After following, you can keep track of his dynamic information in a timely manner
KeepdependenciesupdatedusingnpmauditortoolslikeSnyk;2.UseHelmettosetsecureHTTPheaders;3.Validateandsanitizeuserinputwithlibrarieslikeexpress-validator;4.Storesecretsinenvironmentvariablesviadotenvandnevercommitthem;5.Implementsecureauthenticationwith
Jul 29, 2025 am 01:31 AM
Equal-heightcolumnsareachievedusingdisplay:flexwithflex-wrapandflex:11200pxoncards,allowingresponsivewrappingandnaturalheightalignmentwithoutmediaqueries.2.Auto-spacingisenabledviamargin:autoonflexitems,pushingelementslikenavigationtotheedgewhilemain
Jul 29, 2025 am 01:30 AM
If the server only needs to push data to the client (such as notifications, logs, and market conditions), choose SSE, because it is based on HTTP, supports automatic reconnection, and is simple to implement; 2. If the client and the server need to frequently communicate in two-way (such as chat, collaborative editing, and games), you must choose WebSocket; 3. If the system is based on HTTP architecture and wants to reduce the integration complexity, SSE is preferred; 4. If binary data is needed or run in a non-browser environment, you should choose WebSocket; 5. When the browser compatibility requirements are extremely high and you need to support old versions of IE, avoid SSE and choose WebSocket; the final choice should be based on comprehensive judgment of communication direction, protocol compatibility, deployment complexity and data type to match the actual scenario requirements.
Jul 29, 2025 am 01:30 AM
Create a minimum permission user, use role management, clean up permissions regularly, pay attention to permission levels and take effect. Create users who can only operate specific database tables for web applications to avoid global authorization; create roles to manage multi-user permissions uniformly, modify roles to update synchronously; regularly use SELECTUser and SHOWGRANTS to check and delete invalid accounts and high-risk permissions; set permissions to distinguish between global, database, table and other levels, and then perform FLUSHPRIVILEGES after modification, and ensure that the host matches when users connect to ensure security and maintenance efficiency.
Jul 29, 2025 am 01:30 AM
StreamsinNode.jsenableefficient,chunkeddataprocessingtoreducememoryusageandimproveperformance.1.StreamsareEventEmittersthathandledataasreadable,writable,duplex,ortransformtypes.2.Theyoperateinflowingorpausedmode,withflowingmodebeingcommonviaeventlist
Jul 29, 2025 am 01:28 AM
Define CSS variables for bright and dark themes, use: root to set the default bright and dark theme, and the .dark-mode class overwrites as dark themes; 2. Add a button to switch modes in HTML; 3. Use JavaScript to switch themes through the classList.toggle method to switch themes; 4. Use localStorage to save user preferences so that the page is overloaded; 5. Optionally, detect prefers-color-scheme through window.matchMedia to match system themes by default. Finally, a lightweight, maintainable and user-experienced dark mode function is achieved
Jul 29, 2025 am 01:27 AM
To ensure the security of MySQL in the microservice architecture, we need to start from four aspects: access control, encrypted transmission, permission management and log audit. 1. Strengthen access control, create dedicated users and restrict connection source IP, and protect database ports in combination with firewalls or network policies; 2. Enable TLS encryption, configure SSL certificates and force clients to use encrypted connections; 3. Implement the principle of minimum permissions, divide user permissions by business, and avoid global permission abuse; 4. Establish monitoring and log audit mechanisms, centrally analyze logs and set sensitive operation alarms, and promptly discover abnormal behaviors.
