How to use props in vue

In Vue, props are used to pass data between components. Declare the props received by the child component in the parent component, use the props option in the child component to receive it, and use :prop-name="data" to pass data. Vue allows you to specify prop types to ensure the correctness of passed data, and you can use the default option to specify default values. The watch option can be used to monitor prop changes. Leverage props to facilitate communication and reuse between components.

Usage of Props in Vue

#Props in Vue are used to pass data between components, which allows Child components receive data passed from parent components. The following is the usage of props:

1. Declare props in the parent component

In the parent component, use the props option to declare the child component. Received props:

export default {
  props: ['propName']
}

2. Use props in the child component

In the child component, receive it from the parent component through the props option data:

export default {
  props: ['propName']
}

3. Pass props data

In the parent component, use the tag to pass data to the child component:

<child-component :prop-name="data"></child-component>

Among them, :prop-name is the name of the prop, and data is the data to be passed.

4. Prop type

Vue allows you to specify types for props to ensure that the data type passed is correct. Types can use any basic JavaScript type (e.g. string, number, boolean) or a custom type.

export default {
  props: {
    propName: {
      type: String,
      required: true
    }
  }
}

5. Default value

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

export default {
  props: {
    propName: {
      default: 'default value'
    }
  }
}

6. Monitor prop

When prop is updated, you can use the watch option to monitor prop changes:

export default {
  props: ['propName'],
  watch: {
    propName(newValue, oldValue) {
      // prop 更新时的操作
    }
  }
}

By using props, you can easily Pass data between Vue components efficiently, promoting communication and reuse between components.

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