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queue-evt

v0.2.1

Published

a subscribe-publish library

Downloads

18

Readme

evt

安装:

npm install queue-evt --save 或者 yarn add queue-evt

本项目包含两个模块: FnQueue(任务队列) 和 Signal(发布订阅)

在 HTML 中引用:

<script src="your project path/index.min.js">

用 import 或者 require 方式进行引用:

import evt from 'evt'; // 或者只引用其中一个模块: import {  FnQueue } from 'evt';

用法: FnQueue

const queue = new evt.FnQueue();

添加任务

queue.add(() => {
    console.log('this is the step0');
    queue.next('the params of step1');
}).add((step1_params) => {
    console.log(step1_params);
});

// 按添加顺序执行任务队列
queue.fire();

删除任务

function step1(step1_params) {
    // ...
}

queue.add(step0 = () => {
    console.log('this is the step0');
    queue.next('the params of step1');
}).add(step1);

queue.remove('step0').remove(step1); // 或者是:queue.remove(['step0', step1]);

跳过任务

function step1(step1_params) {
    // ...
}

// 下面的 step1 函数将不会执行
queue.add(step0 = () => {
    console.log('this is the step0');
    if(Math.floor(Math.random() * 100) % 2 == 0) {
        queue.skip();
    }
}).add(step1);

更多 demo 参考 demo 文件夹

用法: Signal

// 实例化
const signal = new evt.Signal();

// 添加一个订阅
signal.on('GET_SOME_DATA', function(queue, data) {
    console.log('the data is: ', data);
});

// 或者是添加一个队列来处理订阅
signal.on('GET_SOME_DATA', [
    function(data, queue) {
        console.log('the data is: ', data);
        data.tip = 'hello, this is a tip !';
        queue.next(data);
    },
    function(processed_data, queue) {
        console.log(processed_data);
    }
], {
    autoExcute: false
});

// 发布订阅: GET_SOME_DATA
new Promise(resolve => {
    // emulate to fetch data
    setTimeout(() => {
        resolve({ name: 'Rolling Stone' });
    }, 2000);
}).then(data => {
    signal.emit('GET_SOME_DATA', data);
});