Jul 29, 2025 am 01:27 AM
Row selection is implemented through enableRowSelection and rowSelection state, coordinated with setRowSelection to manage the selected state, and use getFilteredSelectedRowModel to obtain selected rows for batch operation; 2. Nested subtables use getSubRows to define subdata, combine row.getCanExpand and getIsExpanded to control the expansion state, and render subrow contents through getExpandedRowModel; 3. Column drag and drop ordering requires the @dnd-kit library to be introduced, encapsulate the table header as drag-able items in SortableContext, and after dragging,
Jul 29, 2025 am 01:26 AM
The core methods of extending Vue instances include: 1. Mixin mixed in public logic, suitable for multiple components to share data, methods, life cycle hooks and other options; 2. Use extends to extend existing constructors, suitable for inheritance based on basic classes; 3. Use Composition API in Vue3 to extract reusable logic. The life cycle in Mixins will be executed before the component itself, and the method of the same name is mainly composed of components; extends is mainly used to create derived constructors; Composition API uses function combination logic to avoid naming conflicts and improve maintenance. When using it, you should pay attention to merging strategies, avoid overuse of mixin, and give priority to Vue3 recommended
Jul 29, 2025 am 01:26 AM
Toimplementablockchain-liketableinMySQL,usestandarddatabasefeaturessuchastriggers,hashfunctions,andaccesscontroltosimulateimmutabilityanddataintegrity.1)Designthetablewithfieldsforid,previous_hash,data,timestamp,andhashtoformachain;2)Enforceimmutabil
Jul 29, 2025 am 01:26 AM
Use golang.org/x/time/rate to implement basic IP-based current limits, and apply 5 requests per second and 10 bursts per second to each client through middleware; 2. By starting a regular cleaning of goroutine, clear client entries that have not been active for a long time to avoid memory leaks; 3. Use a custom structure containing the current limiter and the last access time to improve the tracking accuracy; 4. In production environments, use Redis to implement distributed current limiting, API key-based identity identification, hierarchical current limiting strategy and return standard current limit response headers such as X-RateLimit-Limit and Retry-After.
Jul 29, 2025 am 01:25 AM
In web development, use and tags can improve the semantics and structural clarity of content. 1. Used to wrap independent content blocks such as pictures, charts, etc.; 2. Add titles or descriptions to these contents; 3. Combination of the two enhances accessibility and SEO effects; 4. Applicable to content with independent meaning and titles such as charts in technical articles; 5. The basic structure consists of one containing content and composition; 6. Flexible position and should avoid nesting use.
Jul 29, 2025 am 01:25 AM
Vite can rise rapidly because its development stage uses ES modules to compile on demand, combined with esbuild pre-built, realizes second-level startup and extremely fast hot updates, significantly improving the development experience; Webpack has not been eliminated because of its huge ecosystem, highly customizable, and stable production construction, which is suitable for complex scenarios and old projects; Vite's limitations include the dynamic introduction of CommonJS, the SSR and micro front-end ecosystem is immature, compatible with old browsers, and the plug-in ecosystem is relatively small; the future trend is to coexist in layers: Vite is the first choice for new projects, and large existing projects continue to use Webpack, and the ultimate performance scenario may turn to emerging tools such as Turbopack. Construction tools will tend to be lightweight, fast, and low configuration, while Webp
Jul 29, 2025 am 01:25 AM
The dir attribute is used to control the writing direction of text in HTML elements. The main values are ltr (left to right), rtl (right to left) and auto (automatic detection); 1. It ensures that Arabic, Hebrew and other languages are correctly displayed from right to left, avoiding problems such as punctuation and alignment; 2. It affects the layout behavior of text alignment, table sequence, list items and input box text position; 3. It can be applied to the entire page, specific blocks or form controls, and adapts to multilingual scenes; 4. Use dir instead of CSSdirection first, pay attention to inheritance and override, and avoid relying on imperfect auto recognition.
