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What happens when v-if and v-for are combined in vue?

What happens when v-if and v-for are combined in vue?

When the v-if and v-for instructions are used at the same time: 1. v-if takes precedence. If it is false, the element will not be rendered; 2. If v-if is true, the element will be rendered iteratively according to v-for. Example: v-if checks item.visible, v-for iterates items, and only renders item.name when item.visible is true.

May 02, 2024 pm 10:30 PM
vue
What is the difference between v-if and v-show in vue

What is the difference between v-if and v-show in vue

In Vue.js, v-if and v-show are both conditional rendering instructions, but they have the following differences: v-if will remove elements, while v-show only hides elements; v-if affects the DOM structure, and v-show only affects the display state; v-if has a larger performance overhead, while v-show is smaller; v-if is used to dynamically create or destroy elements, while v-show is used to switch the display state.

May 02, 2024 pm 10:30 PM
vue
Usage of provide and inject in vue

Usage of provide and inject in vue

provide and inject are methods for sharing data in Vue.js: provide() provides data in the parent component. inject() gets the data provided by the parent component in the child component. Features: Data is responsive and flows to the required location on demand without explicitly passing props.

May 02, 2024 pm 10:27 PM
vue
Will the objects distributed by provide in vue be recycled?

Will the objects distributed by provide in vue be recycled?

Yes. Objects distributed through provide in Vue will be recycled. When the parent component or the responsive object that provides data is destroyed, the responsive object injected by the child component will also be destroyed.

May 02, 2024 pm 10:27 PM
vue
What do three dots mean in vue

What do three dots mean in vue

Three dots (...) in Vue represent the spread operator, which is used to: expand arrays and merge multiple array elements into a new array. Expand objects to combine the properties and values ​​of multiple objects into a new object. Expand function parameters to receive an indefinite number of parameters.

May 02, 2024 pm 10:24 PM
vue 可迭代对象
How to add touch events to pictures in vue

How to add touch events to pictures in vue

How to add click event to image in Vue? Import the Vue instance. Create a Vue instance. Add images to HTML templates. Add click events using the v-on:click directive. Define the handleClick method in the Vue instance.

May 02, 2024 pm 10:21 PM
vue 点击事件
How to introduce js files in vue

How to introduce js files in vue

There are four ways to introduce external JS files in Vue.js: through the <script> tag. Import modular JS files through the import statement. Register JS files as Vue components through the Vue.component() method. Mix JS file code with multiple Vue components through the Vue.mixin() method.

May 02, 2024 pm 10:21 PM
vue
Using js files in vue

Using js files in vue

There are two ways to use JavaScript files in Vue: (1) Import in the component: use the <script> tag; (2) Import in the main application: use the import statement and call the Vue.use() method. Once a script is imported, its methods, properties, and lifecycle hooks can be used in components or applications.

May 02, 2024 pm 10:21 PM
vue
Where to put the js code written in vue

Where to put the js code written in vue

JavaScript code is usually placed in <script> tags in Vue.js, but can also be placed in external JavaScript files or .vue files. Vue 3 and above supports placing JavaScript logic in the setup() function. Other placement locations include mixins, plugins, and global installations.

May 02, 2024 pm 10:18 PM
css vue
How to use v-html in vue

How to use v-html in vue

The v-html directive in Vue.js is used to: Insert raw HTML code, independent of the Vue compiler. Use the syntax: <p v-html="htmlCode"></p>, where htmlCode is a variable or expression containing HTML code. Example: <div v-html="html"><p><h1>Hello, World!</h1></p></div>Note: v-html will overwrite the element

May 02, 2024 pm 10:18 PM
vue
The role of style in vue

The role of style in vue

The style attribute of Vue.js is used to dynamically set styles in components or elements. It allows inline styles to be set directly in the template and updated dynamically. The main functions include: 1. Setting inline styles: using inline style syntax to set styles, such as <div style="color: red;">; 2. Dynamically binding styles: using v-bind:style to bind to responsive styles Data objects, such as <div v-bind:style="{ color: colorValue }">; 3. Conditional rendering style: use v-if or v-els

May 02, 2024 pm 10:18 PM
css vue
The role of v-for in vue

The role of v-for in vue

The role of v-for in Vue is to traverse an array or object and render the corresponding template for each element. Key benefits include: Simplicity and readability Dynamics and synchronization with data Reusability Performance optimization

May 02, 2024 pm 10:15 PM
vue
What is the v-for directive used for in vue?

What is the v-for directive used for in vue?

The v-for directive is used to traverse and create a list of array or object elements, generate data-bound elements based on templates, and update them efficiently as the data source changes.

May 02, 2024 pm 10:15 PM
vue
How to use for loop in vue

How to use for loop in vue

The for loop in Vue can be used to traverse arrays or objects. There are two syntaxes: v-for directive and v-for range attribute. The v-for directive uses the item alias to access the current element, while the v-for range attribute uses the i alias to access the index of the current element. Within a loop, you can use the key attribute to specify a unique key that identifies each element, helping to track changes. The $index property can be used to get the index of an element.

May 02, 2024 pm 10:15 PM
vue

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