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