关于express 连接 mongodb数据库报错

nodejs 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.

const mongoose = require('mongoose')

mongoose.connect("mongodb://localhost:27017/study", {useNewUrlParser:true}, function(err){

　　if(err){

　　　　console.log('Connection Error:' + err)

　　}else{

　　　　console.log('Connection success!')

　　}

})