React笔记

React JS Tutorials for Beginners - 1 - Getting Started  https://www.youtube.com/watch?v=-AbaV3nrw6E&list=PL6gx4Cwl9DGBuKtLgPR_zWYnrwv-JllpA 
Downloads: https://facebook.github.io/react/downloads.html
Sample code:https://github.com/buckyroberts/React-Boilerplate

browser.min.js: Convert jsx into javascript, jsx转换网站https://babeljs.io/repl/

React JS Tutorials for Beginners - 2 - Simple Demo  https://www.youtube.com/watch?v=2NLgQMs2hOw&index=2&list=PL6gx4Cwl9DGBuKtLgPR_zWYnrwv-JllpA
Sample Demo:
<div id="example"></div>

<script type="text/babel">  //注意是txt/babel
    ReactDOM.render(<h1>Hello World</h1>,document.getElementById('example'));  //将Html代码填充到指定的div中
</script>

3.
Components:
<div id="example"></div>

<script type="text/babel">  
    var Bacon=React.createClass({  //createClass创建component
            render: function(){
                    return (<div>  //只能返回一个父元素
                                <h2>This is a simple component!</h2>
                                <p>This is a simple component!</p>
                            </div>
                            );                
            }        
    });

    ReactDOM.render(<Bacon />,document.getElementById('example'));    
    //ReactDOM.render(<div><Bacon /><Bacon /><Bacon /></div>,document.getElementById('example'));   //呈现多个Component
</script>

4. Props (Property)
<div id="app"></div>

<script type="text/babel">  
    var Movie=React.createClass({  //createClass创建component
            render: function(){
                    return (<div>  
                                <h1>{this.props.title}</h1>
                                <h2>{this.props.genre}</h2>
                            </div>
                            );                
            }        
    });
    //ReactDOM.render(<Movie />,document.getElementById('app'));    
    ReactDOM.render(<div>
                        <Movie title="Avatar" genre="action" />
                        <Movie title="The Notebook" genre="romance" />
                        <Movie title="Captain America" genre="action" />
                    </div>,document.getElementById('app'));   //呈现多个Component
</script>

5. Event Handling
<div id="container"></div>

<script type="text/babel">  
    var Comment=React.createClass({  //createClass创建component
            edit: function(){
                alert("edit");
            },
            remove: function(){
                alert("remove");
            },
            render: function(){
                    return (<div className="commentContainer">  //注意是className
                                <div className="commentText">{this.props.children}</div>  //this.props.children显示下面<Comment></Comment>之间的内容
                                <button onClick={this.edit} className="button-primary">Edit</button>   //事件处理onClick={this.edit}
                                <button onClick={this.remove} className="button-danger">Remove</button>
                            </div>
                            );                
            }        
    });
    
    ReactDOM.render(<div className="board">
                        <Comment>Hey my name is Steve</Comment>
                        <Comment>Jack</Comment>
                        <Comment>Amy</Comment>
                    </div>,document.getElementById('container')); 
</script>

6. State
<div id="container"></div>

<script type="text/babel">  
    var Checkbox=React.createClass({  //createClass创建component
        getInitialState: function(){  //getInitialState设置初始状态
            return {checked:ture}            
        },
        handleChecked: function(){
            this.setState({checked: !this.state.checked}); //setState设置状态
        },
        render:function(){
            var msg;
            if(this.state.checked){
                msg="checked"
            }else{
                msg="unchecked"
            }
            return (<div>
                        <input type='checkbox' onChange={this.handleChecked} defaultChecked={this.state.checked} />  ////defaultChecked绑定初始状态
                        <h2>Checkbox is {msg}</h2>
                    </div>);
        }
        
    });
    
    ReactDOM.render(<Checkbox />,document.getElementById('container'));
</script>

7. Adding State to Components
<div id="container"></div>

<script type="text/babel">  
    var Comment=React.createClass({  //createClass创建component
            getInitialState: function(){  
                    return {editing:false}    //编辑状态为false        
                },
            edit: function(){
                this.setState({editing:true});  //设置编辑状态为true
            },
            remove: function(){
                alert("remove");
            },    
            save: function(){
                var val=this.refs.newText.value;  //用ref来获取输入框中的值
                this.setState({editing:false});
            },
            renderNormal: function(){
                return (<div className="commentContainer">  
                            <div className="commentText">{this.props.children}</div>  
                            <button onClick={this.edit} className="button-primary">Edit</button>   
                            <button onClick={this.remove} className="button-danger">Remove</button>
                        </div>
                        );    
            },
            renderForm: function(){
                return (<div className="commentContainer">  
                            <textare ref="newText" defaultValue={this.props.children}></textare>  //注意defaultValue, 如果给id会导致很多重名,用ref来获取输入框中的值
                            <button onClick={this.save} className="button-success">Save</button>
                        </div>
                        );    
            },
            render: function(){
                            if(this.state.editing){
                                return this.renderForm();
                            }else{
                                return this.renderNormal();
                            }
            }        
    });

