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How to create custom instructions in vue

Use the Vue.directive() method to create a custom directive in Vue. The directive name starts with the v- prefix. The directive options include life cycle hooks such as bind, inserted, update, componentUpdated, and unbind, which are used to operate DOM elements at different stages. Parameters can be accepted. Add a colon (: parameter name) after the command name to specify the parameters.

Apr 27, 2024 pm 11:33 PM

vue

In what form does the page structure exist in Vue?

Page structure exists in the form of components in Vue. Components are reusable blocks of code that define specific elements or areas on the page, including local components (defined within a single Vue file) and global components (defined outside a Vue instance).

Apr 27, 2024 pm 11:33 PM

vue

The role of computed in vue

Computed properties in Vue.js are used to dynamically calculate values for caching, responsiveness, readability, optimized rendering performance, and simplified templates. It relies on the values of other properties for calculations and automatically updates when dependencies change, optimizing performance and simplifying code.

Apr 27, 2024 pm 11:33 PM

vue

The instruction to implement two-way data binding in vue is

The directive that implements two-way data binding in Vue is v-model. It implements binding by updating data properties and input controls. Usage: 1. Define a data attribute to store the input value. 2. Apply v-model to the input control. Advantages: Simplify data binding, improve development efficiency, and improve user experience.

Apr 27, 2024 pm 11:30 PM

vue

The function and principle of key in vue

The role of key in Vue is to track the unique identity of list elements to optimize update performance and ensure correct deletion. The principle is to use key as an identifier in the virtual DOM node and compare the old and new keys to update only the elements that have changed, or delete elements with different keys. Best practices include giving each element a unique key, using stable values (such as IDs), and avoiding indexes.

Apr 27, 2024 pm 11:30 PM

vue

The instruction for attribute binding in vue is

The attribute binding directive in Vue is v-bind, which allows dynamic binding of Vue data to HTML attributes. It is used as follows: use v-bind:attributename="expression", where attributename is the attribute name and expression is the JavaScript expression of data. Can be abbreviated to :attributename="expression". Note that the camelCase attribute needs to be converted to hyphenated form.

Apr 27, 2024 pm 11:30 PM

vue

How does Vue use the interface provided by the backend?

Using the backend interface in Vue can be achieved by following these steps: Install the Axios library and import it. Use the axios object to create HTTP requests such as get or post. Use the data option to pass data. To handle the response, use the data attribute to access the data returned by the backend. Use Vuex to manage data fetched from the backend, accessed through components.

Apr 06, 2024 am 02:09 AM

vue

How to set Chinese in vue

Setting the Chinese language in Vue.js requires: 1. Installing the VueI18n plug-in; 2. Creating a language file; 3. Configuring VueI18n in main.js; 4. Using the $t() method to obtain the translation string.

Apr 06, 2024 am 02:06 AM

vue

How to implement the add, delete, modify and check functions in Vue

Implement the add, delete, modify, and query function in Vue.js: Create: Use v-model to bind data and send a POST request to the server to create a new record. Read: Send a GET request to the server to obtain data. Update: Use v-model to edit data and send a PUT request to the server to update the record. Delete: Send a DELETE request to the server to delete the record.

Apr 06, 2024 am 02:03 AM

vue

How to download files in vue

There are two main ways to download a file: using the window.open() method: create a hidden tag, set the download properties, and click on it to trigger the download. Use third-party libraries: such as Vue File Download, Vue Download, Vue-Downloader, etc. These libraries provide an easier way to download files.

Apr 06, 2024 am 02:00 AM

vue

How to use vue framework

How to use the Vue framework: Install the Vue.js dependencies. Include the Vue.js script in the HTML file. Create a Vue instance and mount it on a DOM element. Build reusable components. Leverage data responsiveness for automatic UI updates. Use event listeners to respond to user interactions. Handle page navigation via Vue Router. Manage global state via Vuex.

Apr 06, 2024 am 01:57 AM

vue

How do the vue framework and the springboot framework interact with the front and back ends?

Vue.js and Spring Boot interact through: RESTful API: Vue.js uses Axios to send asynchronous HTTP requests, and Spring Boot provides a RESTful API implementation. Data passing: Data is passed through requests and responses, such as the request body or query parameters. Request method: HTTP request methods such as GET, POST, PUT, and DELETE are used to specify the operation. Routing: Spring Boot @RequestMapping annotation defines controller routing, and Vue.js uses Vue Router to define interface routing. State management: Vu

Apr 06, 2024 am 01:51 AM

vuespring security

How does the vue front-end call the back-end interface?

Steps for the Vue front-end to call the back-end interface: Install the Axios library and create the Axios client. Send HTTP requests: GET, POST, PUT, DELETE, etc. Process response data: use .then() to process error information: use .catch()

Apr 06, 2024 am 01:48 AM

vue

How to run vue front-end

To run the Vue front-end, you need to: 1. Install Vue CLI; 2. Create a project (vue create my-project); 3. Enter the project directory (cd my-project); 4. Use development mode (npm run serve) or production mode (npm run build) to run the project.

Apr 06, 2024 am 01:45 AM

vue