After following, you can keep track of his dynamic information in a timely manner
JWTisasecuretokenformatforauthentication,consistingofheader,payload,andsignature;2.SetupNode.jswithExpress,jsonwebtoken,bcryptjs,body-parser,anddotenv;3.Createaserverwithuserregistration,passwordhashing,andlogintogenerateJWT;4.Implementtokenverificat
Aug 01, 2025 am 05:59 AM
CSSCustomProperties (CSS variables) are native, dynamic and JavaScript-operable style values that replace duplicate CSS values and implement topic switching, component isolation, and responsive design. 1. Declare global variables defined in:root (such as --primary-color:#3498db), and call them with the var() function (such as background-color:var(--primary-color)); 2. Support cascade and inheritance, and can be overwritten in component or media queries (such as @media to modify --gap); 3. Dynamic updates can be made through JavaScript (such as document.doc
Aug 01, 2025 am 05:58 AM
The method of installing Vuex is divided into three types according to the project type: 1. For Vue2 projects, use npm or yarn to install vuex@3, and introduce and mount store in main.js; 2. For Vue3 projects, it is recommended to use Pinia instead, and create and mount Pinia instances after installation; 3. For simple projects without build tools, Vuex can be introduced through CDN, but it is not recommended to be used in production environments. After selecting the appropriate method, follow the steps to complete the installation and configuration.
Aug 01, 2025 am 05:58 AM
HashMap is implemented in Java through array linked lists/red and black trees. Its performance is affected by the initial capacity, load factor, hash function quality and the immutability of the keys; 1. Use (n-1)&hash to calculate the index to improve efficiency; 2. When the linked list length exceeds 8 and the number of buckets is ≥64, it will be converted to a red and black tree, so that the worst search complexity is reduced from O(n) to O(logn); 3. Rehash all elements when expanding, the overhead is high, and the capacity should be preset; 4. The key must be rewrite hashCode and equals correctly; 5. ConcurrentHashMap should be used in multi-threaded scenarios; the average time complexity is O(1) under reasonable use, but improper use will lead to performance degradation.
Aug 01, 2025 am 05:54 AM
DependencyInjection(DI)isadesignpatternwhereobjectsreceivedependenciesexternally,promotingloosecouplingandeasiertestingthroughconstructor,setter,orfieldinjection.2.SpringFrameworkusesannotationslike@Component,@Service,and@AutowiredwithJava-basedconfi
Aug 01, 2025 am 05:53 AM
FUNCTION returns the name of the current function or method, and does not contain the class name; 2. When METHOD is used in a method, it will return the format of "class name:: method name", which contains the context information of the class; 3. The two behave the same in independent functions; 4. When debugging object-oriented code, it is recommended to use METHOD to obtain more complete call information; 5. If you need complete namespace information, you need to combine get_class($this) or reflection mechanism. Therefore, the choice depends on the level of detail of the desired context.
Aug 01, 2025 am 05:49 AM
Common Python design patterns include singleton mode, factory method mode, observer mode, and policy mode. These patterns are suitable for scenarios where the system is extensible, logically abstractable and decoupled, such as plug-in systems using policy patterns to replace behavior, and configuration management uses singleton patterns to avoid duplicate instances. When using it, avoid over-design, start with a simple implementation, weigh complexity and flexibility, and make good use of Python features such as decorators, data classes and ABC modules to simplify implementation.
Aug 01, 2025 am 05:48 AM
Mastering SQL query skills can improve supply chain management efficiency, including querying inventory status, tracking order execution, analyzing supply cycles and monitoring inventory turnover rates. ① Implement inventory monitoring by summarizing inventory quantity and filtering insufficient inventory; ② Calculate order delivery cycle by correlating orders, shipments and supplier tables; ③ Identify supplier efficiency bottlenecks by calculating the average procurement cycle; ④ Evaluate inventory capital utilization rate through the inventory turnover rate formula. These methods contribute to data-driven supply chain optimization.
Aug 01, 2025 am 05:47 AM
Penetration testing and security research using Python can be achieved through the following steps: 1. Use the socket module to write a port scanner, combine multi-threading to improve efficiency and set a timeout mechanism; 2. Use the scapy and pyshark library to perform packet sniffing and analysis, monitor network traffic to identify HTTP requests; 3. Use the requests library to automatically detect vulnerabilities, such as checking whether common background paths exist. Python is mainly used in automated tasks, process optimization and tool development in this process. Mastering key libraries such as sockets, requests, and scapy can greatly improve security detection efficiency.
