前言

我发现React和AngularJS思想完全不同，AngularJS是基于双向绑定，在Modal层中定制数据，然后双向改变。但是React是通过prop和state来改变view层的状态。下面是我写的一个轮播图组件，可以直接看一下。代码很简单。原理就是通过React在componentDidMount后改变setState，来动态改变css样式。

说明以下：看gif很卡，但是实际效果还是很好的。

以下是示例代码

LunBo.js

require('styles/App.css'); require('normalize.css/normalize.css'); import React from 'react'; import ReactDOM from 'react-dom' const LunBo=React.createClass({ propsTypes:{ interval:React.PropTypes.number, autoPlay:React.PropTypes.bool, activeIndex:React.PropTypes.bool, defaultActiveIndex:React.PropTypes.bool, direction:React.PropTypes.oneOf['right','left'], number:React.PropTypes.number, boxStyle:React.PropTypes.string, }, getDefaultProps(){ return{ interval:3000, autoPlay:true, defaultActiveIndex:0, direction:'right' } }, getInitialState(){ return{ activeIndex:this.props.defaultActiveIndex?this.props.defaultActiveIndex:0, direction:this.props.direction?this.props.direction:'right' } }, componentDidMount(){ this.autoPlay(); }, componentWillReceiveProps (){ }, componentWillUnmount(){ clearInterval(this.timeOuter); }, autoPlay(){ if(this.props.autoPlay){ if(this.props.direction==="right"){ this.timeOuter=setInterval(this.playRight,this.props.interval); }else if(this.props.direction==="left"){ this.timeOuter=setInterval(this.playLeft,this.props.interval); } } }, playRight(indexIn){ let index=indexIn?indexIn:this.state.activeIndex+1; console.log(index); if(index>this.props.number-1){ index=0; } this.setState({ activeIndex:index }) }, playLeft(indexIn){ let index=indexIn?indexIn:this.state.activeIndex-1; console.log(index); if(index<0){ index=this.props.number-1; } this.setState({ activeIndex:index }) }, position(){ switch (this.state.activeIndex){ case 0:return "onePosition" ; case 1:return "twoPosition" ; case 2:return "therePosition" ; case 3:return "fourPosition"; } }, left(){ clearInterval(this.timeOuter); let oldIndex=this.props.activeIndex; this.playLeft(oldIndex+1); this.autoPlay(); }, right(){ clearInterval(this.timeOuter); let oldIndex=this.props.activeIndex; this.playRight(oldIndex-1); this.autoPlay(); }, render(){ let{ interval, autoPlay, activeIndex, defaultActiveIndex, direction, number, boxStyle }=this.props; return <div className={boxStyle} > <span className="leftIcon" onClick={this.left}>left</span> <span className="rightIcon" onClick={this.right}>right</span> <ul className={this.position()}> {this.props.children} </ul> </div> } }); export default LunBo;

index.js

import 'core-js/fn/object/assign';import React from 'react'; import ReactDOM from 'react-dom'; import LunBo from './components/Lunbo'; ReactDOM.render(<LunBo interval={100} number={4} boxStyle="content" interval={4000} > <li className="boxStyleLi"></li> <li className="boxStyleLi"></li> <li className="boxStyleLi"></li> <li className="boxStyleLi"></li></LunBo> ,document.getElementById('app'));

App.css

.content{ width: 400px; height: 400px; border: 3px solid saddlebrown; position: relative; overflow: hidden; } .content ul{ display: block; width: 2500px; height: 100%; float:left; position: absolute; z-index: 0; -webkit-transition: all 0.5s; -moz-transition: all 0.5s; -ms-transition: all 0.5s; -o-transition: all 0.5s; transition: all 0.5s; } .boxStyleLi{ display: inline-block; width: 400px; height: 400px; float: left; } .boxStyleLi img{ width: 100%; height: 100%; } .spanStyle{ width: 500px; height: 400px; border: 3px solid #598b3a; background: #7177eb; position: relative; } .onePosition{ left: 0; } .twoPosition{ left: -400px; } .therePosition{ left: -800px; } .fourPosition{ left: -1200px; } .leftIcon{ width: 50px; height: 50px; background: #cd4d5c; position: absolute; left: 0; top: 350px; text-align: center; line-height: 50px; z-index: 999; } .rightIcon{ width: 50px; height: 50px; background: #f6403d; position: absolute; left: 350px; top: 350px; text-align: center; line-height: 50px; z-index: 999; }

总结

通过React这一门框架的学习，你可以从它独特的新特性中发掘一种新的思维模式。以上就是这篇文章的全部内容，希望对大家的学习或者工作能带来一定的帮助，如果有疑问可以留言交流。