The difference between ref and data in vue

In Vue.js, ref is used to reference DOM elements or component instances, while data is used to manage component state. ref is only valid in the component template, read-only and cannot be modified; data is valid in the entire component and can be modified. Best practice is to use data to manage component state and refs to access the DOM or interactive components.

The difference between ref and data in Vue.js

In Vue.js, ref and data are used Different mechanisms for managing component state.

#ref

ref is a special attribute used to reference a DOM element or component instance. It allows you to access internal elements or components from outside the component. The syntax for using ref is as follows:

<template>
  <div ref="myRef">...</div>
</template>

<script>
  export default {
    mounted() {
      console.log(this.$refs.myRef); // 引用 DOM 元素
    }
  }
</script>

data

data is a property that contains the state information of the component. It is the only source of modifiable state within the component. The syntax for using data is as follows:

<template>
  <p>{{ message }}</p>
</template>

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

Key Difference

The main difference between ref and data is:

• State Management: data is used to manage the state information of components, while ref is used to reference DOM elements or component instances.
• Scope: data is valid in the entire component, while ref can only be used in the component template.
• Modability: data is modifiable, while ref is read-only.
• Usage scenarios: ref is usually used to operate DOM elements or interact with other components, while data is used to manage the state inside the component.

Best Practices

The best practices for using ref and data in Vue.js depend on your specific needs. In general, you should use data to manage component state, and refs to access DOM elements or interact with other components.

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