Use the keep-alive component to implement content caching of vue pages

Use the keep-alive component to implement content caching of Vue pages

In Vue development, we often encounter the need to cache page content to improve page performance and user experience. Vue provides a very convenient component - keep-alive, which is used to cache page content. This article will introduce how to use the keep-alive component to implement content caching and provide code examples.

1. Introduction to keep-alive component

keep-alive is an abstract component of Vue.js, used to cache dynamic components or component trees. It provides two main attributes:

• include: Specifies the name of the component that needs to be cached, which can be a string or a regular expression. Only matching components will be cached.
• exclude: Specify the name of the component that does not need to be cached, which can be a string or a regular expression. Matched components will not be cached.

2. Use the keep-alive component to cache page content

It is very simple to use the keep-alive component to cache page content. You only need to add keep outside the component that needs to be cached. -alive tag is enough. The following is an example:

<template>
  <keep-alive>
    <router-view></router-view>
  </keep-alive>
</template>

In the above example, we use Vue Router to manage page jumps and wrap the router-view component in a keep-alive component. In this way, only matching routing components will be cached, and other unmatched components will not be cached.

In addition, you can also use the include and exclude attributes to accurately specify the components that need to be cached or exclude the components that do not need to be cached. Here is an example:

<template>
  <keep-alive :include="includeComp" :exclude="excludeComp">
    <router-view></router-view>
  </keep-alive>
</template>

<script>
export default {
  data() {
    return {
      includeComp: /ComponentA|ComponentB/,
      excludeComp: /ComponentC/
    }
  }
}
</script>

In the above example, we used regular expressions to specify the components that need to be cached and the components that do not need to be cached. Only components that match the includeComp regular expression, and components that do not match the excludeComp regular expression, will be cached.

3. The life cycle hook function of the keep-alive component

The cache component inside the keep-alive component will trigger a series of life cycle hook functions. These hook functions can be used to perform some specific logical operations. The following lists some commonly used life cycle hook functions:

• activated: Triggered when the cache component enters the page, some initialization operations can be performed in this hook function.
• deactivated: Triggered when the cache component leaves the page. Some cleaning operations can be performed in this hook function.

<template>
  <keep-alive>
    <router-view></router-view>
  </keep-alive>
</template>

<script>
export default {
  activated() {
    console.log('缓存组件进入页面');
    // 执行初始化操作
  },
  deactivated() {
    console.log('缓存组件离开页面');
    // 执行清理操作
  }
}
</script>

4. Notes

It should be noted that the keep-alive component only applies to dynamic components or component trees, and is invalid for static components. In addition, when using keep-alive components, you should avoid caching content too much to avoid taking up too much memory.

5. Summary

Using the keep-alive component can easily cache Vue page content and improve page performance and user experience. The above introduces the introduction, usage and life cycle hook functions of the keep-alive component, and provides corresponding code examples. I hope it will be helpful for you to use keep-alive components in Vue development!

Reference materials:

• Vue official documentation: https://vuejs.org/v2/api/#keep-alive

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