node.js 连接MongoDB

①安装

cnpm  install  mongodb

②增删改查

let MongoClient = require('mongodb').MongoClient
let url = 'mongodb://localhost:27017/test'

let insertData = (db, callback) => {
    let collection = db.collection('site')
    //插入数据
    // let data = [
    //     {"name": 'jan', age: 24, job: 'fontend'}
    // ]
    // collection.insert(data, (err, result) => {
    //     if (err) {
    //         return
    //     }
    //     callback(result)
    // })

    //查询数据
    let str={"name":'jan'}
    collection.find(str).toArray((err,result)=>{
        callback(result)
    })
    //更新数据
    let strB = {"name":'jan'}
    let strE = {$set:{"name":'CCC',age:25}}
    collection.update(strB,strE,(err,result)=>{
        callback(result)
    })
    //删除数据
    let strD = {"name":'CCC'}
    collection.remove(strD,(err,result)=>{
        callback(result)
    })
}
MongoClient.connect(url, (err, db) => {
    insertData(db, (reslut) => {
        console.log(reslut)
        db.close()
    })
})

mongoose 使用

cnpm install mongoose

如果出现

DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html

mongoose.Promise = global.Promise; //连接前加上这句话
参考：https://www.cnblogs.com/zhongweiv/p/mongoose.html

项目中如何使用html模板

/* GET home page. */
router.get('/', function(req, res, next) {
  // res.render('index', { title: 'Express' });
    res.sendfile('./views/home.html')
});

jade中引入 bootstrap

doctype html
html
    head
        block scripts
            link(rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css")
            script(src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js")
            script(src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js")
    body
        h1 jade demo
        button.btn.btn-primary.btn-lg learn more