Vue3+TS+Vite development tips: How to optimize the performance of Vue3 applications

Vue3 TS Vite Development Tips: How to Optimize the Performance of Vue3 Applications

Introduction:
With the official release of Vue3, learning and applying Vue3 has become an important task for many developers the focus of the reader. Compared with Vue2, Vue3 brings many new features and performance optimizations, such as static tree promotion, Proxy responsive system, etc. However, even with these optimizations, we still need to pay attention to performance issues when developing Vue3 applications to provide a smoother user experience. This article will introduce some techniques for optimizing the performance of Vue3 applications and provide relevant code examples.

1. Using responsive data
   The responsive system in Vue3 is implemented using Proxy, which has better performance than Vue2's defineProperty method. When developing applications using Vue3, try to use reactive data and avoid using Object.freeze() to freeze objects, as this will make the data unresponsive.

// 错误示例
const user = { name: 'Alice', age: 20 }
Object.freeze(user)

// 正确示例
import { reactive } from 'vue'
const user = reactive({ name: 'Alice', age: 20 })

2. Avoid frequent calculated properties
   In Vue3, both calculated properties and ordinary properties can be wrapped using ref to provide responsiveness. However, since computed properties are lazy, it may be better to use ref for frequently updated data. For example, if a piece of data is used multiple times within a short period of time, consider wrapping it with a ref.

import { ref, computed } from 'vue'

// 计算属性示例
const user = ref({ name: 'Alice', age: 20 })
const userName = computed(() => user.value.name)

// 使用 ref 示例
const userName = ref('Alice')

3. Reasonable use of watch
   In Vue3, the usage of watch has undergone some changes. Now, you can directly monitor a ref or reactive object without using strings to define the properties that need to be monitored. In addition, Vue3 also provides the immediate option, which can execute a callback function immediately when the component is initialized. Proper use of watch can help us respond to data changes and execute corresponding logic.

import { ref, watch, WatchSource } from 'vue'

// 监听一个 ref 对象
const userName = ref('Alice')
watch(userName, (newValue, oldValue) => {
  console.log(newValue, oldValue)
})

// 监听一个 reactive 对象，且立即执行一次回调函数
const user = reactive({ name: 'Alice', age: 20 })
watch(() => user.name, (newValue, oldValue) => {
  console.log(newValue, oldValue)
}, { immediate: true })

4. Asynchronous components and lazy loading
   In Vue3, the writing method of asynchronous components becomes more concise, and it also supports lazy loading using the import() function. Lazy loading can help us minimize the initial loading time of the application and only load components when they are needed.

// 异步组件示例
const AsyncComponent = defineAsyncComponent(() => import('./AsyncComponent.vue'))

// 懒加载示例
const LazyComponent = () => import('./LazyComponent.vue')

5. Optimization of list rendering
   In Vue2, when using v-for to render a list, you need to set the key value to help Vue2 perform minimized DOM operations. In Vue3, due to optimizations such as static tree promotion, there is no need to manually set the key. Vue3 can automatically identify and process the optimal list rendering.

<!-- Vue2 -->
<template>
  <div>
    <ul>
      <li v-for="item in list" :key="item.id">{{ item.title }}</li>
    </ul>
  </div>
</template>

<!-- Vue3 -->
<template>
  <div>
    <ul>
      <li v-for="item in list">{{ item.title }}</li>
    </ul>
  </div>
</template>

Conclusion:
The above are some tips for optimizing Vue3 application performance. Of course, there are many other optimization methods, such as using Memo to avoid unnecessary re-rendering, rational use of static nodes, etc. In actual development, we should selectively apply these techniques according to specific situations to provide a more efficient and smooth user experience. I hope this article can provide you with some help in the development process of Vue3 TS Vite.

The above is the detailed content of Vue3+TS+Vite development tips: How to optimize the performance of Vue3 applications. For more information, please follow other related articles on the PHP Chinese website!