Are the three points in vue appended to two arrays?

In Vue, three dots (...) represent expansion syntax, which is used to expand arrays or objects. It has two main functions: 1. Expand arrays and merge multiple arrays into one; 2. Expand objects and merge multiple objects into one. Note: When expanded, the latter element will overwrite the value of the attribute with the same name in the previous element.

The role of three points in Vue

In Vue, three points (ie...) The symbol represents extended syntax for expanding arrays or objects. It has two main functions:

1. Expand array

Assume there are two arrays:

<code class="js">const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];</code>

You can use... The expansion syntax will The second array is appended to the first array:

<code class="js">const newArr = [...arr1, ...arr2];

console.log(newArr); // 输出：[1, 2, 3, 4, 5, 6]</code>

2. Expanding the object

Similarly, three points can be used to expand the object:

<code class="js">const obj1 = { name: 'John', age: 30 };
const obj2 = { city: 'New York' };</code>

You can use...expand syntax to merge the second object into the first object:

<code class="js">const newObj = { ...obj1, ...obj2 };

console.log(newObj); // 输出：{ name: 'John', age: 30, city: 'New York' }</code>

Note:

• When expanding , the latter element will overwrite the value of the attribute with the same name in the previous element.
• Using the ... expansion syntax will not change the original array or object, but create a new copy.
• Expansion syntax can also be used in other scenarios, such as function parameters, template strings, and deconstructed assignment expressions.

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