import { Button, List, ListItem } from './weigets.js' export default class MusicList { constructor({ list = [], EventListeners = {} }) { this.ul = List({}) this.ul.classList.add('music-list') this.EventListeners = EventListeners this.list = [] list.forEach(item => this.add(item)) // 列表逐一添加 document.body.appendChild(this.ul) // 元素加入页面 // 添加音乐播放器 this.audio = new Audio() this.audio.addEventListener('ended', () => { this.next() }) //this.audio.addEventListener('timeupdate', () => { // console.log(this.audio.currentTime) //}) // 本地添加音乐按钮 const input = document.createElement('input') input.type = 'file' input.multiple = true input.accept = 'audio/*' input.onchange = event => { for (const file of event.target.files) { const id = 'music' + Date.now() const { name, size, type } = file const reader = new FileReader() reader.onload = async event => { const arrayBuffer = event.target.result this.add({ id, name, size, type, arrayBuffer }) } reader.readAsArrayBuffer(file) } } //// 写入 css 样式到 head const style = document.createElement('style') style.innerText = ` ul.music-list > li { cursor: pointer; } ul.music-list > li > button { margin-left: 10px; border: none; cursor: pointer; } ul.music-list > li > button:hover { background-color: #ccc; } ` document.head.appendChild(style) document.body.appendChild(input) } // 添加回调函数 on(name, callback) { this.EventListeners[name] = callback } add(item) { // 将字节转换为可读的单位 const bytesToSize = bytes => { if (bytes === 0) return '0 B' const k = 1024 const sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'] const i = Math.floor(Math.log(bytes) / Math.log(k)) return (bytes / Math.pow(k, i)).toFixed(2) + ' ' + sizes[i] } this.list.push(item) this.ul.appendChild(ListItem({ id: item.id, innerText: `${item.name} - ${bytesToSize(item.size)}`, children: [ Button({ innerText: '播放', onclick: event => { event.stopPropagation() if (event.target.dataset.play === 'play') { event.target.dataset.play = 'stop' event.target.innerText = '播放' this.stop() } else { event.target.dataset.play = 'play' event.target.innerText = '停止' this.play(item) } } }), Button({ innerText: '移除', onclick: event => { event.stopPropagation() this.remove(item) } }), Button({ innerText: '喜欢', onclick: event => { event.stopPropagation() this.like(item) } }), Button({ innerText: '禁止', onclick: event => { event.stopPropagation() if (event.target.dataset.ban === 'ban') { event.target.dataset.ban = 'unban' event.target.innerText = '禁止' } else { event.target.dataset.ban = 'ban' event.target.innerText = '解禁' this.stop() } } }) ] })) // 执行回调函数 if (this.EventListeners['add']) { this.EventListeners['add'](item) } } remove(item) { this.ul.querySelector(`#${item.id}`)?.remove() this.stop() // 停止播放 // 执行回调函数 if (this.EventListeners['remove']) { this.EventListeners['remove'](item) } } async load(item) { // 执行回调函数(应当异步) if (this.EventListeners['load']) { await this.EventListeners['load'](item) } } async play(item) { if (!item.arrayBuffer) { console.log('等待载入缓存:', item) await this.load(item) console.log('缓存载入完成:', item) } this.audio.src = URL.createObjectURL(new Blob([item.arrayBuffer], { type: item.type })) this.audio.play() // 执行回调函数 if (this.EventListeners['play']) { this.EventListeners['play'](item) } } stop() { this.audio.pause() this.audio.src = '' // 执行回调函数 if (this.EventListeners['stop']) { this.EventListeners['stop']() } } like(item) { if (!item.arrayBuffer) { console.log('载入缓存:', item) return } else { console.log('移除缓存:', item) return } } next() { } prev() { } }