After following, you can keep track of his dynamic information in a timely manner
null means no value, false means logical false, '' means empty string; 1. null is unassigned, false is boolean false, '' is a string of length 0; 2. isset() returns false for null, and returns true for ''; 3.==== comparison, the three are not equal; 4.empty() treats all three as true values; 5. In actual applications, strict comparison and appropriate functions should be distinguished to avoid logical errors.
Jul 31, 2025 pm 12:27 PM
Usetheternaryoperator(?:)forsimpleif-elselogic,assigningvaluesbasedonabooleancondition,butavoidnestingforclarity;2.Preferthenullcoalescingoperator(??)tosafelyhandlenullvaluesandprovidedefaultswithoutbeingtriggeredbyfalsyvalueslike0oremptystrings;3.Ap
Jul 31, 2025 pm 12:26 PM
1. Check the power connection, test the power supply, check the power button, and check the motherboard LED; 2. Enter safe mode, check the disk health, run the startup repair, and uninstall the latest updates; 3. Clear the CMOS, re-insert the memory and graphics card, and disconnect the unnecessary hardware; 4. Check overheating, test the memory, check the event viewer, and repair the system files. Following the steps to quickly solve the problem of most PCs not booting, and they can resume normal startup without replacing the hardware. The problem usually comes from configuration errors or software corruption.
Jul 31, 2025 pm 12:26 PM
Themotherboardchipsetisthecentralhubmanagingcommunicationbetweencomponents;1)itcontrolsdeviceconnectivitylikeUSB,SATA,andPCIelanes;2)determinesoverclockingsupport,withIntel’sZ-seriesandAMD’sX/B-seriesenablingit;3)definesplatformfeaturessuchasPCIe4.0/
Jul 31, 2025 pm 12:25 PM
NestedternaryoperatorsinPHPshouldbeavoidedbecausetheyreducereadability,asseenwhencomparingaconfusingnestedternarytoitsproperlyparenthesizedbutstillhard-to-readform;2.Theymakedebuggingdifficultsinceinlinedebuggingismessyandsteppingthroughconditionsisn
Jul 31, 2025 pm 12:25 PM
TheWebShareAPIenableswebsitestousethedevice’snativesharinginterfacevianavigator.share().2.Itsupportssharingtitle,text,URL,andfiles(limitedbrowsers).3.ItworksonmobilebrowsersoverHTTPSandrequiresausergesture.4.Usefeaturedetectionwithnavigator.shareandn
Jul 31, 2025 pm 12:25 PM
Use early return (guard clause) to avoid nesting, and reduce indentation by processing preconditions at the beginning of the function and returning in advance; 2. Use exception processing to replace error conditions to judge the condition of errors, and hand the exception to the caller to handle to keep the function concise; 3. Replace complex if-elif chains with lookup tables or mapping dictionaries to improve maintainability and readability; 4. Extract complex logic into small functions to make the main process clearer and easier to test; 5. Use polymorphic alternative type judgment in object-oriented scenarios, and realize behavioral expansion through class and method rewrites - these strategies jointly reduce cognitive burden and improve code readability and maintainability.
Jul 31, 2025 pm 12:23 PM
CSSclamp()enablesresponsivetypographybysettingminimum,preferred,andmaximumvaluesthatscalesmoothlywithoutmediaqueries;forexample,font-size:clamp(1.5rem,2.5vw,3rem)ensurestextisneversmallerthan1.5rem,scaleswithviewportwidthbetweensizes,andcapsat3rem,pr
Jul 31, 2025 pm 12:23 PM
Use mix-blend-mode to make text clear and readable on complex backgrounds, such as hero-text setting difference mode; 2. Use filter to achieve lightweight dynamic effects, such as brightness and saturate changes when buttons hover; 3. Use background-blend-mode to create a consistent picture grid style, such as multiply mixing and superimposing gradients and using contrast to enhance visual hierarchy - these are efficient CSS techniques to improve UX, and can achieve dynamic and high-performance visual effects without additional images or JavaScript.
Jul 31, 2025 pm 12:19 PM
PHP's conditional logic has evolved significantly over the past decade, with modern features such as empty merging and empty security operators making the code more concise and secure. 1. Avoid nested ternary operators because they are poorly readable and error-prone; 2. Use the empty merge operator (??) to handle null fallbacks, which are more concise in the syntax and avoid repeated variable checks; 3. Use the empty safety operator (?->) to safely call methods that may be null objects to eliminate lengthy null checks; 4. The ternary operator is only used for simple two-choice scenarios, avoiding mixing with ?? without brackets. Adopting these modern modes can significantly improve the readability, robustness and maintainability of the code, so in PHP8, it should be preferred to use traditional verbose conditional judgments.
Jul 31, 2025 pm 12:17 PM
The@supportsruleinCSSallowsyoutoapplystylesconditionallybasedonwhetherabrowsersupportsaspecificCSSfeature.1.Itworksbycheckingifabrowserrecognizesagivenproperty-valuepair,suchas@supports(display:grid).2.Youcanuselogicaloperatorslikeand,or,andnottocrea
Jul 31, 2025 pm 12:17 PM
__CLASS__ returns the fully qualified name of the class where the code is located, suitable for logging, automatic registration and other scenarios; 2. __TRAIT__ returns the name of the current trait, used to identify the trait itself; 3. Use static::class in trait to obtain the class name using the trait to achieve context awareness; 4. These constants are parsed at compile time, have high performance and support namespace; 5. Compared with get_class($this), __CLASS__ is more suitable for obtaining definition classes rather than instance types. Use these features correctly to build self-aware, reusable, and easy to debug components.
