2021-03-02 nodejs base64 encode

定义方法

const fs = require('fs');

 function base64_encode(file) {
...     let bitmap = fs.readFileSync(file);
...     return new Buffer(bitmap).toString('base64');
... }

base64 encode 编码一个txt文件

bb=base64_encode("D:\\OSlink\\.vscode\\extensions\\ms-azuretools.vscode-apimanagement-1.0.0\\try\\node_modules\\yargs-parser\\LICENSE.txt")

原始file text content:

Copyright (c) 2016, Contributors

Permission to use, copy, modify, and/or distribute this software
for any purpose with or without fee is hereby granted, provided
that the above copyright notice and this permission notice
appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE
LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

编码后的output:

Q29weXJpZ2h0IChjKSAyMDE2LCBDb250cmlidXRvcnMKClBlcm1pc3Npb24gdG8gdXNlLCBjb3B5LCBtb2RpZnksIGFuZC9vciBkaXN0cmlidXRlIHRoaXMgc29mdHdhcmUKZm9yIGFueSBwdXJwb3NlIHdpdGggb3Igd2l0aG91dCBmZWUgaXMgaGVyZWJ5IGdyYW50ZWQsIHByb3ZpZGVkCnRoYXQgdGhlIGFib3ZlIGNvcHlyaWdodCBub3RpY2UgYW5kIHRoaXMgcGVybWlzc2lvbiBub3RpY2UKYXBwZWFyIGluIGFsbCBjb3BpZXMuCgpUSEUgU09GVFdBUkUgSVMgUFJPVklERUQgIkFTIElTIiBBTkQgVEhFIEFVVEhPUiBESVNDTEFJTVMgQUxMIFdBUlJBTlRJRVMKV0lUSCBSRUdBUkQgVE8gVEhJUyBTT0ZUV0FSRSBJTkNMVURJTkcgQUxMIElNUExJRUQgV0FSUkFOVElFUwpPRiBNRVJDSEFOVEFCSUxJVFkgQU5EIEZJVE5FU1MuIElOIE5PIEVWRU5UIFNIQUxMIFRIRSBBVVRIT1IgQkUKTElBQkxFIEZPUiBBTlkgU1BFQ0lBTCwgRElSRUNULCBJTkRJUkVDVCwgT1IgQ09OU0VRVUVOVElBTCBEQU1BR0VTCk9SIEFOWSBEQU1BR0VTIFdIQVRTT0VWRVIgUkVTVUxUSU5HIEZST00gTE9TUyBPRiBVU0UsIERBVEEgT1IgUFJPRklUUywKV0hFVEhFUiBJTiBBTiBBQ1RJT04gT0YgQ09OVFJBQ1QsIE5FR0xJR0VOQ0UgT1IgT1RIRVIgVE9SVElPVVMgQUNUSU9OLApBUklTSU5HIE9VVCBPRiBPUiBJTiBDT05ORUNUSU9OIFdJVEggVEhFIFVTRSBPUiBQRVJGT1JNQU5DRSBPRiBUSElTIFNPRlRXQVJFLgo=