javascript java 开发语言 js实现base64编码解码

1. 新建Base64.js

export const Base64 = {

keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',

encode(input) {

let output = '';

let chr1, chr2, chr3, enc1, enc2, enc3, enc4;

let i = 0;

input = Base64.utf8Encode(input);

while (i < input.length) {

chr1 = input.charCodeAt(i++);

chr2 = input.charCodeAt(i++);

chr3 = input.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 +

Base64.keyStr.charAt(enc1) + Base64.keyStr.charAt(enc2) +

Base64.keyStr.charAt(enc3) + Base64.keyStr.charAt(enc4);

}

return output;

},

decode(input) {

let output = '';

let chr1, chr2, chr3;

let enc1, enc2, enc3, enc4;

let i = 0;

input = input.replace(/[^A-Za-z0-9+/=]/g, '');

while (i < input.length) {

enc1 = Base64.keyStr.indexOf(input.charAt(i++));

enc2 = Base64.keyStr.indexOf(input.charAt(i++));

enc3 = Base64.keyStr.indexOf(input.charAt(i++));

enc4 = Base64.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);

}

}

output = Base64.utf8Decode(output);

return output;

},

utf8Encode(string) {

string = string.replace(/\r\n/g, '\n');

let utfString = '';

for (let i = 0; i < string.length; i++) {

let c = string.charCodeAt(i);

if (c < 128) {

utfString += String.fromCharCode(c);

} else if ((c > 127) && (c < 2048)) {

utfString += String.fromCharCode((c >> 6) | 192);

utfString += String.fromCharCode((c & 63) | 128);

} else {

utfString += String.fromCharCode((c >> 12) | 224);

utfString += String.fromCharCode(((c >> 6) & 63) | 128);

utfString += String.fromCharCode((c & 63) | 128);

}

}

return utfString;

},

utf8Decode(utfString) {

let string = '';

let i = 0;

let c = 0;

let c2 = 0;

let c3 = 0;

while (i < utfString.length) {

c = utfString.charCodeAt(i);

if (c < 128) {

string += String.fromCharCode(c);

i++;

} else if ((c > 191) && (c < 224)) {

c2 = utfString.charCodeAt(i + 1);

string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));

i += 2;

} else {

c2 = utfString.charCodeAt(i + 1);

c3 = utfString.charCodeAt(i + 2);

string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));

i += 3;

}

}

return string;

}

};

2. 使用

import {Base64} from './Base64.js';

Base64.encode(Value) //编码

Base64.decode(Value) //解码

（vue：

npm install --save js-base64

let Base64 = require('js-base64').Base64

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