    
    ReactDOM.render(<div className="board">
                        <Comment>Hey my name is Steve</Comment>
                        <Comment>Jack</Comment>
                        <Comment>Amy</Comment>
                    </div>,document.getElementById('container')); 
</script>


8. Multiple Child Components (在一个容器内排序多个Components)
<div id="container"></div>

<script type="text/babel">  
    var Comment=React.createClass({  
            getInitialState: function(){  
                    return {editing:false}    //编辑状态为false        
                },
            edit: function(){
                this.setState({editing:true});  //设置编辑状态为true
            },    
            remove:function(){
                this.props.deleteFromBoard(this.props.index);  //调用外层属性deleteFromBoard
            }
            save: function(){
                var val=this.refs.newText.value;  //用ref来获取输入框中的值
                this.props.updateCommentText(val,this.props.index);  //调用外层属性updateCommentText
                this.setState({editing:false});
            },
            renderNormal: function(){
                return (<div className="commentContainer">  
                            <div className="commentText">{this.props.children}</div>  
                            <button onClick={this.edit} className="button-primary">Edit</button>   
                            <button onClick={this.remove} className="button-danger">Remove</button>
                        </div>
                        );    
            },
            renderForm: function(){
                return (<div className="commentContainer">  
                            <textare ref="newText" defaultValue={this.props.children}></textare>  //注意defaultValue, 如果给id会导致很多重名,用ref来获取输入框中的值
                            <button onClick={this.save} className="button-success">Save</button>
                        </div>
                        );    
            },
            render: function(){
                            if(this.state.editing){
                                return this.renderForm();
                            }else{
                                return this.renderNormal();
                            }
            }        
    });

    var Board=React.createClass({  //Comment是组件,组件可以有很多个.Board是组件外面的容器用于管理里面的多个组件.
        getInitialState:function(){
            return{
                comments:[
                        'aaaaaa',
                        'bbbbbb',
                        'cccccc'
                ]
            }
        },
        add:function(text){
            var arr=this.state.comments;
            arr.push(text);   //push,把元素加入数组
            this.setState({comments:arr});
        },
        removeComment: function(i){   
                var arr=this.state.comments;
                arr.splice(i,1); //从第i个开始,去掉1个元素.返回新的数组.
                this.setState({comments:arr});
            },
        updateCommand:function(newText,i){
            var arr=this.state.comments;
            arr[i]=newText;  //将新值赋值给数组中指定的元素
            this.setState({comments:arr}); //更新数组,将新数组arr更新到comments中
        }
        eachComment:function(text,i){  
                        return (
                        <Comment key={i} index={i} updateCommentText={this.updateComment} deleteFromBoard={this.removeComment}>  //注意关键字 key和index, 以及自定义属性updateCommentText,deleteFromBoard
                        {text}
                        </Comment>
                        );  
                    },
        render:function(){
            return(
                <div>
                    <button onClick={this.add.bind{null,'some default text'}} className="button-info Create">Add New</button>    //注意写法onClick={this.add.bind{null,'some default text'}}
                    <div className="board">
                        {
                            this.state.comments.map(this.eachComment)  //map相当于for循环
                        }
                    </div>
                </div>
            );
        };
        
    });
    
    ReactDOM.render(<Board />,document.getElementById('container')); 
</script>
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constructor(){
    super();
    this.state={name: "Will"};
}

this.setState({name:"Bob"});

changeTitle={this.changeTitle.bind(this)}  //changeTitle方法在当前js文件中需要用.bind(this)

REACT JS TUTORIAL #6 - React Router & Intro to Single Page Apps with React JS   https://www.youtube.com/watch?v=1iAG6h9ff5s&index=6&list=PLoYCgNOIyGABj2GQSlDRjgvXtqfDxKm5b

Bootstrap模版: startbootstrap.com
安装react router的命令: npm install -S react-router

Store类似于Angularjs中的Service.

componentWillMount(){//Component的构造函数
    TodoStore.on("change",this.getTodos);
}
componentWillUnmount(){ //必须卸载这个方法,不然会导致内存泄露.
    TodoStore.removeListener("change",this.getTodos);
}

npm install -S flux

Actions -> Dispatcher -> Stores -> Components -> Actions.

import * as TodoAcions from "../action/TodoAcions";  //表示TodoActions中的所有方法.

Ajax: axios("http://someurl.com/somedataendpoint").then((data)=>{
    console.log("got the data!",data);
});

Redux核心概念有三个：actions,store,reducers.

