1.文章的添加功能

• 创建文章集合

const mongoose = require('mongoose');

const topicSchema = new mongoose.Schema({
    title:{
        type: String,
        maxlength: 20,
        minlength: 4,
        required: [true,'请输入标题']
    },
    author:{
      type:String
    },
    publishDate:{
        type:Date,
        default:Date.now
    },
    content:{
        type:String
    }
});
const topic =  mongoose.model('topic',topicSchema);
module.exports = { topic };

• 添加文章

const { Topic } = require('../../model/topic');
module.exports = async (req,res,next) =>{
    await Topic.create(req.body);
     return next(JSON.stringify({message: 'OK'}));
}

• 处理日期格式

const template = require('art-template');
const dateformat = require('dateformat');
//向模板内导入dateformat变量
tempalte.defaults.imports.dateFormat = dateformat;

使用实例：dateFormat($value.publishDate, 'yyyy-mm-dd')

• 数据分页 mongoose-sex-page
  npm install mongoose-sex-page

const pagination = require('mongoose-sex-page');

• 渲染所有页面

const { Topic } = require('../../model/topic');
module.exports = async (req,res) =>{
    const page = req.query.page;
    let topics = await pagination(Topic).find().page(page).size(10).dispaly(3)
                      .populate('author').exec();
    res.render('/',{
         topics:topics
})
}

• mongodb添加账号
  创建超级管理员
  use admin
db.creatUser({user:'root',pwd:'root',roles:['root']})
  创建普通的管理员
  use blog
db.creatUser({user:'blog',pwd:'blog',roles:['readWrite']})
  停止服务 net stop MongoDB
  卸载服务 MongoDB --remove
  重新配置服务 mongod --dbpath "C:\mongodb\db" --logpath "C:\mongodb\log.txt" --install --serviceName "MongoDB --auth
• 修改数据库连接

mongoose.connect('mongodb://blog:blog@localhost:27017/blog')
  .then(() => console.log('数据库连接成功'))
  .catch(() => console.log('数据库连接失败'));

• 获取当前系统是否是生产环境
  npm install morgan

const morgan = require('morgan');
if (process.env.NODE_ENV ==='development'){
  app.use(morgan('dev'));
}else{
}

• 配置config
  npm install config
  创建config文件夹，下面创建default.js、development.js、production.js

const config = require('config');
config.get('db.user');

• config 保存敏感信息
  创建custom-environment-variables.json 文件,示例如下

{
  {
    "db":{
      "pwd" : "APP_PWD"
    }
  }
}

将pwd的值保存到环境变量APP_PWD即可