The role of props in vue

The role of props in Vue.js is to pass data, isolate data, improve reusability, and perform type checking. Steps: 1. The child component declares a prop array or object; 2. The parent component uses v-bind to bind data to the child component prop.

The role of props in Vue.js

props (full name properties) is a type of Vue.js Special properties used to pass data between parent and child components. Its main functions are as follows:

1. Data transfer:

props allows parent components to pass data to child components, thereby achieving one-way binding of data.

2. Data isolation:

Each sub-component has independent props and is isolated from the props in other sub-components to avoid data pollution.

3. Improve reusability:

Subcomponents can receive different data through props, thereby improving reusability. The same subcomponent can be used in different scenarios, just modify the incoming props.

4. Type checking:

props can specify the data type to perform type checking at compile time and improve the robustness of the code.

Steps to use props:

1. Subcomponent:In subcomponent, use props array or Object to declare the received props.
2. Parent component: In the parent component, use the v-bind directive to bind data to the child component's prop.

Example:

Child component:

<code><script>
export default {
  props: ['message']
}
</script>

<template>
  <p>{{ message }}</p>
</template></code>

Parent component:

<code><template>
  <my-component v-bind:message="greeting" />
</template>

<script>
export default {
  data() {
    return {
      greeting: 'Hello!'
    }
  }
}
</script></code>

In this case, the parent The component passes greeting data to the message prop of the subcomponent through the :message directive, and the subcomponent will render the received message.

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