08-Vue计算属性computed笔记

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title></title>

    <style type="text/css">

        *{

            padding: 0;

            margin: 0;

        }

        ul{

            list-style: none;

        }

        ul li{

            margin: 20px 20px;

            padding: 10px 5px;

            border-radius: 3px;

        }

        ul li.active{

            background-color: #66FFFF;

        }

 

    </style>

</head>

<body>

    <div id="app">

        <audio :src = 'getCurrentSongSrc' autoplay  controls></audio>

        <ul>

            <li v-for = '(item,index) in musicData' :class = '{active:currentIndex == index}' @click = 'clickHandler(index)'>

                <h2>{{item.id}}- 歌名:{{item.name}}</h2>

                <p>歌手:{{item.author}}</p>

            </li>

        </ul>

    </div>

    <script type="text/javascript" src="./vue.min.js"></script>

    <script type="text/javascript">

        

        var musicData = [

            {id:1,name:'于荣光 - 少林英雄',author:'于荣光',songSrc:'./static/于荣光 - 少林英雄.mp3'},

            {id:2,name:'Joel Adams - Please Dont Go',author:'Joel Adams',songSrc:'./static/Joel Adams - Please Dont Go.mp3'},

            {id:3,name:'MKJ - Time',author:'MKJ',songSrc:'./static/MKJ - Time.mp3'},

            {id:4,name:'Russ - Psycho (Pt. 2)',author:'Russ',songSrc:'./static/Russ - Psycho (Pt. 2).mp3'}

        ];

 

        new Vue({

            el:'#app',

            data(){

                return {

                    //key:value

                    musicData:musicData,

                    //声明索引

                    currentIndex: 0

                }

            },

            //监听多个属性

            computed:{

                //key:value

                getCurrentSongSrc:function() {

                    // 默认只有getter

                    return this.musicData[this.currentIndex].songSrc

                }

            },

            methods:{

                clickHandler(index){

                    //点哪个哪个变色

                    this.currentIndex = index;

                }

            }

        });


 

    </script>

    

</body>

</html>

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