微信小程序中使用Base64编码解码

创建js-base64.js文件

(function(global) {'use strict';var global = global || {};var _Base64 = global.Base64;var version = "1.0.0";var buffer;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 stuffvar 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 ? 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 stuffvar 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\S]{1,4}/g, cb_decode);};var _decode = buffer ? 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 Base64global.Base64 = {VERSION: version,atob: atob,btoa: btoa,fromBase64: decode,toBase64: encode,utob: utob,encode: encode,encodeURI: encodeURI,btou: btou,decode: decode,noConflict: noConflict};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)}));};}Ïmodule.exports = global.Base64;
})(this);

创建 base64.modified.js

(function(global) {'use strict';var global = global || {};var _Base64 = global.Base64;var version = "1.0.0";var buffer;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;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 ? 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) };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\S]{1,4}/g, cb_decode);};var _decode = buffer ? 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;};global.Base64 = {VERSION: version,atob: atob,btoa: btoa,fromBase64: decode,toBase64: encode,utob: utob,encode: encode,encodeURI: encodeURI,btou: btou,decode: decode,noConflict: noConflict};// if ES5 is available, make Base64.extendString() availableif (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)}));};}module.exports = global.Base64;
})(this);

使用方法

var Base64 = require('../../../../utils/base64.modified.js');
console.log(Base64.encode('微信小程序'));
console.log(Base64.decode('5b6u5L+h5bCP56iL5bqP'));

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