Node.js 读缓存

buf = new Buffer(26);

for (var i = 0 ; i < 26 ; i++) {

  buf[i] = i + 97;

}



console.log( buf.toString('ascii'));       // outputs: abcdefghijklmnopqrstuvwxyz

console.log( buf.toString('ascii',0,5));   // outputs: abcde

console.log( buf.toString('utf8',0,5));    // outputs: abcde

console.log( buf.toString(undefined,0,5)); // encoding defaults to 'utf8', outputs abcde