每日短讯：react 怎么实现淡入淡出

(资料图片仅供参考)

本教程操作环境：Windows10系统、react18.0.0版、Dell G3电脑。

react 怎么实现淡入淡出？

react实现淡入淡出

首先要下载一个库，即npm i react-addons-css-transition-group,接下来看代码

//Pic.jsimport React,{Component} from "react"import Img1 from "../../image/1.jpg"import Img2 from "../../image/2.jpg"import Img3 from "../../image/3.jpg"import Image from "./Image"import Dot from "./Dot"import "./pic.css"class Pic extends Component{    constructor(props){        super(props)        this.state={current:0,            src:[Img1,Img2,Img3]        }        this.timer=null;    }    componentDidMount(){        this.timer=setInterval(()=>{            this.setState((prev)=>{return{current:(prev.current+1)%3}})        },3000)    }    clear(){        clearInterval(this.timer);    }//鼠标移入结束动画    start(){        this.timer=setInterval(()=>{            this.setState((prev)=>{return{current:(prev.current+1)%3}})        },3000)    }//鼠标移出开始动画    change=(i)=>{        console.log(i)        this.setState({current:i})    }//鼠标点击原点切换图片    render(){        return(                                
)    }}export default Pic
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Image.jsimport React,{Component} from "react"import CSSTransitionGroup from "react-addons-css-transition-group";import "./pic.css"class Image extends Component{    constructor(props){        super(props)    }    render(){        return(                                            
        )    }}export default Image
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Dot.jsimport React ,{Component} from "react"class Dot extends Component{    constructor(props){        super(props)        this.state={arr:[1,2,3]}    }    render(){        return(                        {this.state.arr.map((item,index)=>{                return(
)            })}            
        
)    }}export default Dot
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//css样式*{margin:0;padding:0;}.list{width:500px;     height:400px;     margin:30px auto;}ul{position: relative;   width:500px;   height:400px;   overflow: hidden;}li{    position: absolute;    list-style: none;}img{width:500px;    height:400px;    }.item-enter{    position: absolute;    opacity: 0;}.item-enter-active{opacity:1;    transition: 1.5s opacity ease-in-out;}.item-leave{ position: absolute;    opacity: 1;}.item-leave-active{    opacity: 0;    transition: 1.5s opacity ease-in-out;}.dot{    position: absolute;    top:380px;    left:250px;      width:150px;    height:50px;}.dot ul{width:100%;        height:100%;}.dot li{    position: static;    float:left;    margin-left:10px;    width:25px;    height:25px;    border-radius: 50%;    border:1px solid deeppink;    transition:3s;    list-style:none;}.current{background-color: gold;}
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