How to use eventbus in vue

EventBus is a communication mechanism in Vue.js that allows non-parent-child communication between components. Usage includes: Create a global EventBus instance. Use eventBus.$emit() to trigger events. Use eventBus.$on() to listen for events. Its advantages include non-parent-child communication, loose coupling, and scalability.

Usage of EventBus in Vue.js

EventBus is a communication mechanism in Vue.js that allows Non-parent-child communication between components. It delivers events and data through a centralized event bus.

Installation

EventBus is an independent package and needs to be installed first:

<code class="bash">npm install --save vue-eventbus</code>

Usage

Using EventBus in a Vue.js application is very simple.

1. Create an EventBus instance

Create a global EventBus instance, usually in the main.js file:

<code class="javascript">import Vue from "vue";
import VueEventBus from "vue-eventbus";

Vue.use(VueEventBus);

// 使用 EventBus 的全局实例
const eventBus = new VueEventBus();</code>

2. Trigger events

<code class="javascript">eventBus.$emit("my-event", data);</code>

3. Listen for events

<code class="javascript">export default {
  mounted() {
    eventBus.$on("my-event", (data) => {
      // 处理事件
    });
  },
};</code>

Advantages

• Non-parent-child communication: EventBus allows components to communicate with each other even if they do not have a direct parent-child relationship.
• Loose coupling: Components communicate through EventBus instead of directly referencing each other, which improves the loose coupling of the code.
• Scalability: EventBus can be easily extended to larger applications, allowing components to communicate between modules or microservices.

Notes

• Namespace: Since all components can access the EventBus, use namespaces to avoid events Name conflicts are very important.
• Avoid a large number of events: Excessive use of EventBus will lead to reduced maintainability of the code. Use parent-child communication or other communication mechanisms whenever possible.
• Performance: The performance of EventBus may degrade as the application grows because each event will be fired in every component that listens for that event.

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