[TOC]
`npm i redux -s`或`yarn add redux`
~~~
在chrome商店中安装redux
~~~
目录结构
## 1.定义store管理哪些数据
```
import {createStore} from 'redux';
```
## 2.定义reducer放置数据
```
var defaultState={
inputValue:"hello world",
list:[]
}
export default (state=defaultState,action)=>{
if(action.type==="inputChange"){
var newState = {...state};
newState.inputValue = action.value;
return newState;
}
return state;
}
```
## 3.将reducer中的数据和store通信
```
import reducer from './reducer';
const store = createStore(reducer,window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__());
export default store;
```
## 4.在app.js中用使用store中的数据
```
import store from './store/index.js';
class App extends Component {
constructor(props){
super(props);
this.state = store.getState()
}
}
```
## 5.事件派发action给store
```
handleChange=(event)=>{
var action ={
type:"inputChange",
value:event.target.value
}
store.dispatch(action);
}
```
## 6.在reducer中改变state
```
var defaultState={
inputValue:"hello world",
list:[]
}
export default (state=defaultState,action)=>{
if(action.type==="inputChange"){
var newState = {...state};
newState.inputValue = action.value;
return newState;
}
return state;
}
```
## 7.组件订阅store的改变
```
constructor(props){
super(props);
this.state = store.getState()
/* 只要store的状态发生改变的时候就会触发 */
store.subscribe(this.handleStoreChane)
}
handleStoreChane=()=>{
this.setState(store.getState())
}
}
```
