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Asynchronous programming is a problem that every JavaScript programmer will encounter, whether it's a front-end ajax request or a node's various asynchronous API s. This article will summarize four common methods to deal with asynchronous programming. callback The use of callback functions is the most common form. Here are a few examples: // jQ ...

We then went on to the previous project. The first part mainly talked about the skills we need to master at the front end, and quickly built the project through vue.js and element-ui. But as I said before, I don't like using third-party things very much. So I don't need bootstrap, nor jquery, nor any tripartite components. I only use Vue family ...

One: Introduction of jQuery jQuery is essentially a js class library that encapsulates commonly used methods and objects for our convenience. 1. Our previous DOM programming: var obj = Document.getElementById(id); what object is obj obtained here - the DOM object 2. If we want to use some of the methods and attributes already encapsulated i ...

When writing a registration, I want to use the mobile phone number to verify, to ensure the user's safe operation, because the previous use of email verification is too troublesome. So we found a better third party on the Internet to provide short message service. Try it, the speed is good, basically three seconds or so can receive short ...

DOM(document object model): Document object model, Provides a way to get the elements in the page: document.getElementById(); Context. getElements ByTagName (TAGNAME)// Get all tags named TAGNAME for the neutron grandchildren of the specified container Context. getElements ByClassName (CLASSNAME) // Incompatible under ie6-8 document.getElements ...

Implementation of Dropdown Menu with HTML and CSS The code for the html section is as follows: <div id="nav"> <ul> <li ><a href="#">home page</a></li> <li><a href="#">Learning Center</a> <ul> <li><a href="#">JavaScript&l ...

Event module is one of Zepto's essential modules. Event object is complex because of its unfamiliar with Event Api. So at first glance, the source code of Event module is a bit confusing. Looking at it carefully, it's actually not too complicated. Read the Zepto source series on github. Welcome star: reading-zepto Source version The source code ...

As programmers, we often use the upload and download functions of files. When it's time to use it, check all kinds of information. There's wood. There's wood. In order to facilitate the next use, here is a summary and a memorandum. Using Form to Upload Files The most primitive, simple and rude file upload. Front-end code: //Mode 1 <form acti ...

Previous remarks Why do we introduce pug? What's so special about pug? There are some deeper nested pages that may appear nested, as shown in the following figure In later maintenance and modification, carelessly missing an angle bracket, or the beginning and closing of a label does not correspond, will lead to the DOM structure confusion o ...

Create a project Create an empty Web project, and add SignalR, jQuery UI package to Nuget, and include jQuery, jQuery.UI, and ignalR scripts in the future project.   Creating Basic Applications Add a SignalR Hub class and name it MoveShapeHub to update the code. using Microsoft.AspNet.SignalR; using Newtonsoft.Json; namespace Sig ...