Immutable JS - Redux Tutorial #2 - React.js Tutorial  https://www.youtube.com/watch?v=9M-r8p9ey8U&list=PLoYCgNOIyGABj2GQSlDRjgvXtqfDxKm5b&index=16
var a={name:"Will", things:[0,1,2]}
var b=Object.assign({},a,{name:"Fred"})
b.things=a.things.concat(3)

state={...state,age:action.payload}

Redux Middleware Tutorial - Redux Tutorial #5   https://www.youtube.com/watch?v=DJ8fR0mZM44&list=PLoYCgNOIyGABj2GQSlDRjgvXtqfDxKm5b&index=19
中间件: import {applyMiddleware,createStore} from "redux";
const logger=(store)=>(next)=>(action)=>{
    console.log("action fired",action);
    next(action);
}
const store=createStore(reducer,1,middleware)

Connecting React & Redux - Redux Tutorial #7     https://www.youtube.com/watch?v=nrg7zhgJd4w&index=21&list=PLoYCgNOIyGABj2GQSlDRjgvXtqfDxKm5b
import {connect} from "react-redux"

@connect((store)=>{
    return{
        user:store.user.user,
        userFetched:store.user.fetched,
        tweets:store.tweets.tweets,
    };
})
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ReactJS / Redux Tutorial - #1 Introduction     https://www.youtube.com/watch?v=qrsle5quS7A&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_     
npm install redux -save //安装redux

js中的对象:
const initialState = {
    result:1,  
    lastValues:[]
}

state = {
    ...state,  //ES6语法,包括state对象的所有属性
    result: state.result + action.payload,
    lastValues: [...state.lastValues,action.payload]
}

ReactJS / Redux Tutorial - #5 Multiple Reducers     https://www.youtube.com/watch?v=BVvBa18o8Es&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_&index=5
import {createStore, combineReducers} from "redux"
const store = createStore(combineReducers({mathReducer,userReducer}));

ReactJS / Redux Tutorial - #6 Redux Middleware   https://www.youtube.com/watch?v=AgO7YcJeBh4&index=6&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
import {createStore, combineReducers, applyMiddleware} from "redux"
const myLogger = (store) => (next) => (action) => {
    console.log("Logged Action",action);
    next(action);
}
const store = createStore(combineReducers({mathReducer,userReducer}), {}, applyMiddleware(myLogger));

npm install redux-logger --save
import logger from "redux-logger";
const store = createStore(combineReducers({mathReducer,userReducer}), {}, applyMiddleware(logger()));


ReactJS / Redux Tutorial - #7 Connect ReactJS and Redux  https://www.youtube.com/watch?v=tfuZ7uZmVyg&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_&index=7
npm install react-redux --save
import {connect} from "react-redux";
import {Provider} from "react-redux";
<Provider store={store}>
    <App/>
</Provider>

const mapStateToProps = (state) => {
    return {
        user: state.userReducer,
        math: state.mathReducer
    }
}

const mapDispatchToProps = (dispatch) => {
    return {
        setName:(name)=>{
            dispatch({
                type:"SET_NAME",
                payload: name
            });
        }
    }
}

export default connect(mapStateToProps,mapDispatchToProps)(app);

<Main changeUsername={()=>this.props.setName("Anna")} />
<User username={this.props.user.name} />

ReactJS / Redux Tutorial - #8 Containers & Components (Smart & Dumb Components)   https://www.youtube.com/watch?v=m2q3Dyr6To4&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_&index=8
Dumb Components 只是方法不是类, 只需要return html不需要render.
Smart Components放在containers文件夹下, Dumb Components放在components下.

ReactJS / Redux Tutorial - #9 A better Project Structure    https://www.youtube.com/watch?v=YmGm-qwbJdc&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_&index=9
app 
    actions, components, containers(app.js), reducers
index.js
store.js

ReactJS / Redux Tutorial - #10 Async Actions   https://www.youtube.com/watch?v=h892pHdLQtM&index=10&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
npm install redux-thunk --save
import thunk from "redux-thunk";
applyMiddleware(logger(),thunk)

npm install redux-promise-middleware --save
import promise from "redux-promise-middleware";
applyMiddleware(logger(),thunk,promise())
return {
    type:"SET_NAME",
    payload:new Promise((resolve, reject) => {
        setTimeout(()=>{
            resolve(name);
        },2000);
    })
}
Reducer.js中 case "SET_NAME_FULFILLED" //因为这个promise中间件,需要加上_FULFILLED
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Learning React.js [1] - An Overview  https://www.youtube.com/watch?v=vYldnghykaU&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
when a state is changed, the component is re-rendered and markup will be updated. This makes React very dynamic.

Lifecycle Methods:
render - Renders a component. The only one that is required.
getInitialState - You can set default values for your states.
getDefaultProps - Set defaults for properties.
componentWillMount - Invoked once on client & server before render.
componentDidMount - Invoked after the first render.

React Addons:
Collection of modules that aid in developing React.js applications
Animation Addons
2 Way Data Binding Addons - React Link
Testing Addons

Learning React.js [2] - Your First Component   https://www.youtube.com/watch?v=mDz4HXZHo9g&index=3&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
React网址: https://facebook.github.io/react/docs/getting-started.html

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://fb.me/react-0.14.7.js"></script>
<script src="https://fb.me/react-dom-0.14.7.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.25/browser.min.js"></script>
<script type="text/babel">
    ...
</script>

Learning React.js [3] - Adding Properties    https://www.youtube.com/watch?v=euSbXxCf88I&index=2&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
propTypes:{
    title:React.PropTypes.string.isRequired
},
getDefaultProps: function(){
    return {
        title: "111",
        text: "222",
        link:"333"
    }
}

