React itself does not directly manage focus or accessibility, but provides tools to effectively deal with these issues. 1. Use Refs to programmatically manage focus, such as setting element focus through useRef; 2. Use ARIA attributes to improve accessibility, such as defining the structure and state of tab components; 3. Pay attention to keyboard navigation to ensure that the focus logic in components such as modal boxes is clear; 4. Try to use native HTML elements to reduce the workload and error risk of custom implementation; 5. React assists accessibility by controlling the DOM and adding ARIA attributes, but the correct use still depends on developers.

Shallowrenderingtestsacomponentinisolation,withoutchildren,whilefullrenderingincludesallchildcomponents.Shallowrenderingisgoodfortestingacomponent’sownlogicandmarkup,offeringfasterexecutionandisolationfromchildbehavior,butlacksfulllifecycleandDOMinte

StrictMode does not render any visual content in React, but it is very useful during development. Its main function is to help developers identify potential problems, especially those that may cause bugs or unexpected behavior in complex applications. Specifically, it flags unsafe lifecycle methods, recognizes side effects in render functions, and warns about the use of old string refAPI. In addition, it can expose these side effects by intentionally repeating calls to certain functions, thereby prompting developers to move related operations to appropriate locations, such as the useEffect hook. At the same time, it encourages the use of newer ref methods such as useRef or callback ref instead of string ref. To use Stri effectively

Create TypeScript-enabled projects using VueCLI or Vite, which can be quickly initialized through interactive selection features or using templates. Use tags in components to implement type inference with defineComponent, and it is recommended to explicitly declare props and emits types, and use interface or type to define complex structures. It is recommended to explicitly label types when using ref and reactive in setup functions to improve code maintainability and collaboration efficiency.

There are three key points to be mastered when processing Vue forms: 1. Use v-model to achieve two-way binding and synchronize form data; 2. Implement verification logic to ensure input compliance; 3. Control the submission behavior and process requests and status feedback. In Vue, form elements such as input boxes, check boxes, etc. can be bound to data attributes through v-model, such as automatically synchronizing user input; for multiple selection scenarios of check boxes, the binding field should be initialized into an array to correctly store multiple selected values. Form verification can be implemented through custom functions or third-party libraries. Common practices include checking whether the field is empty, using a regular verification format, and displaying prompt information when errors are wrong; for example, writing a validateForm method to return the error message object of each field. You should use it when submitting

Server-siderendering(SSR)inNext.jsgeneratesHTMLontheserverforeachrequest,improvingperformanceandSEO.1.SSRisidealfordynamiccontentthatchangesfrequently,suchasuserdashboards.2.ItusesgetServerSidePropstofetchdataperrequestandpassittothecomponent.3.UseSS

Content Security Policy (CSP) prevents attacks such as XSS by limiting the loading source of web page resources. Its core mechanism is to set a whitelist to prevent unauthorized scripts from being executed. The steps to enable include: 1. Define the policy and clarify the allowed resource sources; 2. Add Content-Security-PolicyHTTP header to the server; 3. Use Report-Only mode to test and debug in the initial stage; 4. Continuous monitoring and optimization strategies to ensure that they do not affect normal functions. Notes include handling inline scripts, careful use of third-party resources, compatibility support, and other irreplaceable security measures.

Vite or VueCLI depends on project requirements and development priorities. 1. Startup speed: Vite uses the browser's native ES module loading mechanism, which is extremely fast and cold-start, usually completed within 300ms, while VueCLI uses Webpack to rely on packaging and is slow to start; 2. Configuration complexity: Vite starts with zero configuration, has a rich plug-in ecosystem, which is suitable for modern front-end technology stacks, VueCLI provides comprehensive configuration options, suitable for enterprise-level customization but has high learning costs; 3. Applicable project types: Vite is suitable for small projects, rapid prototype development and projects using Vue3, VueCLI is more suitable for medium and large enterprise projects or projects that need to be compatible with Vue2; 4. Plug-in ecosystem: VueCLI is perfect but has slow updates,