How to use interpolation expressions in vue

Vue interpolation expressions are used to dynamically access data in HTML. The syntax is a pair of curly braces containing the attributes to be accessed. Interpolation expressions can be nested and used for conditional rendering, event handling and filters. Pay attention to security when using it, and encode or escape user input data to avoid malicious script code.

Usage of interpolation expressions in Vue

Interpolation expressions are used in Vue to bind data to A syntax structure for HTML templates. It allows developers to access data in Vue instances directly in HTML templates, allowing data to be dynamically displayed on the page.

Usage

Interpolation expressions are enclosed in a pair of curly braces ({}) that contain the data attribute to be accessed. For example:

<code class="html"><p>用户名：{{ username }}</p></code>

In the above example, username is a data property in the Vue instance. When the Vue instance is updated, {{ username }} will be replaced with the current value of the username property.

Nested expressions

Interpolation expressions can be nested to access properties in complex data structures. For example:

<code class="html"><p>用户详细信息：{{ user.name }}，{{ user.email }}</p></code>

Conditional rendering

Interpolation expressions can also be used for conditional rendering, by using the v-if or v-else directive. For example:

<code class="html"><p v-if="user.isLoggedIn">用户已登录。</p>
<p v-else>用户未登录。</p></code>

Event handling

Interpolation expressions can also be used in event handling, by using the v-on directive. For example:

<code class="html"><button v-on:click="handleUserClick">单击我</button></code>

Filter

Interpolation expressions also support filters, which are used to format or transform data. For example:

<code class="html"><p>{{ user.age | uppercase }}</p></code>

In the above example, the uppercase filter converts the value of user.age to uppercase.

Security

You need to pay attention to security when using interpolation expressions, because they can execute malicious script code on the client side. To avoid this, user input data should always be encoded or escaped.

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