var str = 'abc';
var a = new Buffer(6);
a.fill(str);
console.log(a.toString());

• 在 3.2.0-67-generic #101-Ubuntu SMP Tue Jul 15 17:46:11 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux 结果为 aaaaaa

• 在 mac osx上为 abcabc

var a = {
    b: new Buffer('aadf')
}
console.log(JSON.stringify(a))

• 在 3.2.0-67-generic #101-Ubuntu SMP Tue Jul 15 17:46:11 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux 结果为 {"b":[97,97,100,102]}

• 在 mac osx上为 {"b":{"type":"Buffer","data":[97,102]}}