The difference between Vue3 and Vue2: more convenient dynamic component creation

The difference between Vue3 and Vue2: more convenient dynamic component creation

Vue.js is a popular JavaScript framework for building user interfaces. It binds data and DOM in a data-driven manner, enabling the ability to quickly build responsive applications. Vue3, as the next version of Vue.js, brings some new features and improvements. Among them, one of the most anticipated features is more convenient dynamic component creation. This article will explore the improvements in dynamic component creation in Vue3 compared to Vue2.

First, let us review how dynamic components are created in Vue2. In Vue2, we use the built-in component component to create dynamic components. We need to use the tag in the parent component and dynamically load the corresponding child component by defining the component name in the parent component data. The following is an example:

<template>
  <div>
    <component :is="currentComponent"></component>
  </div>
</template>

<script>
import ComponentA from './ComponentA.vue'
import ComponentB from './ComponentB.vue'

export default {
  data() {
    return {
      currentComponent: 'ComponentA'
    }
  },
  components: {
    ComponentA,
    ComponentB
  }
}
</script>

In the above code, the parent component binds currentComponent to the dynamic component through the :is directive to determine the current rendering s component. In data, we define the initial value of currentComponent as 'ComponentA', and register two components, ComponentA and ComponentB, in the components attribute. Based on the value of currentComponent, Vue will render the corresponding child component accordingly.

In Vue3, the creation of dynamic components has become more concise and intuitive. Vue3 introduces a new built-in component <teleport>, <teleport> that can dynamically move components to any location, which provides greater flexibility for our dynamic component creation. sex. We can create dynamic components through <teleport> components and v-if instructions. The following is a code example for dynamic component creation in Vue3:

<template>
  <div>
    <teleport :to="currentComponent"></teleport>
  </div>
</template>

<script>
import { ref, h } from 'vue'
import ComponentA from './ComponentA.vue'
import ComponentB from './ComponentB.vue'

export default {
  setup() {
    const currentComponent = ref(ComponentA)

    return {
      currentComponent
    }
  },
  components: {
    ComponentA,
    ComponentB
  }
}
</script>

In the above code, we bind currentComponent to the dynamic component through the <teleport> tag. Different from Vue2, we use the Composition API in Vue3 to define responsive data and functions through the setup() function. In the setup() function, we use the ref() function to create a responsive reference type data currentComponent and define its initial value as ComponentA. In this way, we achieve dynamic component creation functionality similar to that in Vue2.

To summarize, Vue3 has improved on dynamic component creation compared to Vue2, and introduced new built-in components<teleport>. This makes the creation of dynamic components more convenient and intuitive. By using the setup() function and ref() function of the Composition API, we can handle the switching of dynamic components more flexibly, and also improve the readability and maintainability of the code. promoted. With the official release of Vue3, we can apply these improvements more easily and improve development efficiency.

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