【JAVASCRIPT】React + Redux

摘要

Redux 数据流图

  1. View 层由React 控制, 根据state 变化 刷新渲染组件,作用是根据更新的数据重新渲染组件
  2. Stroe 层其实就是state存储器,作用是更新数据
  3. Dispatch 层根据action 更新 state, 作用是分发事件
  4. Action 层绑定action类型和参数,并传递给dispatcher, 作用是通知有事件发生

这样保证预知组件的每个动作,并对每个动作做出相应的更新变化。

实战

html 部分

<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<title>demo</title>
</head>
<body>
	<div id="container"></div>

	<script type="text/javascript" src="bundle/app.js"></script>
</body>
</html>

app.js

var Redux = require('redux');
var React = require('react');
var ReactDOM = require('react-dom');

// action creator
var addTodoActions = function(text){
	return {
		type: 'add_todo',
		text: text
	};
};

// reducers
var todoReducer = function(state, action){

	if(typeof state === 'undefined'){
		return [];
	}

	switch(action.type){
		case 'add_todo':
			return state.slice(0).concat({
				text: action.text,
				completed: '未完成'
			});
			break;
		default:
			return state;
	}
};


var store = Redux.createStore(todoReducer);

var App = React.createClass({
	getInitialState: function(){
		return {
			items: store.getState()
		};
	},
	componentDidMount: function(){
		var unsubscribe = store.subscribe(this.onChange);
	},
	onChange: function(){
		this.setState({
			items: store.getState()
		});
	},
	handleAdd: function(){
		var input = ReactDOM.findDOMNode(this.refs.todo);
		var value = input.value.trim();

		if(value)
			store.dispatch(addTodoActions(value));

		input.value = '';
	},
	render: function(){
		return (
			<div>
				<input ref="todo" type="text" placeholder="输入todo项" style={{marginRight:'10px'}} />
				<button onClick={this.handleAdd}>点击添加</button>
				<ul>
					{
						this.state.items.map(function(item){
							return <li>{item.text} | 完成状态: {item.completed}</li>;
						})
					}
				</ul>
			</div>
		)
	},
});

ReactDOM.render(
	<App />,
	document.getElementById('container')
);


posted @ 2016-07-10 16:55  空城夕  阅读(266)  评论(0编辑  收藏  举报