Aug 01, 2025 am 05:46 AM
GraphQLfragmentsshouldbeusedtoavoidrepeatingfieldsinqueries,improvemaintainability,andenablemodularcode.1.DefinereusablefieldselectionslikefragmentUserFieldsonUser{idnameemailavatar}toeliminateduplication.2.Use...UserFieldsinanyqueryreturningUsertoce
Aug 01, 2025 am 05:44 AM
IIS's applicationHost.config file is the core of server configuration and determines the behavior of the site, application pool and module. It is located in the %windir%\system32\inetsrv\config directory, and is in XML format, including key parts such as, and. 1. In the process, through and configure the site and application pool, ensure that the site is bound to the correct application pool; 2. Pay attention to syntax correctness when modifying to avoid causing IIS startup failure; 3. Common troubleshooting points include binding information, physical path permissions, application pool status and ID conflicts; 4. Files should be backed up before editing and operated as an administrator. It is recommended to deploy to the production environment after verification of the test environment. Master the file structure:
Aug 01, 2025 am 05:42 AM
In the Laravel project, the .env file is used to manage environment variables and improve security and maintainability. To load .env files correctly, Laravel will automatically read by default, but in some server environments, you need to run the phpartisanconfig:clear and phpartisanconfig:cache commands to ensure that variables are cached correctly; configurations suitable for .env include database connections, API keys, application switches and third-party service configurations; when using it, you should pay attention to the default variable types as strings, avoid repeated definitions, preferential use of config() instead of env(), and support multi-environment configuration through .env.testing and other files, while avoiding sensitivity
Aug 01, 2025 am 05:42 AM
JavaScript's event loop ensures that asynchronous operations are executed in an orderly manner. The answer is: 1. Synchronous code is executed first; 2. Asynchronous tasks are processed by WebAPI and entered into the corresponding queue; 3. The event loop prioritizes the micro-task queue and then executes macro tasks. Therefore, the code first outputs synchronous content, then executes micro-tasks such as Promise.then, and finally handles macro-tasks such as setTimeout, forming a specific output sequence, and the complete process continues to schedule the tasks in a closed-loop manner until they are finished.
Aug 01, 2025 am 05:41 AM
TobuildaLinuxhomemediaserver,chooseasuitabledistrolikeUbuntuServerorOpenMediaVault;setupstoragebyattachingandformattingdrives,mountingthemvia/etc/fstab,andenablingnetworksharingusingSambaorNFS;installamediastreamingserversuchasPlex,Jellyfin,orEmby—in
Aug 01, 2025 am 05:40 AM
TomanageLinuxserviceseffectively,usesystemctlwithsystemd.1.Startaserviceimmediatelywithsudosystemctlstartnginx.service.2.Stopitwithsudosystemctlstopnginx.service.3.Restartusingsudosystemctlrestartnginx.service.4.Reloadconfigurationwithoutrestartviasu
Aug 01, 2025 am 05:39 AM
The combination of Turborepo and pnpm is the preferred solution for modern JavaScript and TypeScript monolithic warehouses, because it provides quick installation, reliable dependency resolution, shared cache, parallel task execution and excellent tool support; first initialize the project and create pnpm-workspace.yaml to define the workspace structure, then install Turborepo as development dependency, then configure turbo.json to define the build pipeline, then set up an independent package.json for each package and use pnpm's workspace protocol to reference the local package. Finally, run the build, test and development tasks through the pnpmturbo command. It is also recommended to enable pnpm's
Aug 01, 2025 am 05:37 AM
Singleton mode is suitable for scenarios where globally unique instances are needed, such as configuration management, log services, cache layer and simple state management; 2. Singletons can be implemented through IIFE or ES6 modules in JavaScript, which naturally have singleton characteristics due to module cache; 3. Avoid using singletons for simple global convenience, because it is easy to lead to tight coupling, hidden dependencies, testing difficulties and violation of single responsibility principles; 4. Prioritize clearer and more measurable alternatives such as stateless tool functions, dependency injection or ES6 module export; 5. Only use singletons when sharing state or coordinated behavior is really needed, rather than just to centrally store data, global state is a global risk.
Aug 01, 2025 am 05:35 AM
To perform performance analysis of Go code in the container, you must first enable pprof and expose the port, and then collect data through gotoolpprof. The specific steps are: 1. Import the net/http/pprof package in the Go application and start the HTTP server to expose the debugging interface; 2. Open the 6060 port through the EXPOSE and -p parameters in the container configuration, or use port-forward in Kubernetes; 3. Use gotoolpprof http://localhost:6060/debug/pprof/profile and other commands on the host to obtain performance data such as CPU, heap memory or goroutine; 4. Optionally,
Aug 01, 2025 am 05:31 AM
JWTauthenticationinGoisimplementedbygeneratingsignedtokensuponlogin,validatingthemviamiddleware,andfollowingsecuritybestpractices.1.Usethegolang-jwt/jwtlibrarytohandletokencreationandparsing.2.Generatetokenswithsecureclaimslikeexpandiataftersuccessfu
Aug 01, 2025 am 05:28 AM
Mavenisidealforstandardized,enterpriseenvironmentswithitsXML-based,convention-over-configurationapproach,while2.GradleexcelsinflexibilityandperformanceusingGroovyorKotlinDSL,makingitbetterforcomplex,large-scale,orAndroidprojects,3.bothsupportrobustde
Aug 01, 2025 am 05:25 AM
CodesplittingimprovesJavaScriptapplicationperformancebyreducinginitialbundlesize;itworksbysplittingcodeintosmallerchunksloadedondemand,leadingtofasterinitialload,bettercaching,andimproveduserexperience.Thethreemaintypesare:1.Route-BasedSplitting–load
Aug 01, 2025 am 05:18 AM
1. When designing joint indexes, fields with high equal value matching and distinction should be placed in front of the field, and after the range query field should be placed; 2. Use overlay indexes to avoid table back operations and reduce I/O overhead; 3. Sorting and grouping should ensure that the index order and direction are consistent to avoid filesort; 4. Regularly clean useless indexes and avoid duplicate indexes, and reasonably evaluate the comprehensive impact of indexes on query and writing. For complex query scenarios, the index structure should be optimized in combination with execution plan analysis, rather than blindly adding indexes.
