How to use keep-alive for page cache control in vue projects

How to use keep-alive for page cache control in the Vue project

In the Vue project, keep-alive is a very useful component that can help us implement page cache control. By wrapping a component in a keep-alive tag, you can enable the component to retain its state when switching, thereby improving the page's loading speed and user experience. In this article, we will discuss how to use keep-alive in Vue projects and give some code examples to illustrate its usage and effects.

1. What is keep-alive?
   keep-alive is a built-in component of Vue.js, used to cache components. When a component is wrapped in a keep-alive tag, it will be cached and will not be destroyed. When the component is accessed again, it will be taken directly from the cache without being recreated. This can greatly improve page loading speed and user experience.
2. How to use keep-alive?
   To use keep-alive in a Vue project, just wrap the components that need to be cached in the keep-alive tag. The sample code is as follows:

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

<script>
export default {
  name: "App",
};
</script>

In the above code, we wrap <router-view></router-view> in <keep-alive></keep-alive>. In this way, every time the route is switched, the components rendered by <router-view></router-view> will be cached.

3. keep-alive’s life cycle hook function
   keep-alive has two life cycle hook functions, which are activated and deactivated. Some custom logic can be defined in these two hook functions to provide better cache control.

The sample code is as follows:

<template>
  <div>
    <keep-alive :include="['Home']" @activated="handleActivated" @deactivated="handleDeactivated">
      <router-view></router-view>
    </keep-alive>
  </div>
</template>

<script>
export default {
  name: "App",
  methods: {
    handleActivated() {
      // 在keep-alive激活时执行的逻辑
      console.log("Activated");
    },
    handleDeactivated() {
      // 在keep-alive停用时执行的逻辑
      console.log("Deactivated");
    },
  },
};
</script>

In the above code, we specify the components that need to be cached through the include attribute, and through activated and deactivated properties are bound to the handleActivated and handleDeactivated methods respectively. This way, when these components are activated and deactivated, the corresponding methods will be called.

4. Use the exclude attribute to exclude components that do not need to be cached
   If we want to exclude some components from being cached, we can use the exclude attribute. The sample code is as follows:

<template>
  <div>
    <keep-alive :exclude="['Login']">
      <router-view></router-view>
    </keep-alive>
  </div>
</template>

In the above code, we use the exclude attribute to specify the components that do not need to be cached, so that these components will not be cached.

Summary:
In the Vue project, using keep-alive can easily achieve page cache control. By wrapping components that need to be cached in keep-alive, the page loading speed and user experience can be improved. Through life cycle hook functions and properties, we can also have more fine-grained cache control. I hope this article can help you understand and apply the keep-alive component and play a greater role in your project.

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