After following, you can keep track of his dynamic information in a timely manner
Pathmorphingviadattributeanimationenablesshapetransitions,requiringmatchingpathcommandsortoolslikeFlubberforinterpolation.2.Strokeanimationusesstroke-dasharrayandstroke-dashoffsetsettothepath’stotallength,thenanimatesoffsettozerofordrawingeffects.3.S
Aug 01, 2025 am 07:27 AM
Use custom cubic-bezier functions to accurately control the acceleration and deceleration of transitions, improving the naturalness of animation; 2. Use @keyframes to define multi-stage animations, combine transform, opacity and filter to achieve complex animation effects, and maintain the final state through forwards; 3. Use nth-child to combine animation-delay or CSS custom attributes to realize interleaving animation of list items; 4. To ensure performance, only animation of GPU acceleration properties such as transform and opacity to avoid triggering release layout re-arrangement, use transform:translateZ(0) to enable hardware acceleration if necessary; 5.
Aug 01, 2025 am 07:25 AM
Accessed through params hash in RubyonRails, using the strong parameter mechanism of require/permit; obtain input through the Request object in Laravel, and support direct verification; use req.query, req.params and req.body to process different types of parameters in Express.js; use @RequestParam, @PathVariable and @RequestBody annotations to extract data in SpringBoot. The specific methods are: 1. Rails uses params[:key] to obtain parameters and filter them with strongparams; 2.Lar
Aug 01, 2025 am 07:25 AM
When using filters in the controller, if you encounter logic shared by multiple operations (such as authentication, logging, etc.), filters should be used first to keep the code tidy and reusable. 1. Filters are logical blocks that run before and after the action is executed, used to handle tasks across multiple operations; 2. Application of filters is usually implemented by adding attributes to the controller or action method, such as [Authorize]; 3. Creating a custom filter requires implementing a specific interface, such as IActionFilter, and can be checked before the action is executed; 4. Global filters can be applied to all requests through registration, and are suitable for anti-counterfeiting protection, website-wide HTTPS mandatory and other scenarios. By using filters reasonably, you can effectively reduce duplicate code and improve the application's
Aug 01, 2025 am 07:25 AM
AdefaultserverblockinNginxisconfiguredtohandleunmatcheddomainrequests,ensuringunknowntrafficgetsacontrolledresponse.Tosetoneup:1)createaserverblockwiththedefault_serverparameteronthelistendirective,2)use_astheserver_nametocatchallunmatcheddomains,and
Aug 01, 2025 am 07:24 AM
StatefulSets is suitable for deploying MySQL because it provides stable network identity and persistent storage. Each Pod has an independent host name (such as mysql-0, mysql-1) for easy master-slave configuration, combined with HeadlessService to implement DNS resolution, and each Pod binds a PVC to ensure data durability; the deployment steps include creating a HeadlessService, defining StatefulSet, configuring environment variables, and using volumeClaimTemplates; in terms of storage, you need to allocate independent PVC for each Pod, selecting a suitable StorageClass and ensuring that the data directory is mounted to a persistent volume; if it is highly available, you need to manually configure the master.
