VUE 元件的計算屬性詳解

 <div id='app'>
        <audio :src="currentSrc" controls autoplay @ended='handleEnded'></audio>
        <ul>
            <li :class='{active:index===currentIndex}' v-for='(item,index) in musicData' :key='item.id'
                @click='handleClick(item.songSrc,index)'>
                <h2>{{item.id}}-歌名：{{item.name}}</h2>
                <p>{{item.author}}</p>
            </li>
        </ul>
        <button @click='handleNext'>下一首</button>
    </div>

    <script src="./vue.js"></script>
    <script>
        const musicData = [{
                id: 1,
                name: '楊宗緯 - 空白格',
                author: '楊宗緯',
                songSrc: '楊宗緯 - 空白格 (Live).mp3'
            },
            {
                id: 2,
                name: '楊宗緯 - 其實都沒有',
                author: '楊宗緯',
                songSrc: '楊宗緯 - 其實都沒有.flac'
            },
            {
                id: 3,
                name: '楊宗緯 - 我想要',
                author: '楊宗緯',
                songSrc: '楊宗緯 - 我想要 (Live).flac'
            }
        ];

        new Vue({
            el: '#app',
            data: {
                musicData,
                currentSrc: '楊宗緯 - 空白格 (Live).mp3',
                currentIndex: 0
            },
            methods: {
                handleClick(src, index) {
                    this.currentSrc = src;
                    this.currentIndex = index;
                },
                handleEnded() {
                    // // 下一首的播放
                    // this.currentIndex++;
                    // this.currentSrc = this.musicData[this.currentIndex].songSrc;
                    this.handleNext();
                },
                handleNext() {
                    this.currentIndex++;
                    if (this.currentIndex === this.musicData.length) {
                        this.currentIndex = 0;
                    }
                    this.currentSrc = this.musicData[this.currentIndex].songSrc
                }
            }
        })
    </script>