Learn how to use the 'withState' and 'withHandlers' higher order components to easily add local state to—and create a reusable local state pattern for—your functional stateless components. No need for classes! withState: const Statue = withState('sho…

Learn how to use the 'withReducer' higher order component using the alternative reducer form. If you like using reducers in redux, you’ll be able to reuse that same technique but for local state. import React from 'react'; import {withReducer, withHa…

MySQL:5.6.35 OS:redhat5.8 今天更新数据库某些表字段,有如下两SQL: ①alter table xx modify xxxx;(表大概是77w) ②alter table sb add sbsb;(表大概是95w) 奇怪的是①产生的state为:copy to tmp table ②产生的state为:altering table 两表同样是百万级别的:后者执行虽慢,但是消耗时间不到1200s,而后者跑了2800s. 开始怀疑alter中的add 和modify 两个操…

By using the State ADT to define how our application state transitions over time, we clear up the need for a some of the boilerplate that we typically need for a solid Redux integration. We can keep our action names and creators in the same file as t…

If you have props and actions, you want one component to access those props and actions, one solution is pass those from parent to this component. But one problem for this solution is if the there are many nested component between, you need to pass t…

React的数据模型分为共有数据和私有数据,共有数据可以在组件间进行传递,私有数据为当前组件私有.共有数据在React中使用props对象来调用,它包含标签所有的属性名称和属性值,props对象有三个特性,单向流动性.显示传递性和只读性.单向流动性是指React的数据只能由父组件传递到子组件,而不能由子组件传递到父组件:显示传递性是指必须明确地在子组件中通过属性赋值,数据才可以传递到子组件:只读性是指props数据是只读的,数据修改后并未改变原始的数据模型,而是会新生成一份数据模型,并将新的数据…

所谓状态机,是一种抽象的数据模型,是“事物发展的趋势”,其原理是事件驱动.广泛地讲,世界万物都是状态机. 一.状态机是一种抽象的数据模型 在react中,props和state都可以用来传递数据.这里作一下区分. 1.props props用于组件间的数据传递.其本身只是一个属性,不是一个状态机. 从子组件的角度看,子组件无法擅自修改父组件通过属性传递的数据,因此具有单向数据流的特点. 2.state state用于设置组件本身的状态.state用于用户数据交互.事件监听. setState会调…

Learn how to use the 'lifecycle' higher-order component to conveniently use hooks without using a class component. import React from 'react'; import { withReducer, withHandlers, compose, lifecycle } from 'recompose'; // Mock Configuration function fe…

在使用React时,会经常需要处理state里边设置的初始值以达到我们的实际需求,比如从接口获取到列表数据后要赋值给定义的列表初始值,然后数据驱动view视图进而呈现在我们眼前,这种最简单的赋值方式实现起来也很简单,如下: this.setSate({ listData: res.data }) 其实VUE实现起来更简单,直接写成this.listData = res.data即可,这里不做过多vue的赘述. 那么在使用React时你有没有想过如果是给一个数组中的某一项重新赋值呢?如果给一个Ob…

Events are the beginning of most every stream. Recompose provides a createEventHandler function to help your create handler and stream pairs. Once the handler/stream pairs are created, it’s simply a matter of passing the handlers down the stream as p…