The role of three points in vue

Three dots (...) in Vue.js are used to: expand arrays or objects, merge objects, distribute properties, improve code readability, simplify data processing, and enhance component reusability.

The role of three dots in Vue.js

The three dots in Vue.js (.. . ), also known as the spread operator or spread operator, is used to perform the following operations:

• Expand an array or object: It expands the elements in an array or object as Individual parameters or properties. For example:

<code class="js">function sum(...numbers) {
  return numbers.reduce((a, b) => a + b, 0);
}

console.log(sum(1, 2, 3, 4, 5)); // 输出 15</code>

• Merge objects: It merges the properties from multiple objects into a new object. For example:

<code class="js">const user1 = { name: 'John', age: 30 };
const user2 = { address: '123 Main Street' };

const mergedUser = { ...user1, ...user2 };

console.log(mergedUser); // 输出 { name: 'John', age: 30, address: '123 Main Street' }</code>

• Distribution attributes: In a template, it can distribute the key-value pairs of an object to a single attribute. For example:

<code class="html"><div v-bind="{ ...props }"></div></code>

This code will distribute all key-value pairs in the props object to the properties of the div element.

Advantages of the spread operator:

• Improve code readability and simplicity.
• Simplify the processing of arrays and objects.
• Enhance the reusability of components.

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