Jul 31, 2025 pm 12:16 PM
PHPevaluateslogicaloperatorsbasedonprecedence,where&&hashigherprecedencethan||and!hashighprecedence;thus,expressionslike$a||$b&&$careevaluatedas$a||($b&&$c),notlefttoright;toensurecorrectlogicandreadability,alwaysuseparenthese
Jul 31, 2025 pm 12:16 PM
WebVitalssignificantlyimpactbothuserexperienceandSEObymeasuringloadingspeed,interactivity,andvisualstability.1.LargestContentfulPaint(LCP)shouldbeunder2.5secondstoensurefastloading,directlyaffectinguserretention.2.FirstInputDelay(FID)mustbeunder100mi
Jul 31, 2025 pm 12:15 PM
Avoidshorthandifstatementswhenlogicisnestedorcomplex,asitreducesreadability;useblockstatementsinstead.2.Avoidthemwhenperformingactionsratherthanassigningvalues,sinceternaryoperatorsaremeantforvalueselection,notcontrolflow.3.Avoidthemwhendebuggingisli
Jul 31, 2025 pm 12:13 PM
WebcomponentsandShadowDOMin2024arestable,nativelysupportedacrossallmodernbrowsers,andwidelyusedforcreatingreusable,encapsulatedUIelementswithoutframeworklock-in.1.TheyconsistofCustomElements,ShadowDOMforstyleandDOMencapsulation,andHTMLTemplatesforreu
Jul 31, 2025 pm 12:13 PM
Cypressisidealforend-to-endtestingofH5applicationsbecauseitrunsdirectlyinthebrowser,supportsmodernJavaScript,enablesviewportanddevicesimulation,andhandlesofflinebehaviorsandstorage;1)InstallCypressandconfigureitwithcypress.config.jstosetbaseURLandvie
Jul 31, 2025 pm 12:11 PM
UseconsistentindentationandbracingtoimprovecodereadabilitybyfollowingPSRstandardsandtoolslikePHP-CS-Fixer.2.Reducenestingdepthwithearlyreturns,handlingeachconditionasaguardclausetoflattenlogicandimprovemaintainability.3.Extractcomplexconditionsintode
Jul 31, 2025 pm 12:09 PM
Internationalization and localization require setting language attributes, using UTF-8 encoding, dynamically formatting content, and managing multilingual resources. 1. Set lang and xml:lang attributes to identify the page language; 2. Use UTF-8 encoding to avoid garbled code and ensure the server configuration is correct; 3. Use Intl objects or framework plug-ins to process related formats such as dates, currency, etc.; 4. Store multi-language content through JSON files, load and provide switching functions according to user preferences.
Jul 31, 2025 pm 12:08 PM
Use ternary operators to handle simple conditional assignments, and use null merge operators to provide default values for null or undefined. 1. The ternary operator is suitable for value allocation of a single condition, avoiding nesting to maintain readability; 2. The empty merge operator (??) only uses the default value when the value is null or undefined, and will not misjudge falsy values such as 0 or empty strings; 3. The conditional logic with default values can be processed in combination; 4. It should not be overused, and if-else should still be used when complex logic or side effects exist to ensure the code is clear and reliable.
Jul 31, 2025 pm 12:07 PM
Improve the core performance indicators of web pages (WebVitals) should start with optimizing the HTML structure, which includes the following points: 1. Reduce unnecessary DOM nodes, avoid excessive nesting, clean up discarded code, and use lightweight tags to shorten the parsing and rendering time; 2. Optimize the key rendering path, use key CSS inline, delay loading non-first-screen resources, and reasonably use async and defer to load scripts to speed up the first rendering; 3. Improve the interaction response speed, load key scripts as soon as possible, avoid a large number of inline scripts, and add loading="eager" to interactive elements; 4. Reasonably set meta tags and semantic structures, and use correct HTML tags and viewport settings.
Jul 31, 2025 pm 12:02 PM
Deeplynestedif-elseblocksreducecodereadabilityandmaintainability;2.Useearlyreturns(guardclauses)toflattenlogicandimproveclarity;3.Centralizevalidationwithresultobjectstoseparateconcernsandsimplifytesting;4.Applyvalidationpipelinesordecoratorsforreusa
Jul 31, 2025 am 11:59 AM
Yodaconditionspreventaccidentalassignmentbugsbyplacingliteralsfirstincomparisons,sousing'='insteadof'=='triggersaparseerror.2.Theyaremosteffectivewhencomparingagainstliteralslikestrings,numbers,orbooleans,suchas'admin'==$userRoleornull===$value.3.The
Jul 31, 2025 am 11:58 AM
In web development, using HTML tags can effectively organize primary navigation and secondary navigation. 1. It is a semantic label that improves code readability and is conducive to SEO and barrier-free access; 2. The main navigation is used for the main entrance of the website, and secondary navigation is often used for internal links on the page; 3. Different navigation areas can be distinguished by aria-label or aria-labeledby attributes; 4. Different styles can be set for different use using class names or IDs in conjunction with CSS; 5. Pay attention to avoid abuse, optimize auxiliary functions, consider responsive design, and avoid nested use. Rational use can improve structural clarity and maintenance efficiency.
Jul 31, 2025 am 11:52 AM
1. Use semantic HTML tags: improve page structure clarity through, etc. tags, avoid abuse of divs and spans, and ensure that screen readers correctly recognize elements. 2. Pictures and alternative text: Add alt attribute with a concise description to each picture, and use alt="" for decorative pictures. 3. Keyboard navigation and focus management: Ensure that all interactive elements can be focused, retained or customized focus styles, and complex components can manually manage focus. 4. Use forms and tags correctly: Use bound form controls to provide clear error prompts to avoid relying on placeholders only. By focusing on these key points, web accessibility can be significantly improved, user experience can be improved, and SEO can be enhanced.
Jul 31, 2025 am 11:48 AM
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
