react-redux connect的使用

发布时间：2020-12-15 06:33:00 所属栏目：百科来源：网络整理

导读：actions counter const increment1 = () = { return { type : 'INCREMENT_COUNTER' ,}}; const decrement1 = () = { return { type : 'DECREMENT_COUNTER' }}; module . exports = { increment1,decrement1}; infoMember const setInfoMember = (payload) =

actions

counter

const increment1 = ()=> {
    return {
        type: 'INCREMENT_COUNTER',}
};
const decrement1 = ()=> {
    return {type: 'DECREMENT_COUNTER'}
};

module.exports = {
    increment1,decrement1
};

infoMember

const setInfoMember = (payload) => {
    return {
        type: 'SET_MEMBER_INFO',payload
    }
}

const changeInfo = (payload) => {
    return {
        type: 'CHANGE_INFO',payload
    }
}

module.exports = {
    setInfoMember,changeInfo
}

reducers

counter

export default function counter(state = 0,action) {
    switch (action.type) {
        case 'INCREMENT_COUNTER':
            return state + 1;
        case 'DECREMENT_COUNTER':
            return state - 1;
        default:
            return state
    }
};

infoMember

export default function infoMember(state = {},action) {
    let _state = Object.assign({},state);
    switch (action.type) {
        case 'SET_MEMBER_INFO':
            return action.payload;
        case 'CHANGE_INFO':
            _state.script = action.payload;
            return _state;
        default:
            return state;
    }
}

index.js

import { combineReducers } from 'redux'
import counter from './counter'
import infoMember from './infoMember'

//使用redux的combineReducers方法将所有reducer打包起来
const rootReducer = combineReducers({
    counter,infoMember
});

export default rootReducer;

App.js

import { connect } from 'react-redux'
import actions from '../actions/counter';
import actions2 from '../actions/infoMember';

import React,{Component} from 'react'

class Counter extends Component {
    constructor(props) {
        super(props);
        this.add = this.add.bind(this);
        this.reduce = this.reduce.bind(this);
        this.changeInfo = this.changeInfo.bind(this);
    }
    componentDidMount() {
        console.log(this.props.infoMember); // {}
    }
    add() {
        this.props.dispatch(actions.increment1());
        this.props.dispatch(actions2.setInfoMember({id: '9932939293',script: 'Try my best'}));
    }
    reduce() {
        this.props.dispatch(actions.decrement1());
    }
    changeInfo() {
        this.props.dispatch(actions2.changeInfo('Come on'));
    }
    render() {
        return (
            <div>
                <p>
                    Clicked: {this.props.counter} times
                    {' '}
                    <button onClick={this.add}>+</button>
                    {' '}
                    <button onClick={this.reduce}>-</button>
                    {' '}
                </p>
                <p onClick={this.changeInfo}>this.props.infoMember: {this.props.infoMember.id} - {this.props.infoMember.script}</p>
            </div>
        )
    }
}

// //将state.counter绑定到props的counter
// const mapStateToProps = (state) => {
// return {
// counter: state.counter
// }
// };
// //将action的所有方法绑定到props上
// const mapDispatchToProps = (dispatch,ownProps) => {
// return {
// add: (...args) => dispatch(actions.increment1(...args)),
// reduce: (...args) => dispatch(actions.decrement1(...args))
// }
// };

//通过react-redux提供的connect方法将我们需要的state中的数据和actions中的方法绑定到props上
export default connect(state => (state))(Counter)

入口文件

import React from 'react';
import ReactDom from 'react-dom';
import {Provider} from 'react-redux';
import {createStore} from 'redux';
import reducer from './reducers/index.js';
import App from './containers/App.js';

let store = createStore(reducer);

ReactDom.render(
    <Provider store={store}>
        <App/>
    </Provider>,document.getElementById('root')
);

index.html

<!DOCTYPE html>
<html lang="en">
<head>Counter</head>
<body>
<div id="root">
</div>
<script type="text/javascript" src="bundle.js" charset="utf-8"></script>
</body>
</html>

app.js

const express = require('express');
const path = require('path');
const bodyParser  = require('body-parser');
var app = express();

app.use(bodyParser.urlencoded({
    extended: true
}));

app.use(express.static(__dirname + '/public'));

app.use('/',function (req,res) {
    res.sendFile(path.resolve('./public/index.html'));
});

app.listen(3000,function () {
    console.log('server started at http://localhost:3000'); // eslint-disable-line no-console
});

module.exports = app;

webpack配置 webpack.config.js

var path = require('path');
var ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
    devtool: 'eval-source-map',//由bundle.js映射到origin文件，容易在浏览器调试
    entry: __dirname + "/public/src/main.js",output: {
        path: __dirname + '/public',filename: "bundle.js"
    },module: {
        /*test:  A regular expression that matches the file extensions that should run through this loader (Required).
         loader:  The name of the loader (Required).
         include / exclude:   Optional setting to manually set which folders and files the loader should explicitly add or ignore.
         query:  The query setting can be used to pass Additional options to the loader.
         */
        loaders: [
            {
                test: /.(js|jsx)$/,//一个匹配loaders所处理的文件的拓展名的正则表达式，这里用来匹配js和jsx文件（必须）
                exclude: /node_modules/,//屏蔽不需要处理的文件（文件夹）（可选）
                loader: 'babel-loader',query: {
                    presets: ['es2015','react']
                }
            },{test: /.css$/,loader: "style-loader!css-loader"},{test: /.png$/,loader: "file-loader"},{test: /.jpg$/,loader: "file-loader"}
        ]
    }
};

（编辑：李大同）

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