Aug 01, 2025 am 05:18 AM
SQL security vulnerabilities mainly include SQL injection, unsafe configuration, improper permission management and missing logs. The prevention measures are: use parameterized query, strict input verification, and minimum permission principles; restrict access to IP, modify default accounts, and regularly update versions; allocate permissions for independent accounts, manage by role, and regularly audit permissions; enable audit logs, centralized storage, and set alarms.
Aug 01, 2025 am 05:17 AM
Choosing the right garbage collector and configuring it properly is the key to optimizing Java application performance. First, select the GC type according to application needs: SerialGC is used for small memory applications, ParallelGC is used for high throughput scenarios, G1GC is used for large memory and controllable pauses, and ZGC is used for ultra-low latency requirements (such as financial transactions). 1. Set the heap size reasonably to avoid being too large or too small. It is recommended that -Xms and -Xmx are equal to -Xmx to prevent dynamic expansion; 2. For G1GC, you can set the target pause time through -XX:MaxGCPauseMillis, adjust -XX:G1HeapRegionSize to deal with large objects, and use -XX:InitiatingHea
Aug 01, 2025 am 05:12 AM
MySQLCluster is more suitable for high concurrency and low latency scenarios, and uses a distributed architecture to support data sharding and fast failover; GroupReplication emphasizes data consistency, which is suitable for scenarios with high consistency requirements, and realizes multi-node synchronous replication based on Paxos. 1.MySQLCluster adopts shared-nothing architecture, supports automatic sharding and online expansion, which is suitable for telecommunications and real-time billing systems; 2. Each node of GroupReplication saves complete data, guarantees consistency through majority consensus, and is suitable for financial transaction systems; 3.Customization is checked before submission, and quickly selects the master when a failure is made, Clust
Aug 01, 2025 am 05:09 AM
VirtualthreadsinJava—introducedaspartofProjectLoom—areagame-changerforwritinghigh-throughput,concurrentapplicationswithouttheusualcomplexityofasyncprogrammingorthreadpooling.Ifyou’veeverstruggledwithblockingI/Ooperationss
Aug 01, 2025 am 05:03 AM
Using while and fgets() can efficiently process large files because this method reads line by line to avoid memory overflow; 1. Open the file and check whether the handle is valid; 2. Use while loops to combine fgets() to read line by line; 3. Process each line of data, such as filtering, searching or conversion; 4. Use trim() to remove whitespace characters; 5. Close the file handle in time; 6. Customize the buffer size to optimize performance; compared with file() loading the entire file at one time, this method has low memory usage, stable performance, and supports super-large file processing. It is suitable for log analysis, data migration and other scenarios. It is a recommended way to safely process large files.
Aug 01, 2025 am 05:02 AM
NextAuth.js is the authentication library of Next.js, which supports OAuth, email password, JWT, etc.; 2. After installation, configure the provider and key in pages/api/auth/[...nextauth].js; 3. Use SessionProvider to wrap the application and use useSession, signIn, signOut to manage the status; 4. Use getSession or getServerSession to protect pages and API routes; 5. You can add Credentials providers to realize mailbox password login and cooperate with JWT policy; 6. You can customize the login page and expand user information through callbacks; NextA
Aug 01, 2025 am 05:00 AM
MemoryleaksinNode.jsarecausedbyaccidentalglobalvariables,unclosedeventlisteners,closuresretainingobjects,unboundedcaching,andtimersholdingreferences.2.Monitormemoryusingprocess.memoryUsage()ortoolslikepm2monittodetectcontinuousheapgrowth.3.Generatehe
Aug 01, 2025 am 04:59 AM
Trees and graphs can be implemented in JavaScript through objects and references; 2. Tree structures such as TreeNode class support addChild, removeChild and DFS traversal; 3. Binary search tree (BST) realizes efficient search, insertion and in-order traversal through small left and large left rules; 4. Graphs are represented by adjacency tables (Map Sets), supporting the addition of vertices and edges, BFS and DFS traversal; 5. Practical suggestions include using Set to avoid duplicate edges, iteratively avoid stack overflow, and selecting BFS or DFS according to the scene, which can ultimately be expanded to weighted graphs or algorithm applications.
Aug 01, 2025 am 04:55 AM
