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How to define props with TypeScript in Vue?

How to define props with TypeScript in Vue?

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Jul 25, 2025 am 03:31 AM
What is the difference between v-if and v-show in Vue?

What is the difference between v-if and v-show in Vue?

v-if and v-show are used for conditional rendering in Vue.js, but the mechanism is different. 1. v-if determines whether to insert or remove the DOM according to the conditions, which is suitable for scenarios where there is infrequent switching; 2. v-show is always retained in the DOM, and only controls visibility through the CSSdisplay attribute, which is suitable for frequent switching; 3. Use v-if to save memory, while v-show provides smoother switching performance; 4. v-if is suitable for large chunks of content or delayed loading, v-show is suitable for interactions that need to retain state; 5. v-if can be used in it, but v-show is incompatible. The initial rendering cost and switching efficiency should be weighed when choosing.

Jul 25, 2025 am 03:31 AM
vue
Creating a custom directive in Vue 3 example

Creating a custom directive in Vue 3 example

Creating custom instructions in Vue3 requires registration through application instance or component options, and using the life cycle hook to operate the DOM. 1. Use app.directive() for global registration, and use directives option for local registration. 2. Commonly used life cycle hooks include mounted and unmounted, which are suitable for handling DOM-related logic. 3. The parameter instruction can obtain the value through binding.value and update it in mounted and updated. 4. Be careful to avoid damaging the responsive mechanism, operate the DOM only when necessary, and clean up resources in unmounted.

Jul 25, 2025 am 03:26 AM
How to communicate between sibling components?

How to communicate between sibling components?

In React, sibling component communication can be implemented by promoting state to parent component and passing props. 1. The parent component maintains the shared state and passes it as a prop to the child component; 2. At the same time, passes the method of modifying the state to the child component that needs to change the data; 3. When the state changes, all child components that rely on the state will be updated synchronously. In addition, Context can also be used to pass data across levels or introduce global state management tools such as Redux and Zustand to achieve more complex communication needs.

Jul 25, 2025 am 03:22 AM
How to reduce Vue build size?

How to reduce Vue build size?

The core methods for optimizing the package volume of Vue project are: 1. Use webpack-bundle-analyzer to analyze the package volume composition; 2. Split dependencies and load components and routes on demand; 3. Enable Gzip compression to reduce transmission size; 4. Introduce large libraries through CDN. Specific operations include installing the analysis plug-in to view the module size, configuring babel-plugin-component and asynchronous routing to achieve on-demand loading, using the compression-webpack-plugin plug-in to generate .gz files, and setting externals in vue.config.js to exclude libraries introduced by CDN, thereby significantly improving page loading speed and user experience.

Jul 25, 2025 am 02:36 AM
How to use mapState helper?

How to use mapState helper?

Use mapState helper function to simplify the mapping process of state in Vuex. 1. When mapping the same name, just pass the state name through an array; 2. When alias is needed, use the object form to specify the correspondence between the old and new names; 3. You can coexist with other computed attributes with expansion operators; 4. Note that it is only used to map state, and the modular store must have a path, and the alias should be used with caution to avoid confusion.

Jul 25, 2025 am 02:31 AM
How to use async components in Vue 3?

How to use async components in Vue 3?

Using asynchronous components in Vue3 optimizes performance for non-first-screen or heavier components. 1. Use the defineAsyncComponent method to define asynchronous components to achieve loading on demand; 2. You can configure loadingComponent, errorComponent, delay and timeout to handle loading status and errors; 3. You can also use dynamic imports to achieve lazy loading in the route; 4. Pay attention to the rational use of asynchronous components to avoid affecting the performance of the first screen, and combine preloading and code segmentation strategies to improve the experience.

Jul 25, 2025 am 01:29 AM
How to use mapMutations helper?

How to use mapMutations helper?

mapMutations is a helper function of Vuex that maps mutations in the store to methods within the component, thereby simplifying the way to call. It allows you to trigger mutation via this.increment() instead of this.$store.commit('increment'), keeping the code simple and easy to maintain. When using it, you need to import it from vuex and introduce it in component methods through array form (name consistent) or object form (rename rename), for example: ...mapMutations(['increment','decrement']) or ...mapMutations({a

Jul 25, 2025 am 12:57 AM
How to lazy load routes with Vue Router?

