Experience summary of Vue application performance optimization

Experience summary of Vue application performance optimization

Vue.js is a front-end development framework that makes front-end development simpler and more efficient through data-driven view updates. However, as the scale of our Vue application gradually increases, performance issues may gradually become apparent. This article will summarize some experience in Vue application performance optimization, with code examples to help developers better optimize Vue applications.

1. Reduce re-rendering

The core features of Vue are responsive data and componentization. However, when data changes, Vue will re-render globally by default, which may cause performance issues. In order to avoid unnecessary re-rendering, we can take the following measures:

1. Use the v-once directive: The v-once directive can mark elements and components to be rendered only once, and will not be rendered when the data changes. Render again. For example:

<template>
  <div>
    <h1 v-once>{{ title }}</h1>
    <p>{{ content }}</p>
  </div>
</template>

2. Use computed properties: computed properties can automatically cache calculation results based on responsive data to avoid repeated calculations. For example:

<template>
  <div>
    <h1>{{ title }}</h1>
    <p>{{ formattedContent }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      content: 'Lorem ipsum dolor sit amet',
    };
  },
  computed: {
    formattedContent() {
      // 在这里进行一些复杂的计算，返回格式化后的内容
      return this.content.toUpperCase();
    },
  },
};
</script>

2. Optimize list rendering

List rendering is a common scenario in Vue applications. When there are too many list items, performance problems may become obvious. In order to optimize list rendering, we can take the following measures:

1. Use the key attribute of v-for: When v-for loop rendering, add a unique key attribute to each list item to facilitate Vue Ability to better track changes to each item. For example:

<template>
  <ul>
    <li v-for="item in items" :key="item.id">{{ item.name }}</li>
  </ul>
</template>

2. Use v-show instead of v-if: In list items that need to be frequently switched, using v-show instead of v-if can improve performance. Because v-show only controls show/hide by modifying CSS, while v-if will recreate and destroy components every time you switch.

<template>
  <ul>
    <li v-for="item in items" :key="item.id" v-show="item.isVisible">{{ item.name }}</li>
  </ul>
</template>

3. Delayed calculation and rendering

Some operations and rendering that require large calculations may not need to be executed immediately, and performance can be improved by delayed calculation and rendering. The following are some common application scenarios and optimization tips:

1. Use asynchronous components: For some components that do not need to be displayed immediately during initialization, you can use asynchronous components for lazy loading. This can avoid the overhead of loading a large number of components at once and improve the initial loading performance of the application.

<template>
  <div>
    <h1>{{ title }}</h1>
    <AsyncComponent />
  </div>
</template>

<script>
const AsyncComponent = () => import('./AsyncComponent.vue');

export default {
  components: {
    AsyncComponent,
  },
};
</script>

2. Use v-once to delay rendering: When some content does not need to be rendered immediately during initial loading, v-once can be used for delayed rendering. This avoids the overhead of loading a large amount of content initially.

<template>
  <div>
    <h1>{{ title }}</h1>
    <template v-if="showContent">
      <p v-once>{{ content }}</p>
    </template>
  </div>
</template>

<script>
export default {
  data() {
    return {
      showContent: false,
    };
  },
  mounted() {
    // 模拟异步加载数据
    setTimeout(() => {
      this.showContent = true;
    }, 1000);
  },
};
</script>

Summary:

Vue application performance optimization is a continuous process. The above are just some common optimization techniques and experience summaries. In actual projects, optimization needs to be carried out according to specific circumstances. I hope this article can help developers better improve the performance of Vue applications.

The above is a summary of experience in optimizing Vue application performance. Code samples have been attached to the article. I hope it will be helpful to you.

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