Learning React.js [4] - Events  https://www.youtube.com/watch?v=CVigtRUxj2I&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO&index=4
<a onClick={this.OnClick.bind(this, 'Hello','Goodbye')}>  //带参数的function
onClick: function(msg,msg2){
    alert(msg2);  //弹出Goodbye
}

Learning React.js [5] - State and Nesting Components   https://www.youtube.com/watch?v=_o9NTYfbkR0&index=6&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
getInitialState: function(){
    return {
        text: 'Hello World'
    }
}

<h1>{this.state.text}</h1>

<input type="text" onChange={this.changeText} value={this.state.text} />
changeText: function(e){
    this.setState({text: e.target.value});   //setState, e.target.value
}

Learning React.js [6] - Mapping Data   https://www.youtube.com/watch?v=499IaPWLHKU&index=5&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
React中的循环:
<ul className="list-group">
    {
        this.props.todos.map(todo => {
            return <li className="list-group-item" todo={todo} key={todo.id}>{todo.name}</li>
        })
    }
<ul>

Learning React.js [7] - Adding State Data Through a Form   https://www.youtube.com/watch?v=yOu_PUAOtP0&index=7&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
App component:
<TodoForm onTodoAdd={this.handleTodoAdd} />

handleTodoAdd: function(text){
    var newTodo={
        id: this.state.todos.length + 1,
        text: text
    }
    this.setState({todos: this.state.todos.concat(newTodo)});  //concat向数组里面添加对象
}

TodoForm component:
<form onSubmit={this.onSubmit}>
    <input type="text" ref="text" onChange={this.onChange} className="form-control" />  //ref="text"
</form>
onSubmit:function(e){   //e参数, refs
    e.preventDefault();
    var text = this.refs.text.value.trim();
    if(!text){
        alert('Please enter a todo');
        return;
    }
    this.props.onTodoAdd(text);  //调用传过来的props方法onTodoAdd()
    this.refs.text.value='';
}

Learning React.js [8] - Deleting State Data  https://www.youtube.com/watch?v=AUso8hw2-JQ&index=8&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
<TodoList todos={this.state.todos} deleteTodo={this.handleTodoDelete} />  //这里的handleTodoDelete不用指定参数

handleTodoDelete: function(todo){
    var todos = this.state.todos;
    for(var i=0;i<todos.length;i++){
        if(todos[i].id==todo.id){
            todos.splice(i,1);
        }
    }
    this.setState({todos: todos});
}

<a onClick={this.onDelete.bind(this,todo)} >
onDelete(todo){
    this.props.deleteTodo(todo);
}

Learning React.js [9] - Updating State Data   https://www.youtube.com/watch?v=WI8Z1RKzhMM&index=9&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO
<TodoForm {...this.state} onTodoAdd={this.handleTodoAdd} />  //{...this.state}会把整个state传到控件TodoForm中,TodoForm控件中用{this.props.text}来获得state中的值.
<TodoList 
//todos={this.state.todos}
{...this.state}   //{...this.state}会把整个state传到该控件中
editTodo={this.handleTodoEdit} />

handleTodoEdit: function(todo){
    this.setState({text:todo.text, isEdit: todo.id});
} 


<span onClick={this.editTodo.bind(this,todo)}>

editTodo: function(todo){
    this.props.editTodo(todo);
}

<TodoForm
{...this.state}
changeText={this.handleChangeText}
onTodoUpdate={this.handleTodoUpdate} />

handleChangeText: function(text){
    this.setState({text: text});
}

handleTodoUpdate: function(todo){
    var todos = this.state.todos;
    for(var i=0;i<todos.length;i++){
        if(todos[i].id==todo.id){
            todos.splice(i,1);
        }
    }
    todos.push(todo);
    this.setState({todos: todos});
}

TodoForm 组件中: 
<input type="text" onChange={this.onChange}>
onChange: function(e){
    this.props.changeText(e.target.value);  //input没有onChange方法, 没有this.props.changeText的话input中的值输入会没有变化
}

onSubmit方法中:
if(this.props.isEdit){
    var updateTodo = {
        id: this.props.isEdit,
        text:text
    }
    this.props.onTodoUpdate(updatedTodo);
}else{
    this.props.onTodoAdd(text);
}

Learning React.js [10] Persisting Data To Firebase  https://www.youtube.com/watch?v=QY7Ibl37_08&list=PLillGF-RfqbbKWfm3Y_RF57dNGsHnkYqO&index=10
页面代码中添加: <script src="https://cdn.firebase.com/js/client/1.0.17/firebase.js"></script>
componentWillMount: function(){
    this.firebaseRef = new Firebase('https://todolistdev1.firebaseio.com/todos');
    var that = this;
    this.firebaseRef.once("value", function(snapshot){  //Get todo list from database
        var todos = [];
        snapshot.forEach(function(data){
            var todo = {
                id: data.val().id,
                text: data.val().text
            }
            todos.push(todo);
            that.setState({todos: todos});
        });
    });
}

Add: this.firebaseRef.push(newTodo);
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React & Express Starter Pack For Full Stack Development   https://www.youtube.com/watch?v=v0t42xBIYIs
项目模版的使用:
git clone https://...
npm install
npm run client-install
npm run dev //会同时启动客户端和服务端,因为使用了模块concurrently. localhost:3000打开客户端, localhost:5000/api/customers打开服务端.

