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Course Introduction：Writing good unit tests and integration tests is the key to ensuring the quality of Python projects. Unit testing starts from small things to verify whether the function behavior meets expectations. It is recommended that each function covers normal, boundary and exceptional situations, and use mock to isolate external dependencies; integration testing starts from the overall perspective to verify whether the collaboration between modules is smooth, and test clients and test data are commonly used to simulate real processes; test coverage should not blindly pursue high scores, but should pay attention to core logic and avoid formalism. Mastering these key points can effectively improve code stability and maintainability.

2025-07-05 comment 0  543

Course Introduction：Closures are the mechanism in JavaScript for functions to remember their lexical scope, even if the scope has been executed. 1. Closures allow functions to access and remember external variables; 2. Commonly used in data encapsulation, function factories and asynchronous operations; 3. Examples include creating counters with private state; 4. Pay attention to traps in loops and asynchronous code when using them, such as using let or IIFE to solve closure capture problems. In short, closures are a combination of functions and their lexical environments, and are a key tool for building modules and maintaining states.

2025-07-08 comment 0  724

Course Introduction：To correctly use dispatchaction in Redux, you need to pay attention to the following points: 1. Select the correct dispatch method according to the usage scenario. UseDispatch() is commonly used in the component, and store calls store.dispatch() in a separate file; 2. The action must be an object containing the type field or generated by the actioncreator. If you use ReduxToolkit, you should call the generated actioncreator first; 3. Asynchronous operations require the introduction of middleware such as ReduxThunk or Saga, otherwise the dispatch function cannot be dispatched; 4. The type naming of action is recommended to adopt

2025-07-03 comment 0  192

Course Introduction：The function of OpenGraphmeta tag is to make web pages more beautiful and professional when sharing on social platforms. It defines attractive titles through og:title, such as changing the original title to a more attractive copy; og:image specifies the image displayed during sharing, and the recommended size is 1200x630 pixels and uses an absolute path; other commonly used tags include og:type specifying the page type, og:url declaration URL, og:description supplementary description, og:site_name displaying the website name. These tags need to be added to the web page to improve sharing performance.

2025-07-09 comment 0  589

Course Introduction：The steps to deploy a PHP environment to a cloud server include: 1. Select the appropriate cloud service provider and server configuration; 2. Install PHP and commonly used extensions; 3. Configure the web server and site directory; 4. Set up the database and test the connection. First, you should choose a service provider with one-click mirror installation function. It is recommended to configure it at least 1 core 2G memory and 20GB system disk; secondly, use apt on Ubuntu to install PHP and necessary extensions, and verify whether the installation is successful; then put the project into the default website root directory and set permissions, or configure the virtual host as needed; finally install MySQL or MariaDB, create a database and user, and test whether the environment is running normally through the phpinfo() page. Pay attention to permissions and service retention in the whole process.

2025-06-27 comment 0  1019

Course Elementary  13744

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82257

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13130

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24578

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27436

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.