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为加深对nodeJS服务端与客户端交互的理解，特写下这个案例，供以后查阅。1. 编写mongoose连接模块（connect.js）const mongoose = require('mongoose');function mongoConnect(openFn, errorFn) { //连接数据库 mongoose.connect('mongodb://localhost:27017/demo', { useNewUrlParser: true, .