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PHPrunsontheserver,processingcodeandsendingHTMLtothebrowser,keepinglogicsecurebutrequiringserver-sidedebuggingtools.2.PHPusesdynamictyping,allowingflexiblevariabletypesbutrecommendingstrictcomparisonsandinputvalidationtopreventbugs.3.Controlstructure
Jul 31, 2025 am 11:45 AM
UninstallunusedprogramsanddeleteunnecessarypersonalfilesfromfolderslikeDownloadsandDesktop.2.Usebuilt-intoolslikeDiskCleanuponWindowsorStorageManagementonMactoremovetemporaryfiles,cache,andsystemlogs,andclearbrowsercacheregularly.3.Identifylargefiles
Jul 31, 2025 am 11:43 AM
Theternaryoperatorisaconcisewaytowritesimpleif-elsestatementsinoneline,improvingcodereadabilitywhenusedappropriately.2.Itfollowsthesyntaxcondition?valueIfTrue:valueIfFalseinlanguageslikeJavaScriptandC ,whilePythonusesvalueIfTrueifconditionelsevalueI
Jul 31, 2025 am 11:42 AM
article is used for standalone content, such as blog posts or comments; section is used for logical grouping, such as navigation or footer. ①Article represents content units that can be distributed independently, suitable for blogs, news, comments and other scenarios; ②section is used to organize blocks of different functions or topics on the page, such as navigation bars and product modules; ③The two can be used in nesting, such as sections to divide blocks, and articles to carry independent content internally; ④ When choosing, it should be decided based on whether the content is independent and complete, so as to avoid abuse or substitution with divs.
Jul 31, 2025 am 11:42 AM
TooptimizeCSSdeliveryandimprovepageloadspeed,firstinlinecriticalCSSneededforabove-the-foldcontentdirectlyintheHTMLhead,thendefernon-criticalCSSusingrel="preload"ormedia="print"withJavaScriptonloadswitching;minifyCSSbyremovingwhite
Jul 31, 2025 am 11:40 AM
HTML5 has obvious improvements compared to HTML4, which are mainly reflected in five aspects: 1. The semantic structure is clearer, and new tags are added; 2. The form function is enhanced, and the input types such as email, url, date, and placeholder and required attributes are supported; 3. The native support for multimedia, and the audio and video are directly embedded with tags; 4. The DOCTYPE declaration is simplified to; 5. The syntax is looser, and no longer depends on DTD and does not force the tags and quotes to be closed. These improvements improve development efficiency, page readability, and browser compatibility.
Jul 31, 2025 am 11:38 AM
Views are suitable for report development because they encapsulate complex logic, standardize outputs, and control permissions. For example, create a customer_order_summary view to count the total customer order amount and simplify the query of the upper-level application. Designing efficient report views requires maintaining a single responsibility, avoiding deep nesting, paying attention to performance impacts, and being clearly named. The management view should be documented, regularly reviewed, optional version control, and a testing mechanism should be established. Although the last view is good, do not abuse it. The OLTP scenario may increase the pressure on the database.