Aug 01, 2025 am 07:23 AM
MySQL trigger is a stored program that is automatically executed on tables, suitable for data consistency maintenance, change logging, business rule implementation and other scenarios. Its creation includes defining the trigger timing (BEFORE or AFTER), event type (INSERT, UPDATE, DELETE), association tables and specific logic. For example, a log can be logged when the user inserts: CREATETRIGGERafter_user_insertAFTERINSERTONusersFOREACHROWBEGINSERTINTOuser_logs...END. BEFORE triggers can be used for data verification, such as limiting discounts not exceeding 50%: CRE
Aug 01, 2025 am 07:22 AM
To start drawing 20 figures using HTML canvas, first you need to create the canvas element and get the 2D context; 1. Add tags with id, width and height in HTML; 2. Use JavaScript to get canvas through getElementById and call getContext('2d') to get the drawing context; 3. Use fillRect to draw rectangles; 4. Use beginPath, moveTo, lineTo and closePath to create paths to draw custom shapes such as triangles; 5. Use arc to draw circles or arcs; 6. Set fillStyle and strokeS
Aug 01, 2025 am 07:21 AM
When deleting data in Yii, you should choose the appropriate method according to the scene. To delete a single record, you must first use findOne() or find()->where(...)->one() to load the model, and then call the delete() method, such as $model=Post::findOne(123); if($model!==null){$model->delete();}; this method will trigger the beforeDelete and afterDelete events. To delete multiple records, use Post::deleteAll(['author_id'=>456]) or with conditions
Aug 01, 2025 am 07:21 AM
ROW_NUMBER, RANK and DENSE_RANK are three ranking functions in SQL window functions. The difference is that they handle duplicate values in different ways. 1.ROW_NUMBER assigns a unique incremental number to each row, and there is no parallel, which is suitable for scenarios where unique numbers are required; 2. RANK allows for parallel but subsequent rankings to skip numbers, which is suitable for scenarios where numbers are allowed such as competition rankings; 3. DENSE_RANK allows parallel but no jump numbers, which is suitable for scenarios where you want to rank continuously. The choice of the three depends on whether the tie is allowed and whether the ranking jump is accepted.
Aug 01, 2025 am 07:20 AM
INPmeasuresapage’sresponsivenesstouserinteractions,withgoodperformancebeing≤200ms,needsimprovementat200–500ms,andpoorat>500ms,directlyimpactingusersatisfaction.2.LongJavaScripttasksblockthemainthread,delayingresponsestoclicksortaps,sobreakinguptas
Aug 01, 2025 am 07:19 AM
Sometimes it will affect performance, depending on the language, compiler optimization and logical structure; 1. If statements are executed in order, and the worst case time complexity is O(n), the most likely condition should be placed first; 2. The switch statement can be optimized by the compiler to a jump table of O(1) when the conditions are continuous integers, many branches and the values are compiled constants; 3. When a single variable is compared with multiple constant integers and there are many branches and switches are faster; 4. When it involves scope judgment, complex conditions, non-integer types or fewer branches, if if is more suitable or has similar performance; 5. Different languages (such as C/C, Java, JavaScript, C#) have different optimization degrees of switches, and they need to be tested in combination with actual testing; Swi should be used first
Aug 01, 2025 am 07:18 AM
Common types of SQL error reporting include syntax errors, column non-existence, null values of aggregate functions and subquery multiple values. 1. Syntax errors need to be checked from the error report position, and formatting tools can be used to assist in troubleshooting; 2. If the column does not exist, the table structure should be confirmed and quotes or alias should be used correctly; 3. The null values of the aggregate function can be processed by COALESCE; 4. Multiple subqueries can be used instead to use the IN operator or LIMIT to limit the results.
