The role of data() in vue

The data() function in Vue.js is used to initialize and manage the data state of the component: storing mutable component data state, such as user input and API response. Keep component UI in sync with data state and respond to user interactions and events. Easily track and update data status with Vue.js’s reactive system.

The role of data() in Vue.js

data() in Vue.js A function is an object used to initialize and manage component data state. It returns a reactive object containing the component's data, which will automatically respond to changes during the component's life cycle.

Role:

• Used to store variable component data state, such as user input, API responses and calculated properties.
• Keeps the component's UI in sync with data state, allowing responses to user interaction and external events.
• Changes in data state can be easily tracked and updated through Vue.js's reactive system.

Specific purpose:

• Storage user input: Save form data, input field values ​​and selector options.
• Manage API response: Storage API request results from the server.
• Track calculated properties: Stores calculated values ​​that depend on other data properties.
• Shared state: Share data state between subcomponents, allowing communication between components.
• Manage component status: Indicates the current status of the component, such as whether it is loaded and whether an error occurs.

Usage:

data() The function is defined in the component’s options object as follows:

export default {
  data() {
    return {
      message: 'Hello Vue!'
    }
  }
}

This code creates a data attribute named message with an initial value of "Hello Vue!". When a component's data state is updated, Vue.js automatically updates the component's UI to reflect these changes.

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