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How to handle errors in a Vue application?

How to handle errors in a Vue application?

UseVue’serrorCapturedhookandapp.config.errorHandlertocatchcomponentandglobalerrors;2.Handleasyncerrorswithtry/catchinasyncmethodsandlistentounhandledrejectionevents;3.CreateerrorboundarycomponentsusingerrorCapturedtoisolateandmanageUIfailures;4.Integ

Jul 26, 2025 am 07:57 AM
vue Error handling
How to create and use a global event bus in Vue 3?

How to create and use a global event bus in Vue 3?

In Vue3, the global event bus needs to be implemented through third-party libraries or customizations. 1. Use mitt to create eventBus.js and export instances; 2. Import and use emit to send events in the component; 3. Use onMounted to listen for events in setup, and use off to clean the listener in onUnmounted; 4. It is recommended to use mitt because it is lightweight and reliable, avoids memory leaks and maintains application maintenance.

Jul 26, 2025 am 07:45 AM
event bus Vue 3
How to mock API calls when testing Vue components?

How to mock API calls when testing Vue components?

To test API calls in Vue components without requesting real interfaces, network dependencies must be avoided and test stability must be ensured by mocking the response. 1. If you use fetch, you can use the jest-fetch-mock library to enable and call mockResponseOnce in the setup file to simulate the return data; 2. If you use axios, you can simulate globally through jest.mock('axios'), or use vi.spyOn(axios,'get') to listen in Vitest and return preset values; 3. It is recommended to encapsulate the API logic into the service object, and inject mock service instances through provide/inject or props during testing, and to implement

Jul 26, 2025 am 07:27 AM
Where is the dist folder after Vue build?

Where is the dist folder after Vue build?

The dist folder generated after running npmrunbuild is located in the project root directory by default, and contains compiled HTML, JS, CSS and other deployment files. 1. The dist folder is generated in the project root directory by default; 2. The content includes index.html, js, css and possible img folders; 3. The output directory can be modified through vite.config.js or vue.config.js; 4. If the dist cannot be found, it may be a construction failure, a path error or the IDE is not refreshed; 5. Use the dist content directly during deployment without moving the folder.

Jul 26, 2025 am 06:55 AM
How to use ref and reactive in Vue 3 with script setup?

How to use ref and reactive in Vue 3 with script setup?

ref is suitable for basic types and independent values, and requires .value operations; reactive is suitable for objects and nested structures, and direct attribute operations. 1.ref is used in scenarios where basic types or cross-functional passes. 2. Reactive is used for objects or associated properties. 3. Pay attention to the loss of reactive split assignment. 4. Ref and reactive can be used in combination to flexibly handle complex scenarios.

Jul 26, 2025 am 06:21 AM
Combined API Vue 3
How to use Teleport in Vue 3?

How to use Teleport in Vue 3?

Teleport is a built-in component in Vue3 for rendering part of the template content to other locations in the DOM. 1. It specifies the target position through the to attribute, such as body or #modal-container; 2. It is often used to solve display problems caused by the parent element overflow or z-index, etc.; 3. Events and responsiveness still work normally despite the DOM position change; 4. It is necessary to ensure that the target element exists, otherwise the content will not be rendered; 5. Pay attention to accessibility when using, such as focus management and ARIA attributes, and ultimately achieve a flexible layout that is separated from the component level.

Jul 26, 2025 am 04:32 AM
How to use environment variables in a Vue project?

How to use environment variables in a Vue project?

Using environment variables in Vue projects can effectively manage configurations of different environments, and the answer is to define environment variables with specific prefixes and access them correctly. 1. In VueCLI, create files such as .env, .env.development, .env.production, etc., and the variables must start with VUE_APP_; in Vite, the variables must start with VITE_. 2. Accessed through process.env.VUE_APP_XXX in VueCLI, accessed through import.meta.env.VITE_XXX in Vite. 3. You can use --mode to specify the running mode to load the corresponding environment file. 4. Sensitive information should not be submitted to version control.

