a2u 解码 API编码 API 介绍
由于在NodeJs平台上的缺乏对GBK编码的处理，对于国人来说比较郁闷，故而出现了a2u、iconv-lite等这样的GBK编码处理的模块。
a2u 固然没有 iconv-lite 强大，不过如果你仅需要处理 GB K编码的话，a2u是比iconv-lite更佳的选择，只因为其速度更快、性能更好。
解码 API
var fs = require('fs');
var buf = fs.readFileSync('demo.txt'); //txt's encoding is ANSI, the content is "I(我) love(爱) you(你)."
var a2u = require('a2u');
var str, newBuf;
// Convert from an encoded buffer to js string.
str = a2u.decode(buf);
console.log(str);//I(我) love(爱) you(你).
// If you want convert to buffer with ucs2 encoding, the second arg for method(decode) will be true.
newBuf = a2u.decode(buf, true);
console.log('ANSI buffer : ', buf);
console.log('ucs2 buffer : ', newBuf);
console.log(newBuf.toString('ucs2'));//I(我) love(爱) you(你).
编码 API
var fs = require('fs');
var a2u = require('a2u');
var str = "I(我) love(爱) you(你).";
var buf;
// If string
buf = a2u.encode(str);
console.log('ANSI buffer : ', buf);
// If buffer
buf = a2u.encode( new Buffer(str, 'ucs2') );
console.log('ANSI buffer : ', buf);
// Write to file
fs.writeFileSync('ansi.txt', buf);