How to use the data inside the component and the props of the component parameters to achieve data transfer in Vue

Vue is a very popular front-end development framework, in which components are very important building blocks. In Vue, the data inside the component and the props of the component parameters can be used well together to achieve data transfer.

In Vue components, data is the state data inside the component. It can be accessed and modified by all methods in the component. Using data inside a component can be declared in the following way:

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

In this example, we declare a data called message. This data can be accessed and modified in all methods inside the component.

But what if we want to share data between components? At this time, we can use component parameter props to pass data. Props allow us to pass data between components.

The following is an example that demonstrates how to use props in components to pass data:

  // 父组件
  <template>
    <div>
      <child-component message="Hello Vue!"></child-component>
    </div>
  </template>

  // 子组件
  <template>
    <div>
      <p>{{ message }}</p>
    </div>
  </template>

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

In this example, the parent component passes a prop named message to the child component with a value of 'Hello Vue!'. In the template of the child component, we use {{message}} to display the value of this props.

But, what should we do if we want to modify the value of this props in the subcomponent? At this time, we can use the .sync modifier in Vue to pass props and implement two-way binding:

  // 父组件
  <template>
    <div>
      <child-component :message.sync="message"></child-component>
    </div>
  </template>

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

  // 子组件
  <template>
    <div>
      <input v-model="message">
      <p>{{ message }}</p>
    </div>
  </template>

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

In this example, we pass a prop named message in the parent component, using . The sync modifier implements two-way binding. In the child component, we use v-model to bind the message to an input and modify its value inside the component.

However, it should be noted that if you want to modify the value of props in a child component, you must also define a parent component event of update:propName and use $emit to trigger this event in the child component. In this example, we define an event named update:message and use $emit in the child component to update the value of the message in the parent component.

To sum up, through the data inside the component and the component parameter props, we can easily realize data transfer between components in Vue. If you use it correctly, passing data between components will be very simple and your code will be easier to maintain.

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