toChatType function

dynamic toChatType (ChatType type)

聊天类型 ChatType 类型数据转 int

Implementation 

toChatType(ChatType type){
    if(type == ChatType.Chat){
      return 0;
    }else if(type == ChatType.GroupChat){
      return 1;
    }else if(type == ChatType.ChatRoom){
      return 2;
    }
}