How to destroy the previous page before Vue jumps

With the development of front-end frameworks, more and more websites and applications are beginning to use Vue as the front-end framework. As a lightweight framework, Vue has excellent features such as responsiveness and componentization. However, when using Vue to jump to a page, some problems may occur, such as the previous page not being destroyed, resulting in excessive memory usage, event listeners not being correctly unbound, etc. This article will introduce how to destroy the previous page before jumping in Vue.

1. Destroy the event listener of the previous page

In Vue, we can add event listeners through the created() life cycle function. For example, in a component, we need to listen to the mouse wheel event:

created() {
  window.addEventListener('wheel', this.onWheel);
}

This event listener is added when the component is created, but when we jump to the page, the previous page is not destroyed. This event listener The server has not been deleted. This may cause some troubles, such as the browser's scroll wheel event being monitored by multiple pages at the same time, increasing memory usage and performance consumption.

To avoid this situation, we need to remove the event listener when the component is destroyed. This can be achieved in the beforeDestroy() life cycle function:

beforeDestroy() {
  window.removeEventListener('wheel', this.onWheel);
}

This function will be called before the Vue instance is destroyed and removes the wheelevent listener.

2. Destroy the timer of the previous page

In Vue, we can set the timer through setInterval() and setTimeout(). These timers may be added when the component is created, but may not be cleared correctly when the component is destroyed. If the timers are not cleared in time, they will continue to run until the page is unloaded or the browser is reloaded.

To avoid this situation, we need to clear the timer when the component is destroyed. This can be achieved through the beforeDestroy() life cycle function:

beforeDestroy() {
  clearInterval(this.intervalId);
  clearTimeout(this.timeoutId);
}

This function will be called before the Vue instance is destroyed and clears the interval and timeout timers.

3. Destroy the non-Vue components of the previous page

In addition to the Vue component itself, there may be some non-Vue components on the page, such as third-party library plug-ins. Components also need to be properly cleaned. If these components are not destroyed, they may continue to occupy memory and resources, causing page performance degradation and memory leaks.

In the beforeDestroy() life cycle function of the Vue component, we can use the destroy() method to destroy non-Vue components. For example, if we use a third-party plugin in a component:

created() {
  this.$plugin = new Plugin();
  this.$plugin.init();
}

beforeDestroy() {
  this.$plugin.destroy();
}

This code snippet shows how to destroy a third-party plugin. On component creation, we create a new plugin instance and call the init() method. When the component is destroyed, we call the destroy() method to destroy the plug-in and release the memory.

Summary

Destroying the previous page before jumping in Vue is an important issue. If not handled correctly, it may lead to performance degradation and memory leaks. This article introduces how to correctly destroy event listeners, timers and non-Vue components through Vue's life cycle functions. In the actual development process, corresponding adjustments and processing should be made according to specific situations to ensure the performance and stability of the page.

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