Aug 01, 2025 am 07:18 AM
Use systemctlstatusnginx to check the Nginx service status to confirm whether it is running and powering on; 2. Master the core commands such as start, stop, restart, reload, enable, and disable, and give priority to using reload to avoid connection interruptions; 3. Use journalctl-unginx.service to view the logs, and the -f parameter can be monitored in real time to facilitate troubleshooting startup failures; 4. Be sure to run sudonginx-t test syntax before modifying the configuration to prevent reload failure; 5. If you need to customize the configuration, use sudosystemctleditnginx to create a secure overwrite file instead of direct
Aug 01, 2025 am 07:15 AM
To implement dynamic pricing using PaymentRequestAPI in H5 pages, the core is to dynamically generate paymentDetails objects based on user operations. The specific steps are as follows: 1. Listen to user operations, such as selecting the quantity of products, switching delivery methods, entering discount codes, etc.; 2. Calculate the total price in real time according to the rules, including discounts, taxes, freight, etc.; 3. Update the paymentDetails object to ensure that the latest amount is passed in; 4. Trigger the payment process when the user clicks the payment button, and verify the price again before calling show(). It is also recommended to synchronize the discount information with the backend, use the loading status to prevent repeated submissions, display confirmation pop-up window to check the information, and can be used in onshippi
Aug 01, 2025 am 07:14 AM
UsesemanticHTMLwithproperheadingsandstructuralelementstoenableassistivetechnologiestointerpretpagecontentcorrectly.2.Ensurekeyboardaccessibilitybymakingallinteractiveelementsfocusable,providingvisiblefocusindicators,managingfocusindynamiccomponents,a
Aug 01, 2025 am 07:14 AM
The key to realizing data ties in SQL databases is to clearly record and track the source and circulation paths of data through annotations, ETL logs, view dependencies and tool automation. 1. Use tables and fields to record source information, such as COMMENTONCOLUMN statements, and recommend unified formats for maintenance; 2. Add logging conversion paths in the ETL process to clarify the relationship between the source table and the target table, and support point-time tracking and error troubleshooting; 3. Use views to explicitly define query dependencies, encapsulate complex logic, and regularly extract dependencies to build a map; 4. Use open source or commercial tools such as OpenMetadata and ApacheAtlas to automatically analyze and display field-level blood ties to improve efficiency. These methods
Aug 01, 2025 am 07:13 AM
Vue3's Composition API organizes component logic in a functional way through setup() function or syntax, supports dividing code by function rather than options, improving maintainability and reusability; 1. Use ref() to create basic type responsive data, which needs to be accessed through .value; 2. Use reactive() to create responsive objects without .value; 3. Use computed() to define computed properties, watch() listens for specific data changes, and watchEffect() automatically tracks the side effects of dependency execution; 4. The life cycle hook is called in the setup through functions such as onMounted and onUpdated; 5. Syntax simplifies code, no
Aug 01, 2025 am 07:12 AM
:target pseudo-class implements specific style applications by matching the ID elements corresponding to the URL fragment identifier. When the user clicks on a link to the anchor, a fragment identifier similar to #section1 will appear in the URL. At this time, the element corresponding to the ID in the page will be applied to the:target style, such as highlighting. Common uses include: 1. Highlighted areas after navigation; 2. Create tabbed interfaces without JavaScript; 3. Add entry animations; 4. Improve accessibility. It can combine transitions, borders and other enhancements, but it should be noted that only IDs are supported and some old browsers may not be compatible with complex effects.
Aug 01, 2025 am 07:12 AM
MySQL connection pool is a "connection repository" that is used to efficiently manage database connections and avoid resource waste and performance bottlenecks. Its core function is to create connections in advance for programs to "borrow and return" to reduce the overhead of frequent connection establishment and destruction. Common configuration parameters include: 1. Max_connections; 2. Idle connection timeout time (idle_timeout); 3. Wait timeout time (wait_timeout); 4. Initial connection number (initial_size). When selecting a connection pool library, you can consider HikariCP, Druid, C3P0, etc. The usage steps include introducing dependencies, configuring parameters, initializing, obtaining and returning connections. Frequently asked questions about connection leaks
Aug 01, 2025 am 07:11 AM
Tomaximizeproductivitywithdualmonitors,firstchoosematchingmonitorsandpositionthemateyelevelwithalignedtopsandminimalbezelgaps,ideallyusingadualmonitorarmforbetterergonomics.Next,connectthemonitorsusingHDMI,DisplayPort,USB-C,orThunderbolt,thenonWindow
Aug 01, 2025 am 07:11 AM
Tags are used to display dynamic calculation results in forms, which are more semantic and assistive technology-friendly than divs. 1. It is often used in conjunction with the for attribute, pointing to the input box id participating in the calculation, enhancing structural logic; 2. Update content through textContent or innerHTML, but not submitted with the form; 3. The default style can be customized and requires JS to control updates. For example, when the total price is displayed in real time after the price and quantity is entered, maintainability and accessibility can be improved.
