nodejs之base64编码解码问题

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nodejs base64 编码解码

普通字符串

编码

var b = new Buffer('JavaScript'); var s = b.toString('base64'); // SmF2YVNjcmlwdA==

解码：

var b = new Buffer('SmF2YVNjcmlwdA==', 'base64') var s = b.toString(); // JavaScript

编码解码并转成hex

var b = new Buffer('SmF2YVNjcmlwdA==', 'base64') var s = b.toString('hex'); // 4a617661536372697074 var b = new Buffer('4a617661536372697074', 'hex') var s = b.toString('utf8'); // JavaScript

编码解码图片

var fs = require('fs');   // function to encode file data to base64 encoded string function base64_encode(file) {     // read binary data     var bitmap = fs.readFileSync(file);     // convert binary data to base64 encoded string     return new Buffer(bitmap).toString('base64'); }   // function to create file from base64 encoded string function base64_decode(base64str, file) {     // create buffer object from base64 encoded string, it is important to tell the constructor that the string is base64 encoded     var bitmap = new Buffer(base64str, 'base64');     // write buffer to file     fs.writeFileSync(file, bitmap);     console.log('******** File created from base64 encoded string ********'); }   // convert image to base64 encoded string var base64str = base64_encode('kitten.jpg-600'); console.log(base64str); // convert base64 string back to image  base64_decode(base64str, 'copy.jpg-600');

nodejs 操作base64

node 对字符串图片 base64 编码解码。

/* 对普通的字符串 进行base64 */ var b = new Buffer('abceAdf123'); var s = b.toString('base64'); console.log(s); // YWJjZUFkZjEyMw== let str = "7b3a51166a197c983519096085cebc70d2710146a67691937b2bd3efea91c6f6"; let s1 = new Buffer(str).toString('base64'); // N2IzYTUxMTY2YTE5N2M5ODM1MTkwOTYwODVjZWJjNzBkMjcxMDE0NmE2NzY5MTkzN2IyYmQzZWZlYTkxYzZmNg== console.log(s1); /* 解码base64 */ var b = new Buffer('YWJjZUFkZjEyMw==', 'base64') var s2 = b.toString('utf8'); // hex => 转成十六进制 console.log(s2); // abceAdf123 // utf-8 var b = new Buffer('N2IzYTUxMTY2YTE5N2M5ODM1MTkwOTYwODVjZWJjNzBkMjcxMDE0NmE2NzY5MTkzN2IyYmQzZWZlYTkxYzZmNg==', 'base64') var s3 = b.toString('utf8'); console.log(s3); /*对图片的base64*/ var fs = require('fs'); function base64_encode(file) { var bitmap = fs.readFileSync(file); return new Buffer(bitmap).toString('base64'); } function base64_decode(base64str, file) { var bitmap = new Buffer(base64str, 'base64'); fs.writeFileSync(file, bitmap); } var base64str = base64_encode('a.png-600'); console.log(base64str); base64_decode(base64str, 'a.copy.png-600');