Jul 29, 2025 am 01:24 AM
TomasterJavatestingwithJUnit5andMockito,useunittestsforisolatedcodewithmockeddependenciesandintegrationtestsforrealcomponentinteractions.1.Unittestsfocusonsinglemethodsorclassesusing@Mockand@InjectMockstoisolatelogic.2.Integrationtestsvalidatefullwor
Jul 29, 2025 am 01:24 AM
How to deploy and use PMM to monitor MySQL? 1. Install PMMServer: pull the image through Docker and run the container, map ports 80 and 443, and access the web page initialization configuration; 2. Access MySQL instance: Install PMMClient on the target server, register to the Server and add MySQL monitoring to ensure that MySQL users have permissions such as PROCESS and REPLICATIONCLIENT; 3. Frequently asked questions: The page loads slowly and can adjust the Prometheus collection frequency, and the client's running status needs to be checked if the data is not updated. The verification test can be temporarily closed when the historical data is lost. The retention period can be extended through remote storage;
Jul 29, 2025 am 01:24 AM
Dask is chosen because it is compatible with Pandas and NumPy, supports delayed execution and parallel processing, and is suitable for big data scenarios. 1. Can process data beyond memory; 2. Use multi-core CPU to improve speed; 3. Support gradual migration to distributed environments; 4. DaskDataFrame is similar to Pandas, but requires call .compute() to execute; 5. Avoid frequent compute(), reasonable partitioning, and optimize time series queries; 6. Optional schedulers include threads, processes or clusters; 7. Performance optimization includes controlling partition size, column cropping, using Parquet format and cache intermediate results.
Jul 29, 2025 am 01:23 AM
Using IntersectionObserver API to achieve lazy loading can effectively improve page loading speed and reduce bandwidth consumption; 2. By storing the real image address in the data-src attribute, combined with IntersectionObserver listening elements to load the image when they enter the viewport; 3. The advance loading conditions can be configured through threshold and rootMargin to optimize the user experience; 4. Placeholders and fixed width and height should be set to prevent layout offset; 5. The same method is suitable for lazy loading of embedded content such as iframes; 6. The performance of this solution is better than traditional scroll event monitoring, and modern browsers widely support it. If necessary, loading="la can be downgraded if necessary
Jul 29, 2025 am 01:23 AM
Yes,Yiiisrecommendedforpersonalprojectsduetoitsrapiddevelopmentcapabilitiesandscalability.1)ItsimplifiesdatabaseinteractionswithActiveRecord.2)OffersrobustsecurityfeatureslikeCSRFprotection.3)However,itmaybeoverkillforverysmallprojects,andhasasmaller
Jul 29, 2025 am 01:22 AM
inputmode is an attribute in HTML that prompts the mobile terminal to display a specific virtual keyboard type. It does not change the input format but improves the experience. Common values include text, tel, url, email, numeric, and decimal. They are suitable for different scenarios, such as tel for phone numbers, decimal for amounts, and numeric for quantity, while the search box is kept text. When using it, you need to pay attention to the difference between it and type. Inputmode is more suitable for scenarios where only the keyboard type is needed without changing the input behavior. It can optimize the input effect with pattern, but it cannot be replaced by single verification, and excessive use should be avoided.
Jul 29, 2025 am 01:22 AM
:has() pseudo-class allows selection of parent or sibling elements that contain specific child elements. 1. It can be used to style containers according to content (such as .card:has(img)); 2. Style the associated labels (such as label:has(input:invalid) turns red); 3. Support sibling selection (such as h2:has(p.error) adjust spacing); 4. Support complex combinations (such as article:has(h1,.featured-image,p:nth-of-type(3)) set margins), pay attention to browser support (supported by mainstream browsers in 2024), performance impact, and avoiding use in animation, which greatly reduces the margins on JavaS
Jul 29, 2025 am 01:21 AM
Use JUnit5 and Mockito to effectively isolate dependencies for unit testing. 1. Create a mock object through @Mock, @InjectMocks inject the tested instance, @ExtendWith enables Mockito extension; 2. Use when().thenReturn() to define the simulation behavior, verify() to verify the number of method calls and parameters; 3. Can simulate exception scenarios and verify error handling; 4. Recommend constructor injection, avoid over-simulation, and maintain test atomicity; 5. Use assertAll() to merge assertions, and @Nested organizes the test scenarios to improve test maintainability and reliability.
