Some notes on CRUD application – Node.js, Express.js & MongoDB

CRUD – READ In Express, we handle a GET request with the get method: app.get(endpoint, callback) endpoint is the requested endpoint. It’s the value that comes after your domain name. Here are some examples: When you visit localhost:3000, you’re actually visiting localhost:3000/. In this case, browsers requested for /. You’re reading this article on https://zellwk.com/blog/crud-express-mongodb/. …

What is call-back function

What is call back function: Simply put: A callback is a function that is to be executed after another function has finished executing — hence the name ‘call back’. More complexly put: In JavaScript, functions are objects. Because of this, functions can take functions as arguments, and can be returned by other functions. Functions that …

What does “let that = this” mean in Javascript/Typescript?

For example, let person = { name:"bill", speak:function(){ console.log("hi i am "+this.name) } } Functions has something called a context. A context is the object the function is being called on. if you were to do person.speak(), it will be called on the object that was defined. The variable person is the context. So when …

What is AJAX

What is AJAX AJAX is not a programming language. AJAX is a technique for accessing web servers from a web page. AJAX stands for Asynchronous JavaScript And XML. Here is an example of AJAX: How AJAX works

How to build navigator of video website in Wechat mini program

Here are some bilibili interface: 首页导航:http://mock-api.com/mnEe4VnJ.mock/navList 轮播图:http://mock-api.com/mnEe4VnJ.mock/swiperList 视频列表:http://mock-api.com/mnEe4VnJ.mock/videoList 视频详情:http://mock-api.com/mnEe4VnJ.mock/videoDetail 推荐视频:http://mock-api.com/mnEe4VnJ.mock/otherList 评论列表:http://mock-api.com/mnEe4VnJ.mock/commentList We can use postman to test the first one (navList): And good job this interface works. Then we should use code in index.js: data: { // 首页导航数据 navList:[] }, If the url we use is not allowed, we need to check this from setting …