What does props mean in vue

Props in Vue is the mechanism through which child components receive data from parent components. The syntax for Props consists of specifying accepted Props in the child component definition, and passing Props in the parent component via pass properties. Props can be of different types, support required fields, default values ​​and validation functions, effectively controlling the behavior and display of sub-components.

Props in Vue

In Vue.js, Props is an abbreviation, meaning "Properties" , which is the mechanism for transferring data between parent components and child components.

What are Props?

Props are the input values ​​accepted by the child component and are passed by the parent component. They allow parent components to control the behavior and display of child components.

Syntax for Props

In the definition of a child component, use the props option to specify acceptable Props:

<code class="javascript">export default {
  props: ['prop1', 'prop2']
}</code>

In the parent component, Props are passed by adding attributes to the child component elements:

<code class="javascript"><MyComponent prop1="value1" prop2="value2" /></code>

Type of Props

Props can have different data types, for example:

• String
• Number
• Boolean value
• Object
• Array

Required items for #Props

You can specify whether Props are required by adding the required attribute:

<code class="javascript">props: {
  prop1: {
    type: String,
    required: true
  }
}</code>

Default value of Props

If the Props value is not passed in the parent component, you can use the default attribute to specify the default value:

<code class="javascript">props: {
  prop1: {
    type: String,
    default: 'default value'
  }
}</code>

Validation of Props

You can use the validator option to verify the value of Props, for example:

<code class="javascript">props: {
  prop1: {
    type: Number,
    validator: (value) => value > 0
  }
}</code>

Summary

Through Props, the parent component can effectively report to the child Components pass data to control their behavior and display. Props types, required fields, and default values ​​provide flexibility, while validation features ensure data accuracy.

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