Jul 29, 2025 am 01:20 AM
To support legacy browsers to use modern WebAPIs at the same time, polyfill needs to be filled with missing functions. 1. Select well-maintained polyfill libraries such as core-js, whatwg-fetch, etc.; 2. Only the required polyfill is introduced according to the target browser; 3. Use feature detection or Polyfill.io to load on demand to reduce bandwidth waste; 4. Use Babel's @babel/preset-env in build tools such as Webpack or Vite to automatically inject polyfill on demand; 5. Always test in real or simulated old browser environments to ensure compatibility; 6. Common APIs that require polyfill include Promise,
Jul 29, 2025 am 01:20 AM
MongoDB's flexibility does not mean abandoning data integrity. By combining built-in document verification, reasonable verification behavior control, progressive mode evolution, application-level verification and automated monitoring, a robust architecture that takes into account flexibility and data quality can be built. 1. Use collection-level document verification ($jsonSchema) to ensure compliance with required fields, data types, value ranges and enumeration values; 2. Control the execution of the verification through validationAction ("error" or "warn") and validationLevel ("strict" or "moderate")
Jul 29, 2025 am 01:20 AM
Eloquent query scope improves code clarity and reusability by encapsulating common query logic. 1. The local scope is defined with a method starting with scope, such as scopeActive() is used to filter enabled users; 2. The dynamic scope supports parameter passing, such as scopeStatus($status) to achieve flexible state filtering; 3. The global scope is automatically applied to all queries, suitable for data isolation but needs to be used with caution; 4. Multiple scopes can be combined in chains to enhance semantic expression and maintenance; 5. Complex queries can be centrally processed through conditional judgments to improve flexibility.
Jul 29, 2025 am 01:19 AM
Chrony is a lightweight and efficient time synchronization tool in Linux. The configuration steps are as follows: 1. Modify the /etc/chrony.conf file, add the server to point to the NTP server and use the iburst parameter to accelerate synchronization; 2. Restart the chrony service after saving, pay attention to the service name chronyd or chrony; 3. Verify the synchronization status through chronycsources-v and chronyctracking; 4. Ensure that the firewall opens UDP123 port and can use makestep to manually synchronize time. Common public NTP servers include pool.ntp.org and time.google.com, and are built in time.
Jul 29, 2025 am 01:19 AM
Unexpected global variables can be avoided through "usestrict"; 2. Uncleaned event listeners need to be removed or used when component is destroyed; 3. Closures may cause external variables to be unable to be released, and unused closures should be avoided for a long time; 4. The timer refers to external objects to call clearInterval when no longer needed; 5. The cache should limit the size, and use WeakMap or WeakSet first to avoid preventing garbage collection; 6. The Memory and Performance panels of ChromeDevTools can detect memory leaks, and use timeline location issues through heap snapshots and memory allocation; 7. Preventive measures include timely
Jul 29, 2025 am 01:17 AM
Java21 introduces Foreign Function & MemoryAPI to solve the complexity, poor security, and large performance overhead of JNI; 2. Core components include MemorySegment (memory abstraction), ValueLayout/MemoryLayout (memory layout), SymbolLookup (function symbol search), FunctionDescriptor and MethodHandle (function call definition), Arena (memory life cycle management); 3. Pure Java code can safely and efficiently call local functions and operate off-heap memory, without writing C code or manually managing memory; 4. Compared with JN
Jul 29, 2025 am 01:16 AM
PHPalonecannothandleWebSocketsduetoitsrequest-responsenature,butitcansupportreal-timefeaturesbyhandlingauthentication,businesslogic,anddatamanagement;2.UseRatchet,aPHPWebSocketlibrarybuiltonReactPHP,tocreateapersistentserverforbidirectionalcommunicat
Jul 29, 2025 am 01:16 AM
The integration of AI and SQL is reshaping data analysis and decision-making methods, which are mainly reflected in three aspects: First, AI can generate SQL queries based on natural language, lowering the threshold for use; Second, AI can analyze query log recommendation index optimization to improve database performance; Third, AI can predict SQL behavior and detect abnormalities, enhancing system stability and security. Although AI enhances SQL's capabilities, the statements it generates still need to be reviewed manually, and index suggestions also need to be judged based on actual conditions. The overall trend is technical collaboration rather than substitution, which not only improves efficiency, but also lowers the technical threshold.
Jul 29, 2025 am 01:15 AM
