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How to use mixins for reusable functionality in Vue

How to use mixins for reusable functionality in Vue

MixinsinVue.jsarereusableobjectscontainingcomponentoptionslikemethods,data,andlifecyclehooksthatcanbesharedacrosscomponents.2.Touseamixin,defineitasaJavaScriptobjectandincludeitinthecomponent’smixinsarray,whereoptionsaremerged—componentdataoverridesm

Aug 04, 2025 am 01:09 AM
vue mixins
How to handle reactive state changes in nested objects in Vue?

How to handle reactive state changes in nested objects in Vue?

In Vue3, nested objects are responsive by default and can be modified directly; in Vue2, new or deep nested properties will not respond automatically, so you need to use this.$set() or replace the entire object. 1. Vue3 uses Proxy to implement deep responsiveness, and both reactive() and ref() support direct nested updates; 2. Vue2 needs to add new attributes through Vue.set(); 3. Replace the parent object to trigger responses; 4. Predefined all nested fields during initialization; 5. It is recommended to use Pinia or Vuex to manage complex states. Therefore, correctly handling version differences and structured data in advance avoids responsiveness issues.

Aug 03, 2025 am 10:13 AM
How to write a unit test for a Vue component that uses Vuex?

How to write a unit test for a Vue component that uses Vuex?

Create a test-specific Vuexstore and initialize it with createStore; 2. Inject store through mount's global.plugins; 3. Use jest.fn() to simulate actions to verify calls; 4. Test the responsiveness of the component when the store state changes; 5. Optionally mock the store partially or use @testing-library/vue; finally implement isolated and reliable unit testing to ensure that the component interacts correctly with Vuex, the test is complete and maintainable.

Aug 03, 2025 am 10:12 AM
What is Vite and why is it becoming a popular choice for Vue projects?

What is Vite and why is it becoming a popular choice for Vue projects?

Viteisamodernfront-endbuildtoolthatprovidesfasterdevelopmentbyleveragingnativeESmodules,resultinginnear-instantserverstartandfastHMR;1.ItservesfilesdirectlyviabrowserESM,eliminatingfullbundlingduringdevelopment.2.Itusesesbuildforfastdependencypre-bun

Aug 03, 2025 am 10:03 AM
What is the difference between ref() and reactive() in Vue 3?

What is the difference between ref() and reactive() in Vue 3?

InVue3,ref()isbestforprimitivesandstandalonevalues,whilereactive()suitsobjectsandnestedstructures.Useref()whentrackingasinglevaluelikeanumberorboolean,andaccessitvia.value.Usereactive()tomakeentireobjectsreactivewithout.value.Refpreservesreactivitywh

Aug 03, 2025 am 09:39 AM
How to handle content security policy (CSP) in a Vue SPA?

How to handle content security policy (CSP) in a Vue SPA?

AvoidinlinescriptsandstylesbymovingallJavaScripttoexternalfilesandusingVue’seventhandlersinsteadofinlineonclickattributes.2.UseastrictCSPheaderwithout'unsafe-inline'or'unsafe-eval'byadoptingVue’sruntime-onlybuildandSingleFileComponentstoeliminatethen

Aug 03, 2025 am 08:56 AM
How to deploy a Vue application to Netlify or Vercel?

How to deploy a Vue application to Netlify or Vercel?

The steps to deploy Vue to Netlify or Vercel are as follows: 1. Run npmrunbuild to generate static files; 2. Push the code to GitHub and other Git repositories; 3. Log in to Netlify or Vercel and create a new project; 4. Connect to the code repository; 5. Configure the build command to npmrunbuild and the output directory is dist; 6. Click to deploy and get the generated URL. Both support setting environment variables through the dashboard and rewriting rules to support history mode routing and custom domain names. After the deployment is completed, you can access the online address.

Aug 03, 2025 am 08:53 AM
How to build a reusable modal component in Vue?

How to build a reusable modal component in Vue?

