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Course Introduction：Positioning elements with XPath is the core method of Selenium web page automation. The answer is to find elements accurately through find_element(By.XPATH,"xpath expression"). ①The basic syntax requires importing the By class and using WebDriverWait to wait for the element to load; ② Common positioning methods include based on name attributes //input[@name='username'], id//*[@id='login-form'], class//div[@class='alert-error'], and including class//button[contains(@clas

2025-07-30 comment 0  645

Course Introduction：Use SpringSecurity and JWT to implement secure authentication and authorization of RESTAPI in Java, suitable for stateless and scalable architectures such as microservices, mobile applications and single-page applications; 2. First add SpringBootWeb, SpringSecurity and JJW dependencies in pom.xml; 3. Create User and LoginRequest model classes for user information and login requests; 4. Write JwtUtil tool class to generate, parse and verify JWT, note that the key should be configured through environment variables rather than hard coded; 5. Config the SecurityConfig class to disable CSRF, set stateless session policies, release the authentication interface and register JW

2025-07-29 comment 0  492

Course Introduction：Install XAMPP/MAMP or use PHP built-in server and make sure the file is saved as a .php extension; 2. Use display the current time in hello.php; 3. Get user input through $_GET in greet.php and use htmlspecialchars() to prevent XSS; 4. Use include'header.php'; multiplex the page header; 5. Enable error reports during development, variables start with $, use arrays to store data, and always filter user input. You have created a dynamic web page that can respond to user input, display dynamic content and reuse code. This is a key step towards a complete web application. You can connect to the database or build a login system in the future, but you should be sure of yourself at this time.

2025-07-29 comment 0  788

Course Introduction：PHP dynamically generates HTML content by running scripts on the server side, making the website interactive and real-time. 1. It obtains data from the database according to user requests and dynamically splices web page content, realizing that a set of code supports a large number of pages; 2. PHP often cooperates with MySQL to handle functions such as login verification, comment system, etc. that require data storage and query; 3. Use template engines (such as Smarty or Blade) or view separation technology to separate logic from presentation, improving code maintainability; 4. Combine cache mechanisms such as OPcache and Memcached to optimize performance, reduce duplicate parsing and database pressure, thereby efficiently supporting dynamic website operation.

2025-07-18 comment 0  506

Course Introduction：Using Yii's assetbundles is a best practice for managing CSS and JS files. It defines resource groups centrally through PHP classes, and automatically handles dependencies, merging and caches. 1. The resource package is a PHP class used to organize CSS, JS and other resources and declare their dependencies; 2. Register resource packages in the view or layout to automatically generate HTML tags; 3. Different resource packages can be conditionally registered according to user role or page type; 4. The resource files are placed in web/css and web/js by default, and the path can be customized; 5. Use the assetManager configuration to add timestamps to achieve version control, solving browser caching problems. Correct use of resource packages can improve project structure clarity and loading efficiency

2025-07-08 comment 0  766

Course Elementary  13824

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  82359

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  13178

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  24628

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  27486

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.