Jul 31, 2025 am 11:36 AM
Dynamic constant parsing can be implemented through defined() and constant() functions. First, use defined() to check whether the constant exists, and then use constant() to obtain its value to avoid undefined errors. 1. defined('CONST_NAME') returns a boolean value, used to determine whether a constant has been defined, and a constant name string must be passed in. 2.constant('CONST_NAME') returns the value of the corresponding constant and supports dynamic splicing names. 3. Practical applications include: multi-environment configuration management, automatically loading the corresponding configuration through environment variable splicing constant names; dynamic reading of module constants in the plug-in system; and combining encapsulation functions to achieve default value fallback. 4. Notes: Constant name
Jul 31, 2025 am 11:34 AM
Front-end interviews examine basics, coding, projects and new technologies. 1. HTML/CSS: Semantic tags improve SEO and accessibility; box model is divided into standards and IE models, and is controlled by box-sizing; Flex is used for one-dimensional layout, and Grid is used for two-dimensional layout, and masters common attributes. 2. JavaScript: Closures are used in counters, caches and other scenarios; prototype chains implement inheritance, distinguishing proto and prototype; asynchronous programming goes from callback to Promise to async/await, understand event loops and be able to hand-written Promise.all. 3. Framework: React life cycle includes componentDidMount and useEffect
Jul 31, 2025 am 11:32 AM
Date and time processing in SQL varies from database to database, so you need to pay attention to the type difference and the time zone problem of function use. 1. Different database date types are different, such as DATE/DATETIME/TIMESTAMP for MySQL, DATE and TIMESTAMP for PostgreSQL, DATE/DATETIME/DATETIME2 for SQLServer, DATE and TIMESTAMP for Oracle. 2. Get the current time function different, such as NOW() or CURRENT_TIMESTAMP for MySQL/PostgreSQL, GETDATE for SQLServer
Jul 31, 2025 am 11:31 AM
NeverstoresensitivedatalikeAPIkeysordatabasecredentialsinfront-endenvironmentvariablesbecausetheyareembeddedintheJavaScriptbundleandexposedtousers;instead,useaback-endproxyforsecureoperations.2.Useproperlynamed.envfilessuchas.env,.env.development,.en
Jul 31, 2025 am 11:29 AM
Use let and const to implement block-level scope, avoid the variable promotion problem of var, and use const first to prevent unexpected assignment; 2. Arrow functions simplify syntax and correctly bind this, suitable for callback functions but cannot be used as constructors; 3. Deconstruction assignments can extract data from arrays or objects, support renaming and deconstructing function parameters, and improve code readability; 4. Template strings use backticks and ${} to insert variables, support multi-line text and expressions, and replace traditional string splicing; 5. Default parameters provide default values for functions, and the extension operator (...) is used to merge arrays, objects and expand iterable objects; 6. Modularly implement code separation and reuse through import and export, supporting named export and default export, supporting naming export and default export.
Jul 31, 2025 am 11:28 AM
First, native touch events should be used and combined with gesture libraries to effectively handle touch and gesture interactions in mobile web. 1. Use touchstart, touchmove, touchend and touchcancel events to achieve basic touch detection, and pay attention to setting passive:true when preventDefault() is not required to improve scrolling performance; 2. Manually realize simple gestures such as sliding left and right by recording the coordinate difference between touchstart and touchend, but pay attention to performance optimization and threshold setting; 3. It is recommended to use mature gesture libraries such as Hammer.js to handle complex gestures (such as zooming, rotation, and long pressing) to reduce compatibility issues.
Jul 31, 2025 am 11:26 AM
AWSThena and AzureSynapse each have their own advantages, and the choice needs to be combined with actual scenarios. 1. In terms of data format, Athena is based on Presto, supports Parquet, ORC, JSON, etc., which is suitable for structured data; Synapse is more flexible in handling semi-structured or non-standard formats such as nested JSON. 2. In terms of billing method, Athena bills according to the scanned data volume, with a fixed cost per TB, which is convenient for budget control; Synapse bills according to DWU resource consumption, and the fees float with execution time and concurrently. 3. In terms of integration ecology, Athena is more suitable for AWS ecosystem users and integrates well with Glue, S3, QuickSight, etc.; Synapse and Po
Jul 31, 2025 am 11:23 AM
SvelteKit is based on the compile-time framework Svelte, without virtual DOM, with lighter runtime and higher performance, especially suitable for performance-sensitive scenarios; 2.Next.js is based on React, with a huge ecosystem, smooth learning curve, suitable for team collaboration and rapid development; 3.SvelteKit performs better in package size, first-screen loading and hydration optimization, and supports island architecture; 4.Next.js is more mature in enterprise-level projects, complex integration and deployment support; 5. If you pursue performance and concise syntax, choose SvelteKit. If you value ecology and collaboration, choose Next.js, choose based on project requirements and team technology stack.
