MongoDB 服务起来了，终端可以使用 shell 可以查询，

MongoDB 服务起来了，终端可以使用 shell 可以查询，但是 Node 始终连结不上？

Node代码如下

const mongoose = require('mongoose');
const db = mongoose.connect('mongodb://localhost:27017/test');
db.Promise = global.Promise;

db.connection.on('error', function(error) {
    console.log('___db：error');
    console.log(error);
});

db.connection.on('open', function() {
    console.log('___db:open');
});

打印的错误堆栈信息

___db：error
{ MongoError: failed to connect to server [localhost:27017] on first connect [MongoError: getaddrinfo ENOTFOUND localhost localhost:27017]
    at Pool.eventHandler (/Users/liangyabin/Desktop/写一些小demo/node_modules/mongodb-core/lib/topologies/server.js:328:35)
    at emitOne (events.js:96:13)
    at Pool.emit (events.js:191:7)
    at Connection.<anonymous> (/Users/liangyabin/Desktop/写一些小demo/node_modules/mongodb-core/lib/connection/pool.js:274:12)
    at Object.onceWrapper (events.js:293:19)
    at emitTwo (events.js:106:13)
    at Connection.emit (events.js:194:7)
    at Socket.errorHandler (/Users/liangyabin/Desktop/写一些小demo/node_modules/mongodb-core/lib/connection/connection.js:177:49)
    at Object.onceWrapper (events.js:293:19)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:191:7)
    at connectErrorNT (net.js:1034:8)
    

浏览器访问：http://localhost:27017

显示：It looks like you are trying to access MongoDB over HTTP on the native driver port.

哪里出问题了？

说出来大家可能不信

const db = mongoose.connect('mongodb://localhost:27017/test');
改成
const db = mongoose.connect('mongodb://127.0.0.1:27017/test');
这样就不会报错了，我的天啊

最后确定是 hosts 文件的问题