创建项目:
mkdir reactexpress 
cd reactexpress
npm init
npm i express concurrently
npm i nodemon --save-dev
package.json文件修改:
"scripts":{
    "start":"node server.js",
    "server":"nodemon server.js"
}
touch server.js //创建文件
code server.js //用vs code打开文件
npm run server //启动服务端

打开另外一个命令窗口: npm i -g create-react-app  //安装react的cli
create-react-app client //创建react项目放在client下
打开client>package.json文件添加节点"proxy":"http://localhost:5000"指定服务端地址.
npm start //启动react客户端

npm run dev同时启动客户端和服务端, 修改server端下面的package.json文件:
"scripts":{
    "client-install":"cd client && npm install",
    "start":"node server.js",
    "server":"nodemon server.js",
    "client":"npm start --prefix client",
    "dev":"concurrently "npm run server" "npm run client""
}

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React JS Crash Course    https://www.youtube.com/watch?v=A71aqufiNtQ
官网: https://facebook.github.io/rect
npm install -g create-react-app
create-react-app projectmanager  //创建项目命令
npm start

React使用的语法叫JSX.

生成GUID的插件:
npm install --save uuid
npm start

import uuid from 'uuid';
uuid.v4(); //生成GUID

安装jquery: npm install jquery --save
npm start
import $ from 'jquery';

react里面不用name用ref?
<input type="text" ref="title">
if(this.refs.title.value === '')  
    
child component: this.props.addProject(this.state.newProject);
father component: <AddProject addProject={this.handleAddProject.bind(this)} />
handleAddProject(project){
    console.log(project);
}

handleDeleteProject(id){
    let projects=this.state.projects;
    let index=projects.findIndex(x=>x.id===id); //findIndex找到要删除元素的序列号
    projects.splice(index,1);
    this.setState({projects:projects});
}

类型验证:
Projects.propTypes={
    projects:React.PropTypes.array,
    onDelete:React.PropTypes.func
}

setState有返回函数:
this.setState({todos:data},function(){
    console.log(this.state);
});

state在构造函数中初始化, 在componentWillMount中赋值.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The 2017 React Development Starter Guide  https://www.youtube.com/watch?v=7ojad6QYuqI
Add Todo:
this.state={
    todoTitle:''
}
this.handleInputChange=this.handleInputChange.bind(this); //放在构造函数里面?

handleInputChange(event){
    const target = event.target;
    const target = event.target;
    const target = event.target;
    
    this.setState({
        [name]:value
    })
}

handleSubmit(event){
    event.preventDefault();
    this.props.onAddTodo(this.state);
    this.setState({
        todoTitle:''
    });
}

<form onSubmit={this.handleSubmit.bind(this)}>
    <input type="text" id="inputTodoTitle" 
    name="todoTitle"  //可以有name
    value={this.state.todoTitle} //绑定上面的todoTitle
    onChange={this.handleInputChange}   //没有这个方法输入不了
    />

父Component中:
handleAddTodo(todo){
    this.setState({todos:[...this.state.todos, todo]})
}
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Learn Redux - Introduction To State Management With React   https://www.youtube.com/watch?v=SGOFxK-28ns&index=1&list=PL2dKqfImstaSl8Hi6UrovwraEHvK2MNPt
Component > Action > Store <> Reducer 
npm add redux //在react项目中添加redux package
创建src>actions>index.js
One Action Example:
export const voteReact = () =>{
    return {
        type: 'VOTE_REACT'
    }
}

src>reducers>index.js
reducer example:
const initialState = {
    angular:0,
    react:0,
    vuejs:0
}
export default (state = initialState, action) => {
    switch(action.type){
        case 'VOTE_REACT':
            return Object.assign({},state,{
                react:state.react + 1
            })
        default:
            return state
    }
}

模版样式:https://bootswatch.com 选择Yeti, 加入public > Index.html 页面样式中.

App.js:
constructor(props){
    super(props);
    this.store = this.props.store;  //props是不是可以理解为parent?表示父控件中有属性store
}
handleVoteReact = ()=>{
    this.store.dispatch(voteReact());  //dispatch reducer
}

<div style={{'textAlign':'center'}}>  //内联样式用双引号

index.js:
let store = createStore(myApp);
function render(){
    ReactDOM.render(
        <App store={store} />,
        document.getElementById('root')
    );
}
store.subscribe(render);
render();

{this.voteAngularInPercent().toFixed(2) + '%'}  //这里的this.voteAngularInPercent()是function
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Using Chart.js With React  https://www.youtube.com/watch?v=Ly-9VTXJlnA
使用react-chartjs-2: https://github.com/gor181/react-chartjs-2
npm install -g create-react-app  //安装
create-react-app my-app  //创建项目
cd my-app
npm start

npm install react-chartjs-2 chart.js --save

默认属性:
static defaultProps={
    displayTitle:true,
    dsiplayLegend:true
}
使用: this.props.displayTitle 
<Chart displayTitle=false />  //这里的属性值会覆盖默认定义的属性值
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Full Stack React & LoopBack [1] - Intro & LoopBack Server  https://www.youtube.com/watch?v=Mx-cywTNy8s&list=PLillGF-RfqbZjJBAu0sx_0SCuFdzdx4iY&pbjreload=10
service mongod start //启动mongodb服务
LoopBack - The Node.js API Framework: https://loopback.io/
npm install -g loopback-cli
lb  //创建项目
node . //启动服务运行app

npm install --save loopback-connector-mongodb
lb datasource mongoDS --connector mongoDB  //会自动创建文件生成代码
lb model 按Enter键然后输入model name