Aug 01, 2025 am 07:09 AM
Choosing the right MySQL data type can significantly improve performance. 1. The numerical type should be selected according to the value range and storage space. For example, TINYINT is suitable for the status field, and BIGINT avoids waste; 2. VARCHAR in the character type is suitable for content with large length changes, and CHAR is used for fixed length fields; 3. The time type DATETIME is suitable for large-scale time points, TIMESTAMP is suitable for time fields related to time zones and needs to be automatically updated, and DATE only has dates; 4. Large fields such as TEXT and BLOB should be used with caution to avoid affecting the sorting performance. It is recommended to split them into separate tables to optimize query efficiency.
Aug 01, 2025 am 07:08 AM
ToensureprecisioninfinancialcalculationsinPHP,usetheBCMathextensioninsteadoffloating-pointnumbers;1.Avoidfloatsduetoinherentroundingerrors,asseenin0.1 0.2yielding0.30000000000000004;2.UseBCMathfunctionslikebcadd,bcsub,bcmul,bcdiv,bccomp,andbcmodwiths
Aug 01, 2025 am 07:08 AM
WebPandAVIFoffersignificantlysmallerfilesizesandbettercompressionthanJPEGandPNG,withAVIFprovidingupto50%reductionoverJPEGandsupportforHDRandwidecolorgamut.2.UsetheelementtoserveAVIFwithWebPandJPEG/PNGfallbacksforbroadbrowsercompatibility.3.Automateim
Aug 01, 2025 am 07:08 AM
AsolidSQLdatabasebackupandrestorestrategyisessentialtopreventdatalossfromhardwarefailure,humanerror,orransomware.1)Understandbackuptypes:fullbackupscreateacompletecopy,differentialbackupscapturechangessincethelastfullbackup,andtransactionlogbackupsre
Aug 01, 2025 am 07:08 AM
When choosing monitor panel technology, different types of advantages and disadvantages should be weighed according to usage needs: 1. The IPS panel is accurate in color and has a wide viewing angle, which is suitable for design and office, but has a low contrast; 2. The VA panel has a high contrast and a deep black, which is suitable for audio and video entertainment and ordinary games, but has a slow response speed; 3. The TN panel is the fastest and has a low price, which is suitable for competitive games, but has poor color and visual angle performance. The final choice should be based on prioritization of color, contrast, response speed and budget to meet specific purpose needs.
Aug 01, 2025 am 07:06 AM
Strapioffersfullcontrolandcustomizationasaself-hosted,open-sourceCMS,allowingdeveloperstohostanywhere,modifyAPIs,addplugins,andcustomizetheadminpanel.2.Contentfulprovidesasmootherout-of-the-boxexperiencewithSaaSconvenience,includingbuilt-inCDN,real-t
Aug 01, 2025 am 07:05 AM
The core of LCP optimization is to shorten the time users see the main content of the page. 1. Improve TTFB through CDN, server cache and pre-connection; 2. Inline key CSS, asynchronously load non-critical resources and pre-load LCP elements; 3. Use WebP format, responsive images and lazy loading to optimize images; 4. Avoid layout offsets, optimize font loading, and use SSR/SSG to improve rendering speed; 5. Use Lighthouse and web-vitals libraries to continuously monitor performance, and ultimately achieve faster content presentation.
Aug 01, 2025 am 07:05 AM
TheFileAPIenablesclient-sidefilehandlinginJavaScriptbyallowinguserstoselectfilesandprocesstheminthebrowserwithoutserverinteraction.1)TheFileAPIincludesFile(filemetadata),FileList(listofselectedfiles),andFileReader(readsfilecontent).2)Filesaretypicall
Aug 01, 2025 am 07:04 AM
