What are the instructions in vue

Vue is a popular JavaScript framework that allows developers to easily create interactive web applications. One of the most important features in Vue are directives, which allow adding special behavior on DOM elements. Vue provides many directives, below we will introduce some common directives.

1. v-if directive

The v-if directive is used to add or remove DOM elements based on conditions. If the condition is true, the directive will render the element and add it to the DOM; otherwise, the element will be removed. For example:

<div v-if="isShow">
  这是要显示的内容
</div>

2. v-for directive

The v-for directive is used to traverse the rendering array or object. When using the v-for directive, you need to provide an iterator, which can be each item in an array or each property in an object. For example:

<ul>
  <li v-for="item in items">{{ item }}</li>
</ul>

3. v-bind directive

The v-bind directive is used to bind HTML attributes with data in a Vue instance. It can dynamically update HTML properties to reflect changes in data in the Vue instance. For example:

<img src="/static/imghwm/default1.png"  data-src="imageSrc"  class="lazy"  v-bind: alt="">

4. v-on directive

The v-on directive is used to add event listeners on DOM elements to respond to specific events. It is very similar to JavaScript event listeners. For example:

<button v-on:click="doSomething">点击这里</button>

5. v-model directive

The v-model directive is used to bidirectionally bind form elements to data in a Vue instance. When the value of the form element changes, the data in the Vue instance is also updated. For example:

<input type="text" v-model="message">
<p>{{ message }}</p>

6. v-show directive

The v-show directive is used to hide or show DOM elements based on conditions. Unlike the v-if directive, the v-show directive only hides or shows elements, rather than removing or adding elements from the DOM. For example:

<div v-show="isShow">
  这是要显示的内容
</div>

7. v-cloak directive

The v-cloak directive is used to prevent Vue templates from being displayed when the page loads. In a Vue instance, the v-cloak directive is used with an element with the appropriate CSS styling. For example:

<style>
  [v-cloak] {
    display: none;
  }
</style>
<div v-cloak>
  {{ message }}
</div>

Summary:

The instructions in Vue are very rich, allowing developers to easily bind data and behavior to DOM elements. In Vue, powerful functionality can be achieved using directives to create web applications with rich interactivity and dynamics. In addition to the instructions introduced above, there are many other useful instructions that developers can learn and use according to their own needs.

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