Detailed explanation of fragments function in Vue3: a more efficient way to render components

In Vue3, the newly introduced fragments function provides a more efficient component rendering method, which can effectively improve page performance and user experience. This article will introduce in detail the characteristics, usage and effects of the fragments function so that developers can better grasp the new features in Vue3.

1. Features of the Fragments function

The Fragments function is a newly introduced function in Vue3 and can be used in components to return multiple child nodes. Compared with the traditional template method, the Fragments function has the following characteristics:

1.1 More efficient rendering method: The Fragments function allows the component to return multiple child nodes without wrapping them in a parent element. This This means unnecessary rendering can be avoided. In traditional templates, if a component needs to return multiple child nodes, they must be wrapped in a div or other element, which will cause unnecessary performance losses. The use of the Fragments function can effectively avoid this situation, thereby improving page rendering efficiency.

1.2 More flexible: The Fragments function can be used in any scenario where multiple components need to be returned, such as lists or tables. In traditional templates, if you need to return multiple components, you must use the v-for directive for loop rendering, which may cause page performance to degrade due to too many loops. The use of the Fragments function can avoid this situation, thereby improving the performance and flexibility of the page.

1.3 Easier maintenance: Using the Fragments function can reduce unnecessary HTML code, making it easier to maintain the component code. In traditional templates, the code becomes lengthy and complex due to the need to use the v-for instruction for loop rendering, etc. However, using the Fragments function can simplify these operations and make the code more readable and understandable.

2. How to use the Fragments function

In Vue3, the use of the Fragments function is very simple. You only need to use < > and < / > in the component. Just wrap the child nodes to be returned. For example:

<template>
  <div>
    <div>这是一个div元素</div>
    <>
      <p>这是一个p元素</p>
      <span>这是一个span元素</span>
    </>
  </div>
</template>

In the above example, we used the Fragments function to return a component containing multiple child nodes. Note that the Fragments function does not require any parameters, just use < > and < / > to wrap the child nodes to be returned.

3. The effect of Fragments function

Using the Fragments function can effectively improve the rendering performance and user experience of the component. Below we use an example to demonstrate the effect of the Fragments function.

First, we need to create a Vue3 application and use the Fragments function to return multiple child nodes in the page. As the page loads, we can use Vue's performance tracker to view the page's performance and response time. For example:

<template>
  <div>
    <div>这是一个div元素</div>
    <>
      <p>这是一个p元素</p>
      <span>这是一个span元素</span>
    </>
  </div>
</template>

<script>
  import { defineComponent } from 'vue';

  export default defineComponent({
    mounted() {
      const measure = this.$performance.start('fragments-demo');

      // 异步加载完毕后停止测量
      setTimeout(() => {
        measure.stop();
      }, 1000);
    },
  });
</script>

In the above example, we used Vue’s performance tracker to measure page load time. When the component is loaded, update the performance tracker before asynchronous loading, and stop measuring after the asynchronous loading is completed. In this way, we can obtain the performance and time data of page loading.

Comparing the use of the Fragments function and the traditional template method, we can find that the page loading time using the Fragments function is shorter and the response is faster. This is because the Fragments function can avoid unnecessary rendering, thereby improving page performance. In practical applications, we can also use the Fragments function to optimize component performance and improve user experience.

4. Summary

Fragments function is a new component rendering method provided by Vue3, which can effectively improve page performance and user experience. Compared with the traditional template method, the Fragments function has the characteristics of higher rendering efficiency, more flexibility, and easier maintenance. In actual applications, we can use the Fragments function to optimize component performance and user experience according to specific business needs.

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