JSON.stringify中的Unicode字符转换为真正的Unicode字符

看到输出UTF-16？有点卡住

这将转换为UTF-8：

function unescape_utf16($string) {        $string = preg_replace_callback(        '/\\u(D[89ab][0-9a-f]{2})\\u(D[c-f][0-9a-f]{2})/i',        function ($matches) { $d = pack("H*", $matches[1].$matches[2]); return mb_convert_encoding($d, "UTF-8", "UTF-16BE");        }, $string);        $string = preg_replace_callback('/\\u([0-9a-f]{4})/i',        function ($matches) { $d = pack("H*", $matches[1]); return mb_convert_encoding($d, "UTF-8", "UTF-16BE");        }, $string);    return $string;}