What does... in vue mean?

In Vue.js,... is an expansion operator, mainly used to expand iterable objects or arrays. Usage includes: function parameters, templates, and import statements. The spread operator can spread array elements, object property values, merged objects, and all exports in imported modules.

#What is ... in Vue?

In Vue.js, ... is the spread operator, used to spread iterable objects or arrays. It is mainly used to expand the elements of an array or object into individual parameter or property values.

Usage:

The expansion operator can appear in the following locations:

• In function parameters: functionName(... args)
• In the template:<template v-bind:property="...obj">
• In the import statement: import { ...components } from 'library'

Function:

The main functions of the expansion operator include:

• Expand array: Expand array elements into individual parameters or attribute values. For example: [1, 2, 3] => 1, 2, 3
• Expand object:Expand object property values ​​into separate parameters or property values . For example: { a: 1, b: 2 } => a: 1, b: 2
• Merge objects: Merge multiple objects into a new object. For example: { ...obj1, ...obj2 }
• Import module: Import all export items in the module. For example: import { ...components } from 'library'

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