Jul 26, 2025 am 04:29 AM
How to handle a 404 Not Found page with Vue Router?

How to handle a 404 Not Found page with Vue Router?

Tohandle404pagesinVueRouter,defineacatch-allrouteusing/:pathMatch(.*)*asthelastrouteintheroutearraytocaptureanyunmatchedpaths.2.CreateadedicatedNotFoundcomponentwithauser-friendlymessageandalinkbackhome.3.ImportandregistertheNotFoundcomponentintherou

Jul 26, 2025 am 01:28 AM
404 page
Example of a dark mode toggle in a Vue app

Example of a dark mode toggle in a Vue app

The core steps in implementing the dark mode switching function in Vue applications are as follows: 1. Use data attributes to manage the theme state and implement style switching by binding class names; 2. Use localStorage to persist user preferences so that the settings will still take effect after page refresh; 3. Add dark classes to html or body to define dark theme styles in CSS; 4. It is recommended to use Vuex to manage global theme state in large projects to improve maintainability. These steps correspond to advanced applications of basic implementation, state persistence, style control and state management, ensuring that darkmode functions are complete and experience is consistent.

Jul 26, 2025 am 12:48 AM
vue Dark Mode
How to build a draggable list in Vue?

How to build a draggable list in Vue?

Implementing drag-and-drop lists in Vue can be done through HTML5 drag-and-drop API or third-party libraries. 1. When using native API, add draggable attributes and dragstart, dragover, drop events to the list items, record indexes in dragstart, block default behavior in dragover, and exchange positions in drop; 2. Combining Vue responsive data, use the splice method to update the array order to trigger view refresh; 3. You can optionally use vuedraggable and other libraries to simplify development, and use v-model to bind data to achieve drag and drop sorting, improve efficiency and support complex functions.

Jul 25, 2025 am 03:53 AM
vue
How do you handle form submission and validation in Vue?

How do you handle form submission and validation in Vue?

TohandleformsubmissionandvalidationinVue,useVue’sreactivitysystemwitheventhandlinganddatabinding.1.Use@submit.preventtocaptureformsubmissionandpreventdefaultbehavior.2.Handlesubmissionlogicinamethodorfunction.3.Forvalidation,performinlinechecksmanual

Jul 25, 2025 am 03:42 AM
What is a single file component (SFC)?

What is a single file component (SFC)?

ASingleFileComponent(SFC)inVue.jscombinestemplate,script,andstyleintoone.vuefileforbetterorganization.1.ThesectiondefinestheHTMLstructure.2.Thesectioncontainsthecomponent’slogicanddata.3.ThesectionincludesscopedCSStopreventglobalconflicts.SFCsimprove

Jul 25, 2025 am 03:40 AM
How do you handle assets like images and fonts in a Vue CLI project?

How do you handle assets like images and fonts in a Vue CLI project?

In the VueCLI project, the key to dealing with static resources is to distinguish the uses and reference methods of the public and src/assets directories. 1. The public/ directory is used to store resources that do not require webpack processing, such as third-party fonts or robots.txt, which are copied directly to the output directory, and the access path is the root path; 2. The resources under the src/assets/ directory will be processed by webpack, such as compression and hash, which is suitable for project icons and pictures; 3. When referring pictures in components, use relative paths or alias (such as @/assets/logo.png) to automatically process, and dynamic paths must be ensured; 4. Reference images in CSS need to add ~ to represent module paths, such as

Jul 25, 2025 am 03:38 AM
How to define props with TypeScript in Vue?

How to define props with TypeScript in Vue?

ForcompositionApiwith, UsedefinePloT () TodefinetypedPlop, WheroPtionalPropprophare Markedwith?, Anddefaultvaluesaresetusingwithdefa ULTS (); 2.inoptionsapi, ImportProptypehandfinePropswith type: ObjectasPropTypeToensuretypescript Understarian Type; 3. Simpleca

Jul 25, 2025 am 03:31 AM

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