What does the props option in vue do?

In Vue, the props option is used to pass data from parent components to child components. Its main function is to achieve data sharing, maintain one-way data flow and improve code readability. Declare the properties to be passed in the parent component and receive these properties in the child component. In addition, the props option also supports type verification, which can specify attribute types, default values, and verification rules to ensure data consistency and security.

The role of props options in Vue

In Vue, props Options are used to pass data from parent component to child component. It is an object that contains fields, each field representing an acceptable property in a child component.

Main function:

props The main function of the option is:

• Allow parent component to pass to child component data, thereby enabling data sharing between different components.
• Maintain one-way data flow of child component status, control data flow from parent component to child component, and prevent child components from affecting the parent component state.
• Improving code readability, by clearly defining the properties accepted by subcomponents, the interaction between components can be made clearer.

Usage:

In the parent component, use the props option to declare the data properties to be passed to the child component. For example:

export default {
  data() {
    return {
      message: 'Hello from parent'
    }
  },
  props: ['message']
}

In the child component, use the props option to receive the data passed by the parent component. For example:

export default {
  props: ['message']
}

Now, child components can use this.message to access the data passed by the parent component.

Type validation:

#props Options can also be used to specify the type, default value and validation rules of the attribute. For example:

export default {
  props: {
    message: {
      type: String,
      default: 'Hello from default',
      required: true
    }
  }
}

This will force the parent component to pass a message property of type string, and use the default value if not passed.

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