Full Stack React & LoopBack [2] - React, Routing and UI  https://www.youtube.com/watch?v=idvCKXXFGs4&index=2&list=PLillGF-RfqbZjJBAu0sx_0SCuFdzdx4iY
创建文件夹client_src用于存放React项目, 编译后的文件存放于根目录下的clinet文件夹.
用vs code打开client_src文件夹.
create-react-app . //react项目创建于当前目录下
使用指定端口, 修改package.json文件:
"start":"set PORT=3001 && react-scripts start"  //添加了set PORT=3001 &&

google搜索react router v4,打开https://reacttraining.com/react-router/, 要使用左侧的<Switch>,<BrowserRouter>
npm install --save react-router react-router-dom
创建router: src > components > Main.js, 把Main放在App component中:<Main />

样式: materializecss.com/

Full Stack React & LoopBack [3] - Fetching & Displaying Meetups   https://www.youtube.com/watch?v=R3wiX05SJps&index=3&list=PLillGF-RfqbZjJBAu0sx_0SCuFdzdx4iY
npm install axios --save   //用于http通信

this.setState({meetups: response.data}, ()=>{  //setState有回调函数
    console.log(this.state);
});

<Link to={`/meetups/${this.state.item.id}`}> Home </Link>  //``符号内的变量${},EX6语法

获取页面地址栏传过来的参数: let meetupId = this.props.match.params.id;

Full Stack React & LoopBack [4] - Add, Edit & Delete Meetups   https://www.youtube.com/watch?v=yN5qKqLDlpM&list=PLillGF-RfqbZjJBAu0sx_0SCuFdzdx4iY&index=4
<input type="text" name="name" ref="name" />
console.log(this.refs.name.value);

this.handleInputChange = this.handleInputChange.bind(this);  //放在构造函数里面
handleInputChange(e){
    const target = e.target;
    const value = e.target.value;
    const name = e.target.name;
    this.setState({
        [name]:value
    });    
}
Edit页面: <input type="text" name="name" ref="name" value={this.state.name} onChange={this.handleInputChange}/>  //没有onChange的方法就不能修改

Full Stack React & LoopBack [5] - Front & Back End Integration  https://www.youtube.com/watch?v=M_PaFaIf6d8&index=5&list=PLillGF-RfqbZjJBAu0sx_0SCuFdzdx4iY
修改react的package.json文件: "build":"react-scripts build && cp -r build/* ../client/"    //执行npm run build将编译后的文件放到server端的client文件夹
vs code打开根项目文件夹,修改server > boot > root.js:
router.get('/',server.loopback.status()); 改为router.get('/');
middleware.json:
"files":{
    "loopback#static":{
        "params":"$!../client"
    }
}
node .  //启动项目
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Build & Deploy A React JS Text Generator App   https://www.youtube.com/watch?v=yU5DYccb77A
返回text的API: hipsterjesus.com
npm install axios --save  //axios网址 https://github.com/mzabriskie/axios
import axios from 'axios'

onChange(e){
    this.setState({value: e.target.value}, function(){  //e.target.value
        this.props.onChange(this.state.value);        
    })
}

<br />  //jsx语法中必须要有/,不能是<br>

npm run build //编译项目到build文件夹, 里面有个static文件夹
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ReactJS Basics - #2 Setup Workspace with Webpack   https://www.youtube.com/watch?v=uextYhQGP6k&list=PL55RiY5tL51oyA8euSROLjMFZbXaV7skS&index=2
npm init
npm install react react-dom --save
npm install webpack webpack-dev-server babel-loader babel-preset-es2015 babel-preset-react babel-preset-stage-2 --save-dev  //webpack-dev-server会自动刷新页面
根目录下创建webpack.config.js

git init
.gitignore:
    /node_modules
    /dist
    /npm-debug.log
git add .
git commit -m "initial commit, setup finished"
git checkout -b 01-setup  //创建分支?

react propTypes 说明文档: https://facebook.github.io/react/docs/reusable-components.html

Component内部属性:
<Home>
    <p>This is a paragraph!</p>
</Home>
{this.props.children}
Home.propTypes = {
    children: React.PropTypes.element.isRequired
}