Jul 31, 2025 am 11:17 AM
ShadowDOMandVirtualDOMsolvedifferentproblems:1.ShadowDOMisabrowserAPIforencapsulatingDOMandCSSwithinWebComponents,preventingstyleleaksandenablingscopedstyling.2.VirtualDOMisaframework-levelconceptusedbyReact,Vue,etc.,tooptimizeUIupdatesbyminimizingdi
Jul 31, 2025 am 11:16 AM
Nuxt3isareimaginedVue-basedmeta-frameworkthatenhancesdeveloperexperienceandperformancethroughmodernarchitecture.Itisrenderer-agnostic,supportingSSR,SSG,andCSR,andusestheNitroengineforframework-agnosticdeploymentacrossplatformslikeVercel,Netlify,oredg
Jul 31, 2025 am 11:14 AM
SQLServerProfiler is used for performance monitoring and query analysis, and captures critical data by setting filter conditions. 1. How to use: Open Profiler in SSMS, create a new tracking and select a template, and set filter conditions such as Duration, CPU, Reads/Writes, ApplicationName, etc. to reduce the amount of data. 2. Pay attention to events and columns: Focus on tracking SQL:BatchCompleted, RPC:Completed, SP:StmtCompleted events, and enable Duration, CPU, Reads/Writes, StartTime/EndTime, TextD
Jul 31, 2025 am 11:12 AM
Choosing the right SQL data type can significantly improve database performance and storage efficiency. 1. Integer types should be selected according to the value range, such as TINYINT for user gender, TINYINTUNSIGNED for status code, and INT for million-level user ID, to avoid wasting space with BIGINT; 2. CHAR in string type is suitable for fixed-length data, VARCHAR is suitable for variable-length content, which can save storage and avoid potential problems of temporary tables in memory; 3. Date and time types need to distinguish between DATE dates, TIMESTAMP saves space and has time zone impact, DATETIME is suitable for scenarios that do not depend on time zones, and can use the automatic update function to simplify logic; 4. Boolean value recommended TINYINT(1) or BOOLE
Jul 31, 2025 am 11:11 AM
ARIALandmarkRoles is a semantic role used to identify specific functional areas in a web page to improve navigation efficiency for screen reader users. 1.role="banner" is used for website logos and main navigation; 2.role="navigation" identifies the link collection such as menu; 3.role="main" represents the main content area; 4.role="complementary" indicates the auxiliary content such as the sidebar; 5.role="contentinfo" is used for copyright and other bottom information. Priority should be taken when using
Jul 31, 2025 am 11:09 AM
SQL aggregation functions such as SUM, AVG, COUNT, MAX, and MIN are used to analyze and summarize data in databases. First, COUNT is used to count the number of records, such as SELECTCOUNT(*)FROMorders, which can obtain the total number of orders; second, SUM and AVG calculate the sum and average values respectively, which are suitable for numerical data, such as SELECTSUM(amount)AStotal_sales, AVG(amount)ASaverage_saleFROMsales, which can obtain the total sales and average sales; third, MAX and MIN are used to find the maximum and minimum values, which can be used for numbers, dates or strings, such as SELECTMAX
Jul 31, 2025 am 11:07 AM
IPSpanelsofferthebestcoloraccuracyandviewingangles,makingthemidealforcreativeprofessionalsandmultimediause.2.VApanelsprovidehighcontrastratiosandbalancedcolorperformance,suitableformoviesandgeneralproductivity.3.TNpanelsdeliverthefastestresponsetimes
Jul 31, 2025 am 11:06 AM
Effective front-end caching strategies need to be implemented in layers: 1. Browser cache controls local storage of static resources through HTTP headers such as Cache-Control, sets long max-age (such as one year) for files with hashings and uses immutable, and uses no-cache to ensure re-verification of HTML files; 2. ServiceWorker implements advanced cache logic, such as cache priority, stale updates or network priority policies, which are suitable for PWA and third-party resources, but cache content should be carefully selected to avoid storage waste; 3. CDN cache accelerates content distribution through global edge nodes, relying on the correct Cache-Control header, versioned URL and the active clearing API when necessary to manage cache validity
Jul 31, 2025 am 11:05 AM
Choose CompositionAPI or OptionsAPI? The answer depends on the size of the project, team habits and development needs. 1. When small projects or teams are familiar with Vue2, it is recommended to use OptionsAPI because its structure is clear, easy to understand and official continuous support; 2. When logical reuse or processing complex components, Composition API should be selected, which centralizes logic through combining functions to improve maintainability and reusability; 3. In terms of development experience, OptionsAPI is simpler and direct, suitable for teaching and rapid development, while Composition API requires understanding of responsive mechanisms, but it is better to cooperate with TypeScript; 4. Recommended to maintain old projects or teams that have just been upgraded.
