text: const mongoose=require('mongoose')
  
  mongoose.connect('mongodb://test:123456@127.0.0.1:27017/testdb',{useNewUrlParser:true,useUnifiedTopology: true})
  
  const User=mongoose.model('users',{name:String,age:Number,email:String})
  
  const user=new User({
    name:'uu',
    age:13,
    email:'uu@qq.com'
  })
  
  user.save().then(res=>{
    console.log(res)
  })