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event-message-center

v1.4.0

Published

基于发布订阅模式实现的一个事件消息中心

Downloads

1,040

Readme

EventMessageCenter

介绍

基于 JS 发布订阅模式实现的一个事件消息中心

博客

https://hunter1024.blog.csdn.net/article/details/124452792

调试说明

  1. pnpm i (依赖安装)
  2. pnpm build(构建)
  3. pnpm example(调试源码)
  4. example 文件夹下是使用 demo
  5. 在 esm,cjs,window 环境下导入该工具库

使用说明

安装

npm install event-message-centeryarn add event-message-centerpnpm install event-message-center

引入

ESM

import { messageCenter } from "event-message-center";

CJS

const { messageCenter } = require("event-message-center");

浏览器中

<script src="./node_modules/event-message-center/dist/umd/index.js"></script>
<script>
  console.log(MessageCenter);
</script>

用法

创建实例

const bus = new MessageCenter();

直接使用全局的单例

const bus = messageCenter;

注册事件至调度中心

messageCenter.on("a", funcA);

触发调度中心的某个或者某些该事件类型下注册的函数

messageCenter.emit("a", { state: "stop" });

销毁监听

messageCenter.un("a", funcA);
messageCenter.un("a");

只注册一次监听,执行即销毁

messageCenter.once("a", funcA);

重置调度中心

messageCenter.clear();

判断事件是否被订阅

messageCenter.has("a");

同一个事件被绑定了多少函数

messageCenter.handlerLength("a");

监听 invoke 的消息,若 handler 中进行了计算或者异步操作,会反馈给 invoke

messageCenter.watch("b", funcB);

触发 watch 事件,并且接收 watch 处理结果

messageCenter.invoke("b", { num1: 1, num2: 2 }).then((result) => {
  console.log(result);
});

构造函数 options

const messageCenter2 = new MessageCenter({ blackList: ["c"], maxLen: 2 });
黑名单
messageCenter2.on("c", () => {}); // c is not allow
限制事件个数
messageCenter2.on("b", () => {});
messageCenter2.on("b", () => {});
messageCenter2.on("b", () => {}); // the number of b must be less than 2