Menu
×
   ❮   
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP HOW TO W3.CSS C C++ C# BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS R TYPESCRIPT ANGULAR GIT POSTGRESQL MONGODB ASP AI GO KOTLIN SASS VUE DSA GEN AI SCIPY AWS CYBERSECURITY DATA SCIENCE
     ❯   

Vue v-once 指令


示例

使用 v-once 指令仅渲染一次 <img> 元素。

<template>
  <h1>v-once Example</h1>
  <p>The image is only rendered once. Changing the image source does not have any effect.</p>
  <img v-once v-bind:src="imgUrl[imgIndex]">
  <p>Img src: '{{ imgUrl[imgIndex] }}'</p>
  <button v-on:click="changeImg">Change image</button>
</template>
运行示例 »

定义和用法

v-once 指令用于仅渲染一次元素。

通过仅渲染一次元素,可以提高性能。

当元素具有 v-once 指令时,其所有子元素在第一次渲染后也变为静态的。

可以使用 v-memo 指令来限制元素渲染的频率,从而提高性能。


相关页面

Vue 参考:Vue v-memo 指令

Vue 教程:Vue v-bind 指令

Vue 教程:Vue v-on 指令

Vue 教程:Vue 方法

Vue 教程:Vue 生命周期钩子


×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
[email protected]

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
[email protected]

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Copyright 1999-2024 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.