连续两次查询数据库的promise写法

 try{
    //3.检查该邮箱是否注册过
    let finResult = await userModel.findOne({email})
    if(finResult){
      //response.send(`注册失败，${email}邮箱已经被注册了`)
      //return
      errMsg.emailErr = `注册失败，${email}邮箱已经被注册了`
      response.render('register',{errMsg})
    }else{
      await userModel.create({email,nick_name,password})
      console.log(`邮箱为：${email}，昵称为:${nick_name}的用户注册成功了！`)
      //response.send('注册成功了！')
      response.redirect(`/login?email=${email}`)
    }
  }
  catch(err){
    //1.计数 2.引入警报模块
    console.log(err)
    errMsg.networkErr = `阿偶，网络不稳定，稍后重试！`
    //response.send('阿偶，网络不稳定，稍后重试！')
    response.render('register',{errMsg})
  }
})