How to lazy load routes with Vue Router?

Use dynamic import (import()) to implement lazy loading of VueRouter, thereby improving application performance. 1. Change the routing component to the form of ()=>import('@/views/Component.vue'), triggering code segmentation; 2. Construction tools (such as Webpack or Vite) will generate independent JS code blocks for each lazy loading component, which are only loaded when accessing the corresponding route; 3. The code blocks can be named through /webpackChunkName: "name"/ to optimize cache and readability; 4. Be careful to avoid overuse of lazy loading for layout or small shared components, and manually handle the loading state as needed. After correct configuration

Jul 25, 2025 am 12:23 AM
How to define a reactive object with nested properties?

How to define a reactive object with nested properties?

The most direct way to define nested responsive objects in Vue.js is to use reactive(), which can automatically handle the responsiveness of all nested properties; 1. Use reactive() to turn the entire object and nested properties into responsiveness, but new properties need to be Vue.set() or reassigned to maintain responsiveness; 2. Refs are available when you need to control deep attributes separately, but the operation complexity of .value will be increased; 3. Avoid mixing reactive and refs. ToRefs() should be used during deconstruction to maintain responsiveness, and array modifications need to trigger updates through mutation methods.

Jul 25, 2025 am 12:09 AM
Example of a custom event modifier in Vue

Example of a custom event modifier in Vue

Custom event modifiers cannot be created directly in Vue, but they can be simulated by encapsulating $emit, using custom directives, or component logic. 1. By encapsulating $emit in the child component and passing additional parameters, behavior similar to modifiers can be simulated; 2. Using custom instructions to achieve global event logic control, such as throttling or anti-shake; 3. For form components, preprocessing logic for event processing can be implemented by combining modelValue and $emit, thereby achieving modifier-like effects. Although these methods are not officially supported modifier mechanisms, they can effectively meet specific needs.

Jul 24, 2025 am 03:40 AM
php java programming
How to migrate a Vue project from Vue CLI to Vite?

How to migrate a Vue project from Vue CLI to Vite?

The key steps to migrate VueCLI projects to Vite are as follows: 1. Install Vite and necessary plug-ins, including vite and @vitejs/plugin-vue. If you use JSX, TS, etc., you also need to install the corresponding plug-ins; 2. Create or modify the index.html file as a new entry, and ensure that main.js is initialized using createApp; 3. Add the vite.config.js configuration file and integrate the vue plug-in and optional configurations such as alias and ports; 4. Replace the startup script in package.json as a Vite command; pay attention to plug-in compatibility, static resource paths, environment variable naming rules, and TypeScript configuration when migrating.

Jul 24, 2025 am 03:38 AM
vue vite
What are slots in Vue?

What are slots in Vue?

The default slot is used to insert a single content, and the content passed by the parent component will be directly filled in the location of the child component; 2. The named slot implements multiple insertion points through the name attribute and v-slot instructions, so that the content can be inserted into different areas of the child component; 3. The scope slot allows the child component to pass data to the parent component through the slot prop. The parent component can custom render content based on this data, thereby achieving logical separation from display. Slots are the core mechanism in Vue to realize content distribution and flexible reuse of components.

Jul 24, 2025 am 03:37 AM
vue Slots
How to emit custom events from a child component?

How to emit custom events from a child component?

The most common way for child components to pass information to parent components is through custom events. Use the $emit method to trigger a custom event, for example, clicking a button in a child component triggers this.$emit('child-event'), the parent component listens to the event and executes the corresponding method; when passing data, it can be passed through parameters, such as this.$emit('user-selected',123), and the parent component's method receives parameters for processing; it is recommended to use kebab-case for event naming, be careful to avoid abuse of $emit, deep nesting or sibling component communication should use Vuex or EventBus.

Jul 24, 2025 am 03:36 AM

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