Jul 31, 2025 am 11:03 AM
Use HTML5 built-in verification to provide basic verification (such as required, type, pattern and other properties), and basic form verification can be achieved without JavaScript; 2. Real-time feedback is achieved through JavaScript to listen to input, blur and submit events to improve user experience; 3. Use JavaScript to implement custom rules such as password strength and confirmation fields; 4. Always verify secondaryly on the server side, because front-end verification can be bypassed, back-end verification is the security guarantee.
Jul 31, 2025 am 10:54 AM
MySQL's binary log (binlog) has three formats: STATEMENT, ROW and MIXED. 1. The STATEMENT format records the SQL statement itself. The advantage is that the log size is small, but it may lead to inconsistency between master and slave; 2. The ROW format records row data changes, the master and slave consistency is high, but the log size is large and the writing pressure is high; 3. The MIXED format automatically selects STATEMENT or ROW, taking into account both efficiency and safety, and it is recommended to use by default. The format should be selected according to business needs: STATEMENT can be used in the reporting system, ROW can be used in high consistency scenarios, and MIXED can be used in balanced selection. Modifying the format can be achieved through commands or configuration files, and the master and slaves need to be consistent to avoid copy errors.
Jul 31, 2025 am 10:50 AM
The Schema.org tag helps search engines understand the structured data format of web page content through semantic tags (such as item scope, item type, itemprop); it can be used to define custom vocabulary, methods include extending existing types or using additionalType to introduce new types; in actual applications, keeping the structure clear, using official attributes first, testing code validity, and ensuring that custom types are accessible; precautions include accepting partial support, avoiding spelling errors, and choosing a suitable format such as JSON-LD.
Jul 31, 2025 am 10:50 AM
Use the Spaceship Operator () for intelligent comparison. It returns -1, 0 or 1 when the left operand is less than, equal to or greater than the right operand, respectively. It is suitable for array sorting, dictionary comparison of strings and arrays, and supports multi-level sorting; 2. Use the empty merge operator (??) to safely provide the default value, and return the left operand when the left operand exists and is not null. Otherwise, it returns the right operand. It can be called chained to achieve multi-level backoff to avoid warnings of undefined variables, which is safer than the ternary operator combined with isset(); 3. In actual scenarios, both can be combined, such as using ?? to process the default values of API parameters, and implement flexible sorting logic, thereby reducing redundant code, preventing errors and improving code readability.
Jul 31, 2025 am 10:47 AM
Use the Viper library to combine structures to manage Go application configurations. 1. Define the structured configuration structure and load it from files, environment variables and other sources through Viper; 2. Priority is given to using environment variables in the production environment and set default values and prefixes to avoid conflicts; 3. Verify the configuration at startup to ensure that the configuration is valid, and field verification can be combined with the validator library; 4. Sensitive information such as passwords and API keys should be managed through dedicated services such as environment variables or AWSSecretsManager, and will never be submitted to version control; ultimately, the configuration flexibility, security and environment isolation are achieved to ensure that the application runs reliably in different deployment environments.
Jul 31, 2025 am 10:46 AM
To get different values from SQL tables, there are several ways to do this. 1. Use the DISTINCT keyword to extract simple values, such as SELECTDISTINCTcategoryFROMproducts; 2. Replace with GROUPBY, especially when it involves aggregate functions; 3. Optimize performance by adding indexes, such as CREATEINDEXidx_categoryONproducts(category); 4. Use subqueries or CTE to organize logic in complex scenarios to improve readability and efficiency. Different methods are applicable in different situations. Daily use of DISTINCT is enough, but understanding other methods can help improve performance and flexibility.
Jul 31, 2025 am 10:46 AM
