Flutter string 和json之间的相互转换

举例说明：要传的数据为

var date = {
  "name":"lisi",
  "sex":"nan",
  "address":"henan"
};

import 'dart:convert' as convert;

//转string

String str = convert.jsonEncode(date);

//转json

Map<String, dynamic> date =convert.jsonDecode(str );