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How to get the value of the drop-down box in vue

How to get the value of the drop-down box in vue

In Vue, there are two ways to obtain the value of the drop-down box: 1. Use the v-model directive for two-way binding; 2. Locally listen to the change event of the drop-down box and obtain the value.

May 02, 2024 pm 09:42 PM
vue
How to get event object in vue

How to get event object in vue

Methods to obtain event objects in Vue are: 1. Using the event parameter; 2. Through the $event attribute; 3. Using native event listeners. The event object contains various information about the event, such as target, type, mouse coordinates, modifier key state, and methods to prevent event behavior.

May 02, 2024 pm 09:39 PM
vue
What are hooks in vue

What are hooks in vue

Vue hooks are a mechanism for injecting component life cycle logic, which can extend component functionality without modifying component code. Hooks are reusable functions that can be attached to lifecycle hooks and provide the following benefits: Reusability Testability Code separation When using Hooks, they are imported and called in the setup() function, such as useState(). Vue also provides predefined hooks such as useState, useEffect and useContext. Additionally, developers can create custom hooks to encapsulate common logic. In short, Vue hooks enhance component functionality and improve code reusability and maintainability.

May 02, 2024 pm 09:39 PM
vue
What does class mean in vue

What does class mean in vue

In Vue, class is an attribute used to dynamically control the CSS class of an element. Its syntax is { class: {...} }. It can dynamically control the application and removal of CSS classes through object binding key-value pairs, binding expressions, and binding arrays to implement complex style logic.

May 02, 2024 pm 09:36 PM
css vue 键值对
The role of module in vue

The role of module in vue

Modules in Vue are used to organize and reuse code. Specific functions include: Code organization: Modules allow the code to be organized into smaller manageable units, improving the readability and maintainability of the code. Code reuse: Modules can be exported and imported into other modules to achieve code reuse across components and files. Dependency management: Modules help manage dependencies between components and clarify the dependencies required by components. Namespace: The module creates a namespace for exported values ​​to avoid naming conflicts. Type inference: In Vue 3, modules can be used for type inference, using TypeScript type inference to derive values.

May 02, 2024 pm 09:36 PM
vue
What does v-for in vue mean?

What does v-for in vue mean?

The v-for directive is used in Vue to iterate over an array or object and render HTML for each element, creating a dynamic list. It uses the syntax v-for="item in items", where item is the alias and items is the array or object to be iterated over. v-for can iterate over an array to create an unordered list, or over an object to create a paragraph list. Note: The item alias can only be used within the instruction block. You can use the track-by and v-key attributes to optimize performance.

May 02, 2024 pm 09:36 PM
vue
In vue: the difference with @

In vue: the difference with @

The colon (:) uses data binding events, and the at symbol (@) uses method events. Colon binding has higher priority, event modifiers can be used, and the at symbol syntax is more concise.

May 02, 2024 pm 09:33 PM
vue
The usage and function of $refs in vue

The usage and function of $refs in vue

$refs in Vue.js provide access to DOM nodes or subcomponent instances of elements inside a component. Its usage includes: accessing DOM elements, you can directly obtain the DOM node of the element through ref. To access the subcomponent instance, you can obtain the instance object of the subcomponent through ref. To access multiple DOM elements, a set of DOM elements can be accessed through the $refs array. The advantage of $refs is that it can directly access the DOM, realize component communication, and perform dynamic control. However, it should be noted that it is only available after the component is mounted and will not be updated automatically. Overuse may lead to increased coupling.

May 02, 2024 pm 09:33 PM
vue
What does var mean in vue

What does var mean in vue

The var keyword in Vue is used to declare local variables that are only valid within the current scope. Its declaration syntax is var <variable_name>. The var variable has the following characteristics: its scope is the current function or code block. Redeclaration and hoisting are allowed, so a var variable with the same name can be declared multiple times in the same scope. var variables are hoisted to the top of the code block during execution and can be used before being declared.

May 02, 2024 pm 09:33 PM
vue 作用域
What is the difference between arrow functions and ordinary functions in vue

What is the difference between arrow functions and ordinary functions in vue

The main difference between arrow functions in Vue and ordinary functions is that arrow functions bind external this context, inherit external lexical scope, implicitly return, and are suitable for event handling, callbacks and getters/setters. Ordinary functions are suitable for accessing their own this, creating new scopes, explicitly returning specific values, and defining complex or reusable functionality.

May 02, 2024 pm 09:31 PM
vue 作用域
The principle of key in vue

The principle of key in vue

The key in Vue is an attribute used to uniquely identify a list item, which is crucial for efficient rendering and data management. By comparing changes on the virtual DOM, Vue can use keys to identify list items and avoid unnecessary DOM re-rendering, thereby optimizing performance and ensuring unique identification of list items.

May 02, 2024 pm 09:30 PM
vue
What is the role of key value in vue

What is the role of key value in vue

The key value in Vue is used to identify list elements, helping Vue track changes and effectively update the DOM. This provides faster rendering, more accurate updates, and a more stable DOM. Best practices include always assigning unique key values, using unique identifiers that don't change, and avoiding using array indexes.

May 02, 2024 pm 09:30 PM
vue
Can jquery be used in vue?

Can jquery be used in vue?

Yes, you can use jQuery with Vue. Common reasons for using jQuery include: integrating with legacy code, using specific jQuery plugins, and handling complex DOM manipulations. To use jQuery in a Vue project, you need to install the jQuery library and import it into the component. However, it is recommended to use it with caution and only when absolutely necessary to avoid conflicts with Vue.

May 02, 2024 pm 09:27 PM
vue 前端应用
What does... in vue mean?

What does... in vue mean?

In Vue.js,... is the expansion operator, which is mainly used to expand iterable objects or arrays. Its usage includes: function parameters, templates, and import statements. The spread operator can spread array elements, object property values, merged objects, and all exports in imported modules.

May 02, 2024 pm 09:27 PM
vue 可迭代对象

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