将一个数据结构转填充另一个数据结构.

过来结构体空字段，转换json字段的map.

------------------- Decode 用gob进行数据解码 .

------------------- Decode 用json进行数据解码 .

-------------------- Encode 用gob进行数据编码 .

用json进行数据编码 .

GbkToUtf8 transforms GBK to UTF8.

GbkToUtf8Str transforms GBK to UTF8 string.

如果有相同的key,会被覆盖.

parse params(name=nick&pass=123).

ToIndentJSON converts the golang value to indent JSON string, such as a struct, map, slice, array etc.

Utf8ToGbk transforms utf8 to gbk.

Utf8ToGbkStr transforms utf8 to gbk string.