<button onClick={() => this.onMakeOlder()} >  //事件的这种写法不需要绑定this

ReactJS Basics - #10 Stateless Components   https://www.youtube.com/watch?v=SEkfzqIgvTo&index=11&list=PL55RiY5tL51oyA8euSROLjMFZbXaV7skS
export const Header = (props) => {
    return (
        <p>{props.homeLink}</p>
    )
}

console.log("123",nextProps,nextState) //console.log跟Python里面的Print方法类似

ReactJS Basics - #15 React Router - Route Setup  https://www.youtube.com/watch?v=eofpZPRUnP8&list=PL55RiY5tL51oyA8euSROLjMFZbXaV7skS&index=16
npm install --save react-router
import {Router,Route,browserHistory,IndexRoute} from "react-router";
render(){
    return (
        <Router history={browserHistory}>
            <Route path={"/"} component={Root}>
                <IndexRoute component={Home} />
                <Route path={"user/:id"} component={User} />
                <Route path={"home"} component={Home} />
            </Route>
            <Route path={"home-single"} component={Home} />
        </Router>
    );
}
package.json:
"build"最后追加  --history-api-fallback

ReactJS Basics - #16 React Router - Navigation & Parameters  https://www.youtube.com/watch?v=5pt_igBTCsI&list=PL55RiY5tL51oyA8euSROLjMFZbXaV7skS&index=17
方法一:
import {Link} from "react-router";
<Link to={"/home"} activeStyle={{color:"red"}}>Home</Link>
<Link to={"/user/10"} activeClassName={"active"}>User</Link>
方法二:
import {browserHistory} from "react-router";
onNavigateHome(){
    browserHistory.push("/home");
}
<button onClick={this.onNavigateHome}>Go Home</button>
带参数:
{this.props.params.id}

React Router文档: https://github.com/reactjs/react-router-tutorial/tree/master/lessons
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ReactJS / Redux Tutorial - #3 Using Redux  https://www.youtube.com/watch?v=ZKCYqJu4n3s&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_&index=3
Start the Webpack Dev Server with npm run build and then visit http://localhost:8080
npm install redux --save

import {createStore} from "redux";
const reducer = (state,action) => {
    switch(action.type){
        case "ADD":
            state = state + action.payload;
            break;
        case "SUBTRACT":
            break;
    }
    return state;
};
const store = createStore(reducer,1);  //第二个参数1是初始的state
store.subscribe(()=>{
    console.log("Store updated!", store.getState());
});
store.dispatch({
    type: "ADD",
    payload: 10
});

ReactJS / Redux Tutorial - #4 Working with State and Immutability   https://www.youtube.com/watch?v=7bMTJxvEJiE&index=4&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
const initialState = {
    result:1,
    lastValues:[]
}
const reducer = (state = initialState,action) => {
    switch(action.type){
        case "ADD":
            //state.result += action.payload;
            state={
                ...state,  //获得old state
                result: state.result + action.payload,  //覆盖原result
                lastValues: [...state.lastValues, action.payload]  //数组里面用...
            }
            break;
        case "SUBTRACT":
            break;
    }
    return state;
};

ReactJS / Redux Tutorial - #5 Multiple Reducers   https://www.youtube.com/watch?v=BVvBa18o8Es&index=5&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
import {createStore, combineReducers} from "redux";
const store = createStore(combineReducers({mathReducer, userReducer}));  //createStore不能直接传递多个reducer参数,所以使用combineReducers

ReactJS / Redux Tutorial - #6 Redux Middleware  https://www.youtube.com/watch?v=AgO7YcJeBh4&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_&index=6
import {createStore, combineReducers, applyMiddleware} from "redux";  //applyMiddleware
const myLogger = (store) => (next) => (action) => {
    console.log("Logged Action: ", action);
    next(action);
}
const store = createStore(combineReducers({mathReducer, userReducer}),{}, applyMiddleware(myLogger));
实用的Middleware: npm install redux-logger --save
import logger from "redux-logger";
const store = createStore(combineReducers({mathReducer, userReducer}),{}, applyMiddleware(logger()));

ReactJS / Redux Tutorial - #7 Connect ReactJS and Redux   https://www.youtube.com/watch?v=tfuZ7uZmVyg&index=7&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
npm install react-redux --save
import {Provider} from "react-redux";
index.js:
import App from "./components/App";  //如果是default component这不需要{}, 例如这里是App而不是{App}
render(
    <Provider store={store}
        <App/>
    </Provider>,
    window.document.getElementById('app');
);
App.js:
import {connect} from "react-redux";

<Main changeUsername={()=>this.props.setName("Anna")}/>
<User username={this.props.user.name} />

const mapStateToProps = (state) => {
    return {
        user: state.user,  //key是属性, 这里的user是属性
        math: state.math
    }
}

const mapDispatchToProps = (dispatch) => {
    return {
        setName:(name)=>{
            dispatch({
                type:"SET_NAME",
                payload:name
            });
        }
    }
}

export default connect(mapStateToProps, mapDispatchToProps)(App);  //connect this component to store

ReactJS / Redux Tutorial - #8 Containers & Components (Smart & Dumb Components)  https://www.youtube.com/watch?v=m2q3Dyr6To4&index=8&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
Smart Component: know state. 放在Containers文件夹下
Dumb Component: unknow state. 放在Components文件夹下. 使用export const Main = (props) =>{}

ReactJS / Redux Tutorial - #9 A better Project Structure   https://www.youtube.com/watch?v=YmGm-qwbJdc&index=9&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
app文件夹下创建reducers,actions文件夹,创建store.js文件.

