node.js学习之base64编码解码

三、node.js普通字符串编码解码:

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

四、node.js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');
console.log(base64str);
// convert base64 string back to image
base64_decode(base64str, 'copy.jpg');

总结

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