How to remove monitoring when Vue closes the page

In the process of developing web applications using Vue.js, it is often necessary to add some listeners to components to capture user operations in real time and update based on feedback. However, these listeners remain active when the user navigates away from the page or closes the page, which may result in unnecessary requests or data updates when leaving the page. In order to solve this problem, we need to remove these listeners when the component is destroyed to protect the stability and performance of our application.

Vue.js provides a property called destroyed, which will perform corresponding operations when the component is destroyed. We can remove the added listener in this method. Let's take a look at the specific implementation process.

First of all, adding a listener in Vue.js is very simple, we only need to use the $on method. For example, add a listener in the component's created() life cycle:

created() {
    window.addEventListener('scroll', this.handleScroll)
},

This listener will be called when the user scrolls the browser page, and then executes the handleScroll method in the component.

When we need to remove this listener when the page is destroyed, we can use Vue's destroyed hook, as shown below:

destroyed() {
    window.removeEventListener('scroll', this.handleScroll)
},

In this way, when the user leaves this page, the listener will be automatically removed, ensuring the performance and stability of the application.

In addition to adding and removing listeners in Vue.js, we can also use third-party libraries to simplify this process. For example, for user scroll events, we can use the throttle method in the throttle-debounce library to reduce unnecessary network requests:

import { throttle } from 'throttle-debounce'

created() {
    window.addEventListener('scroll', throttle(250, this.handleScroll))
},

destroyed() {
    window.removeEventListener('scroll', throttle(250, this.handleScroll))
},

This method will limit the execution interval of the handleScroll method to 250ms, reducing network The frequency of requests ensures application performance.

To sum up, when we use Vue.js to develop web applications, we need to ensure the performance and stability of the application. In order to avoid unnecessary network requests or data updates when the user leaves the page, we need to remove unnecessary listeners when the component is destroyed. By using the destroyed hook or third-party library provided by Vue, we can quickly add and remove listeners to keep our application efficient.

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