\+\/]/g, ''));
  };
  var _decode = buffer ?
    buffer.from && Uint8Array && buffer.from !== Uint8Array.from ?
    function(a) {
      return (a.constructor === buffer.constructor ?
        a : buffer.from(a, 'base64')).toString();
    } :
    function(a) {
      return (a.constructor === buffer.constructor ?
        a : new buffer(a, 'base64')).toString();
    } :
    function(a) {
      return btou(_atob(a))
    };
  var decode = function(a) {
    return _decode(
      String(a).replace(/[-_]/g, function(m0) {
        return m0 == '-' ? '+' : '/'
      })
      .replace(/[^A-Za-z0-9\+\/]/g, '')
    );
  };
  var noConflict = function() {
    var Base64 = global.Base64;
    global.Base64 = _Base64;
    return Base64;
  };
  // export Base64
  global.Base64 = {
    VERSION: version,
    atob: atob,
    btoa: btoa,
    fromBase64: decode,
    toBase64: encode,
    utob: utob,
    encode: encode,
    encodeURI: encodeURI,
    btou: btou,
    decode: decode,
    noConflict: noConflict,
    __buffer__: buffer
  };
  // if ES5 is available, make Base64.extendString() available
  if (typeof Object.defineProperty === 'function') {
    var noEnum = function(v) {
      return {
        value: v,
        enumerable: false,
        writable: true,
        configurable: true
      };
    };
    global.Base64.extendString = function() {
      Object.defineProperty(
        String.prototype, 'fromBase64', noEnum(function() {
          return decode(this)
        }));
      Object.defineProperty(
        String.prototype, 'toBase64', noEnum(function(urisafe) {
          return encode(this, urisafe)
        }));
      Object.defineProperty(
        String.prototype, 'toBase64URI', noEnum(function() {
          return encode(this, true)
        }));
    };
  }
  //
  // export Base64 to the namespace
  //
  if (global['Meteor']) { // Meteor.js
    Base64 = global.Base64;
  }
  // module.exports and AMD are mutually exclusive.
  // module.exports has precedence.
  if (typeof module !== 'undefined' && module.exports) {
    module.exports.Base64 = global.Base64;
  } else if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module.
    define([], function() {
      return global.Base64
    });
  }
  // that's it!
  return {
    Base64: global.Base64
  }
}));