What does prop mean in vue

Prop in Vue.js is a communication mechanism that allows child components to receive data from parent components and modify these data. Prop defines the data types and default values ​​that child components can receive. The advantages of Props include data encapsulation, data validation, and parent component control. When using Prop, the parent component passes data to the child component through the props attribute. The child component declares the Prop names and types it accepts through the props option, and uses this.foo to access the value of the Prop. Props can have primitive, array, object or function types and support specifying default values.

What are Props in Vue.js?

Prop in Vue.js is a communication mechanism between components, allowing child components to receive and modify data passed in from parent components. It is essentially a special property that defines the data types and default values ​​that a child component can receive from its parent component.

How Prop works:

When a parent component passes data to a child component, it passes the data through the Prop property. In child components, Props can be declared via the props option, which specifies the Prop names and types that the child component can accept.

Main advantages of Prop:

• Data encapsulation: Prop allows child components to receive data without directly accessing the state of the parent component . This helps keep components reusable and maintainable.
• Data validation: Prop can specify the data type, which helps prevent incorrect data from being passed into child components.
• Parent component control: The parent component has final control over the data passed to the child component through Prop.

How to use Prop:

In the parent component, use the props attribute to pass data to the child component:

<code class="html"><Child-Component :foo="myData" /></code>

In the child component, declare the Prop using the props option:

<code class="javascript">export default {
  props: ['foo'] // foo 是一个 Prop 名称
}</code>

In the child component, the value of the Prop can be accessed through this.foo.

Types of Prop:

Prop can have the following data types:

• Basic types (e.g. string, number, boolean)
• Array
• Object
• Function

Default value of Prop:

If not provided prop value, you can use the default option to specify a default value:

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

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