How to use v-show in vue

The v-show directive is used to dynamically hide or display elements in Vue.js. Its usage is as follows: The syntax of the v-show directive: v-show="booleanExpression", booleanExpression is a Boolean expression that determines the element Whether to display. The difference with v-if: v-show only hides/shows elements through the CSS display property, which optimizes performance; while v-if conditionally renders elements and recreates them after destruction.

Usage of v-show in Vue.js

v-show is one of Vue.js Directive for dynamically hiding or showing elements. It is similar to the v-if directive, but has a few key differences.

Usage

The syntax of the v-show instruction is as follows:

<code>v-show="booleanExpression"</code>

Among them, booleanExpression is a Boolean expression, which Determines whether the element should be displayed. If booleanExpression is true, the element will be shown; if false, the element will be hidden.

The difference between v-if

The most important difference between v-show and v-if instructions is:

• Performance optimization: v-show hides or shows elements only through CSS display properties, which is more efficient than re-rendering and destroying elements in v-if.
• Conditional rendering: v-if will render the element conditionally, which means that if the conditions change, the element will be destroyed and then recreated. In contrast, v-show does not destroy the element but uses CSS to hide or show it.

Example

To use v-show, simply add the directive to the element you want to hide or show, like this:

<div v-show="show">
  <!-- 元素内容 -->
</div>

When the show variable is true, the element will be displayed; when show is false, the element will be hidden.

Summary

v-show is a powerful directive for dynamically hiding or showing elements. It's more efficient than v-if because it doesn't re-render or destroy elements. v-show is ideal if you need to show or hide elements while keeping the DOM structure intact.

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