react-middleware-async v1.2.4

react-middleware-async

redux处理异步动作的中间件

安装

npm install react-middleware-async --save

Using middleware

import { createStore, combineReducers, applyMiddleware } from "redux";
import writeOverDispatch from 'redux-middleware-async';
var REDUCERS = combineReducers({
    ...
});
var store = createStore(REDUCERS, {test: true}, applyMiddleware(writeOverDispatch));

参数

type: redux规范: 需要被dispatch动作的名称
before: 可选,异步动作之前需要执行的动作
fail: 可选,异步动作执行失败之后需要执行的动作
after: 可选,异步动作结束后需要执行的动作
async: 异步动作,一个promise对象
动作结束后的数据: 处理器中接收action, action.async就是异步动作的反馈
注: 如果异步动作失败了,并且不存在fail做错误处理的动作
	返回: {
		type,
		async: "fail"
	}
注: async存在,声明此动作为异步动作,fail/after/before才会生效

Using action

const PPP_BEFORE = () => {
	// 执行异步动作之前执行的动作
};

const PPP_FAIL = () => {
	// 异步动作执行失败后执行的动作
};

const PPP_AFTER = () => {
	// 异步动作执行完成之后执行的动作
};

const PPP = (num) => ({
	type: "PPP", 
	before: PPP_BEFORE, 
	fail: PPP_FAIL,
	after: PPP_AFTER,
	async: new Promise((resolve) => {
		let a = parseInt(Math.random()*100);
		setTimeout(()=>{resolve(a)}, 3000);
	})
});