关于redux的一个问题

Question

1.我在main.js里边创建了store

let store = createStore(reducers, initState);

store.subscribe(() => {
    console.log(store.getState());
})

export default store;

2.我用Provider将store传进context

reactDom.render(
    <Provider store={ store }>
        <Root/>
    </Provider>,
    document.getElementById("main")
);

3.我在子页面可以拿到store，但是dispatch之后，store变了，却没有触发state更改并更新试图，这是什么原因呢？

Answer 1

Question组件内是不是没有connect到store?

const mapStateToProps = (state) => {
  return {
    step: state.step
  }
}

export default connect(mapStateToProps, null)(Question)

Answer 2

因为你的subscribe里面只是打印了state，并没有监听组件，所以你需要监听一下最外层的render方法

Answer 3

import React, {PropTypes, Compenteds} from "react";
import { connect } from 'react-redux';
const PropTypes = {}
class Stroe extends Compenteds {
constructor(){super(props)}
render(){return(<div>填写虚拟DOM</div>)}}
this.propTypes = PropTypes;
const mapStateToProps = (state) => ({});
const mapDispatchToProps = (Dispatch) => ({});
export default connect(mapStateToProps, mapDispatchToProps)(Stroe)；