toJson method Null safety
Implementation
Map toJson() {
Map data = Map();
data['userId'] = userId;
data['nickName'] = nickName;
data['avatarUrl'] = avatarUrl;
data['mail'] = mail;
data['phone'] = phone;
data['gender'] = gender;
data['sign'] = sign;
data['birth'] = birth;
data['ext'] = ext;
return data;
}