Common instructions in vue

Commonly used Vue instructions include: v-bind: Bind JavaScript expressions to element attributes. v-on: Listen and handle events on the element. v-model: implements two-way data binding. v-if: Render elements based on conditions. v-for: Loop through an array or object and render elements for each value. v-else and v-else-if: Provide alternative rendering of conditional branches. v-once: Render content only when the element is rendered for the first time. v-pre: Prevent Vue.js from compiling the content of the element.

Common directives in Vue

directive plays a vital role in Vue.js, it Allows us to add behavior to Vue components, modify data, or otherwise manipulate elements.

v-bind: Modified binding

This directive is used to bind a JavaScript expression to an attribute of an element. It can dynamically update the value of the attribute, for example:

<code class="html"><button v-bind:disabled="isBusy">Save Changes</button></code>

v-on: Event handling

This directive is used to listen and handle events on the element. It can bind event handlers to elements, for example:

<code class="html"><button v-on:click="saveChanges">Save Changes</button></code>

v-model: two-way binding

This directive is used to implement input and form elements with Vue Two-way data binding between data attributes. It allows data to be updated automatically, for example:

<code class="html"><input v-model="username"></code>

v-if: Conditional rendering

This directive is used to render conditionally based on the true or false of a JavaScript expression element. It can show or hide elements based on conditions, for example:

<code class="html"><div v-if="isLoggedIn">Welcome</div></code>

v-for: Loop rendering

This instruction is used to iterate over an array or object and give it each value Render elements. It can dynamically create elements, such as:

<code class="html"><ul>
  <li v-for="fruit in fruits">{{ fruit }}</li>
</ul></code>

v-else and v-else-if: alternative rendering

These instructions are used when the v-if condition is not true Render alternative elements. They provide a way to handle multiple conditional branches, for example:

<code class="html"><div>
  <p v-if="isLoggedIn">Welcome</p>
  <p v-else-if="isGuest">Hello, guest</p>
  <p v-else>Please sign in</p>
</div></code>

v-once: render once

This directive is used to only render the element for the first time when rendering content. It prevents content from being rendered multiple times when the component is updated, which can improve performance, for example:

<code class="html"><div v-once>Static Content</div></code>

v-pre: Prevent compilation

This directive is used to prevent Vue. js compiles the content of the element, for example:

<code class="html"><div v-pre>
  {{ name }}
</div></code>

These are the most commonly used directives in Vue, and they allow us to create interactive and dynamic applications.

The above is the detailed content of Common instructions in vue. For more information, please follow other related articles on the PHP Chinese website!