Create a reusable Vue modal box component, first define Modal.vue as the base container, including mask layer, title, content and bottom slots; 2. Use slots to achieve flexibility, customize content through header, default and footer slots; 3. Control display and hide through v-model:isOpen binding in the parent component to achieve two-way communication; 4. Optional enhancements include adding transition animation, ESC key closing, focus locking and customization class names; finally obtaining a reusable, customizable and barrier-free modal box component, suitable for the entire application range.

Aug 03, 2025 am 07:15 AM
What are the main benefits of using Nuxt.js over standard Vue SSR?

What are the main benefits of using Nuxt.js over standard Vue SSR?

Nuxt.jssimplifiessetupwithfile-basedrouting,automaticcodesplitting,andpre-configuredtools,eliminatingtheneedformanualWebpackandVueRouterconfigurationrequiredinstandardVueSSR.2.ItsupportsSSR,SSG,andhybridrenderingoutofthebox,enablingflexibledeployment

Aug 03, 2025 am 06:47 AM
How to fetch data from an API in a Vue component

How to fetch data from an API in a Vue component

When using Composition API, manage data, loading and error status through ref in onMounted, and initiate requests with fetch or axios; 2. When using Options API, handle asynchronous requests and update data, loading, and error in mounted hooks; 3. It is recommended to use axios for more powerful error handling and request configuration; 4. Always manage loading and error status, avoid direct requests in created or setup, and prioritize execution in onMounted or mounted to support SSR; 5. Incomplex scenarios, unfinished requests should be canceled to prevent memory leaks; 6. Save API addresses in

Aug 03, 2025 am 05:21 AM
How to use v-once for performance optimization in Vue?

How to use v-once for performance optimization in Vue?

Use v-once to improve performance when content does not require responsive updates. It allows elements or components to render only once, and subsequent updates skip re-rendering, which is suitable for static content, list items, or expensive components; using v-once in static parts, unchanged lists or complex static structures in dynamic components can reduce dependency tracking, speed up re-rendering and save memory, but it is necessary to avoid using content that may change. Especially when combined with v-for, you should ensure that the data is truly static, and excessive use may increase debugging difficulty.

Aug 03, 2025 am 04:13 AM
What is the difference between a method and a computed property in Vue

What is the difference between a method and a computed property in Vue

Methodsruneverytimetheyarecalled,includingoneachre-render,whilecomputedpropertiesarecachedandonlyre-evaluatewhentheirreactivedependencieschange.2.Methodsdonotcacheresults,sooperationslikestringreversalrunafresheachtime,whereascomputedpropertiesreturn

Aug 03, 2025 am 04:07 AM
How to handle conditional rendering in Vue

How to handle conditional rendering in Vue

Vue provides v-if, v-else-if, v-else and v-show to handle conditional rendering; 1. Use v-if, v-else-if and v-else to control element rendering based on the true and false values of the expression. v-if is the initial condition, v-else-if is used for multi-condition judgment, v-else is placed last without expression, these instructions must be used continuously on the same level elements; 2. v-show switches element visibility through the display attribute of CSS, and elements always exist in the DOM, suitable for frequent switching scenarios; 3. The core difference between v-if and v-show is that v-if lazy rendering, switching overhead is high but is conducive to initial performance, v-show always renders and cuts

Aug 03, 2025 am 04:04 AM
vue.js Conditional rendering
What is the difference between v-bind and v-model in Vue

What is the difference between v-bind and v-model in Vue

v-bind is used for one-way data binding, passing data from the parent component to the child component, the syntax is: prop or v-bind:prop, which is suitable for property binding and transmission of props, but user input will not automatically update data; 2. v-model implements two-way data binding, which not only displays data but also automatically updates data when user inputs. It is often used for form elements, equivalent to v-bind:value combined with v-on:input, and supports custom components to achieve synchronization through modelValue and update:modelValue; therefore, v-bind is suitable for one-way data flow scenarios, and v-model is suitable for form input scenarios that require automatic bidirectional synchronization. The two are not interchangeable, v-

Aug 03, 2025 am 02:47 AM
vue v-model v-bind

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