$res['message']=urlencode($message);
echo urldecode(json_encode($res));
php返回json时,json_encode会输出unicode
参考:http://www.cnblogs.com/ninemilli/archive/2011/09/13/2174560.html
解决
如果php的workspace本身为utf8,
加:$message = iconv("UTF-8//IGNORE","GB2312",$message);