The role of data in vue

Data in Vue.js is a reactive object used to declare and store the state of the component, including: declaring and storing the internal state of the component in a responsive manner; automatically responding to state changes and updating the UI; providing data Binding, easy access and update state; keep state isolated, each component has independent data object.

The role of Data in Vue.js

In Vue.js, data Is a reactive object that contains the UI state of the component. Its main functions are:

1. Declare and store component state

data is used to declare and store the internal state of components. These states Changes over time. For example, you could store a boolean value in data to track whether a component is open.

<code class="js">export default {
  data() {
    return {
      isOpen: false
    }
  }
}</code>

2. Respond to state changes

Vue.js will respond to any changes in the data object and update the UI accordingly Content. This means that when you change the state in data, the UI automatically updates.

For example, when you click a button to set isOpen to true, Vue.js automatically displays UI elements related to the open state.

3. Provide data binding

data Properties in objects can be used as binding expressions in templates. This allows you to easily access and update the component's state in the UI.

For example, the following template binds the isOpen state and displays the "open" text when the component is open.

<code class="html"><template>
  <div v-if="isOpen">
    <h2>打开</h2>
  </div>
</template></code>

4. Keep state isolated

Each Vue.js component has its own data object, which helps keep state isolated . This means that the state of one component does not affect the state of another component.

Note:

• data should always be an object, even if it is initially empty.
• data The function must return a pure object, which means it is raw and has no methods or reactive properties.

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