ReactJS / Redux Tutorial - #10 Async Actions  https://www.youtube.com/watch?v=h892pHdLQtM&index=10&list=PL55RiY5tL51rrC3sh8qLiYHqUV3twEYU_
npm install redux-thunk --save  //解决错误Actions must be plain objects. Use custom middleware for async actions.
store.js:
import thunk from "redux-thunk";
applyMiddleware(thunk)

userActions.js:
return {
    type:"SET_NAME",
    payload: new Promise((resolve, reject) => {
        setTimeout(()=>{
            resolve(name);
        },2000);
    });
}
npm install redux-promise-middleware --save
store.js:
import promise from "redux-promise-middleware";
applyMiddleware(promise())
userReducer修改action name to SET_NAME_FULFILLED //添加后缀_FULFILLED, 使用promise()的时候需要添加.

React | Redux 使用文档: redux.js.org/docs/basics/UsageWithReact.html
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ReactJS从入门到实战 11 11 表单元素   https://www.youtube.com/watch?v=hJxRcG1APbQ&t=653s&index=5&list=WL
var styles={  //styles是对象,定义在组件外面
    inputText:{
        100,
        fontSize:24  //这里是fontSize而不是font-size
    }
}

getInitialState:function(){
    return{
        input:'default'
    }
},
handleTextChange: function(evt){
    this.setState({'input': evt.target.value});
}

<input type='text' style={styles.inputText} value={this.state.input} onChange={this.handleTextChange} defaultValue={this.state.input}/>

<textarea style={styles.inputText} onChange={this.handleTextChange} defaultValue={this.state.input} />




----------------------------------------------------------------------------------------------------------------------------------------------------------------------
Redux Crash Course With React   https://www.youtube.com/watch?v=93p3LxR9xfM
VS Code插件： ES7 React/Redux/GraphQL/React-Native snippets
npm start //启动react dev server,打开localhost:3000
react component code snippet: 'rcc'.
'rfc' code snippet for function.

页面上有多个输入框：
<input type="text" name="title" onChange={this.onChange} value={this.state.title}/>

constructor中： this.onChange = this.onChange.bind(this);

constructor外render外： 
onChange(e){
    this.setState({[e.target.name]: e.target.value});
}

Add Post: //新增
<form onSubmit={this.OnSubmit.bind(this)}>
OnSubmit(e){
    e.preventDefault();
    const post={
        title:this.state.title,
        body:this.state.body
    }
    fetch('https://jsonplaceholder.typicode.com/posts',{
        method:'POST',
        headers:{
            'content-type':'application/json'
        },
        body:JSON.stringify(post)
    })
    .then(res=>res.json())
    .then(data=>console.log(data));
}

安装Redux相关插件: npm i redux react-redux redux-thunk
App.js导入Provider 和 store: 
import {Provider} from 'react-redux'; 
import store from './store';  //创建单独的store.js文件
内容包裹在<Provider>里面:
render(){
    return(
        <Provider store={store}>
            ...
        </Provider>
    );
}

错误'react-scripts' is not recognized as an internal or external command. 解决方案:npm install

redux官方文档地址: https://github.com/reactjs/redux/tree/master/docs/api

store.js:
import {createStore,applyMiddleware} from 'redux';
import thunk from 'redux-thunk';
import rootReducer from './reducers';
...

创建rootReducer, reducers/index.js:
import {combineReducers} from 'redux';
import postReducer from './postReducer';

export default combineReducers({
    posts: postReducer
});

export function fetchPosts(){
    return function(dispatch){
        ...
    }
}
简化后的写法是:
export const fetchPosts=()=>dispatch=>{...}

组件Posts.js中: import {connect} from 'react-redux';  //connect the store to the component
componentWillMount(){
    this.props.fetchPosts(); //props下的action
}

const mapStateToProps = state => ({
    posts: state.posts.items  //使用的时候用this.props.posts
});
export default connect(mapStateToProps,{fetchPosts})(Posts);  //如果没有mapStateToProps,则为null

import PropTypes from 'prop-types';
Posts.propTypes={
    fetchPosts:PropTypes.func.isRequired,
    posts:PropTypes.array.isRequired
}
谷歌Redux插件: Google搜索chrome extension redux 点击 Redux DevTools - Chrome Web Store
要使用以上插件,修改store.js:
import {createStore, applyMiddleware, compose} from 'redux';
const store = createStore(
    rootReducer,
    initialState,
    compose(
        applyMiddleware(...middleware),
        window.__REDUX_DEVTOOLS_EXTENSION__&& window.__REDUX_DEVTOOLS_EXTENSION__()
    )
);

Redux里面的state是application级别的,不是某个Component的state.
dispatch里面包括type和payload(要传递的值).

componentWillReceiveProps(nextProps){  //when it receives property from state 
    if(nextProps.newPost){
        this.props.posts.unshift(nextProps.newPost); //push会添加到数组的最后一位,unshift添加到数组的最前面
    }    
}
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