What do the two curly brackets mean in Vue?

Double curly braces ({{ }}) in Vue.js are used for interpolation expressions to dynamically display data. They can be used for: interpolation simple data calling computed properties display methods results display array or object properties conditional rendering

The meaning of double braces in Vue

In Vue.js, double braces ({{ }}) are the syntax for interpolation expressions. They allow you to dynamically display data in templates, allowing for responsive updates of data.

Uses

Double braces are used for the following purposes:

• Interpolation of simple data: You can directly Interpolates a string, number, or Boolean value within double curly braces.
• Calling computed properties: Computed properties return a calculated value, and you can call them through double curly braces.
• Display method results: You can call methods through double curly braces and display their return values.
• Display the properties of an array or object: By using the dot (.) operator, you can access the properties of an array or object and display them.
• Conditional rendering: You can use conditional rendering syntax (v-if and v-else) to show or hide elements based on conditions within double curly braces.

Usage

To use double brace interpolation expressions, follow the following syntax:

<code class="html">{{ expression }}</code>

Where:

• expression is the data or calculation you want to interpolate.
• {{ is the opening brace, marking the beginning of the interpolation expression.
• }} is the closing brace, marking the end of the interpolation expression.

Example

The following are examples of double brace interpolation expressions:

<code class="html"><p>当前时间：{{ new Date() }}</p>
<p>用户已登录：{{ this.isUserLoggedIn }}</p></code>

The first example interpolates the current date and time . The second example interpolates a computed property that returns a Boolean value indicating whether the user is logged in.

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