DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version

如果在调用数据库的时候出现：DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect. 的正确解决方法如下：

添加 {useNewUrlParser:true}。

  MongoClient.connect(Config.dbUrl,{useNewUrlParser:true},(err,client)=>{

                  if(err){
                      reject(err)

                  }else{

                      _that.dbClient=client.db(Config.dbName);
                      resolve(_that.dbClient)
                  }
              })