{"id":3254,"date":"2021-09-01T17:30:57","date_gmt":"2021-09-01T09:30:57","guid":{"rendered":"https:\/\/feizhaojun.com\/?p=3254"},"modified":"2021-09-01T17:30:57","modified_gmt":"2021-09-01T09:30:57","slug":"%e4%bd%bf%e7%94%a8-react-hooks-%e6%9e%84%e5%bb%ba%e4%b8%80%e4%b8%aa%e9%9f%b3%e9%a2%91%e6%92%ad%e6%94%be%e5%99%a8","status":"publish","type":"post","link":"https:\/\/feizhaojun.com\/?p=3254","title":{"rendered":"\u4f7f\u7528 React Hooks \u6784\u5efa\u4e00\u4e2a\u97f3\u9891\u64ad\u653e\u5668"},"content":{"rendered":"

\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/letsbuildui.dev\/articles\/building-an-audio-player-with-react-hooks<\/em><\/p>\n

\u4eca\u5929\u6211\u4eec\u5c06\u4f7f\u7528 HTMLAudioElement<\/code> \u63a5\u53e3\u6784\u5efa\u4e00\u4e2a\u57fa\u4e8e React Hooks \u7684\u97f3\u9891\u64ad\u653e\u5668\u7ec4\u4ef6\u3002\u8fd9\u4e2a\u64ad\u653e\u5668\u53ef\u4ee5\u5b9e\u73b0\u97f3\u9891\u5217\u8868\u7684\u64ad\u653e\u3001\u6682\u505c\u3001\u8fdb\u5ea6\u6761\u62d6\u52a8\u4ee5\u53ca\u8df3\u8f6c\u5230\u4e0b\u4e00\u9996\u6216\u4e0a\u4e00\u9996\u66f2\u76ee\u3002\u53e6\u5916\uff0c\u6211\u4eec\u8fd8\u4f1a\u7ed9\u64ad\u653e\u5668\u52a0\u4e00\u4e2a\u53d8\u5e7b\u7684\u80cc\u666f\u8272\uff0c\u8ba9\u5b83\u770b\u8d77\u6765\u70ab\u9177\u4e00\u4e9b\u3002<\/p>\n

\"image\"<\/p>\n

\u67e5\u770b\u6f14\u793a<\/a><\/p>\n

\u8fd9\u4e2a\u97f3\u9891\u64ad\u653e\u5668\u7684\u8bbe\u8ba1\u7075\u611f\u6765\u81eaDribbble show<\/a>\uff0c\u793a\u4f8b\u97f3\u4e50\u6765\u81eaPixable<\/a>\u3002<\/p>\n

\u5f00\u59cb\u5427\uff01<\/p>\n

HTMLAudioElement \u6982\u89c8<\/h1>\n

\u6211\u4eec\u5904\u7406\u7f51\u9875\u4e0a\u7684\u97f3\u9891\u6709\u591a\u79cd\u4e0d\u540c\u7684\u65b9\u5f0f\u3002\u6700\u5e38\u89c1\u7684\u5c31\u662f\u4f7f\u7528 <audio><\/code> \u6807\u7b7e\uff0c\u6216\u8005\u7528 Web Audio API \u6765\u5b9e\u73b0\u66f4\u5e95\u5c42\u7684\u97f3\u9891\u63a7\u5236\u3002\u672c\u6559\u7a0b\u5c06\u91c7\u7528\u7684\u65b9\u6cd5\u662f HTMLAudioElement<\/code> \u63a5\u53e3\u3002<\/p>\n

\n HTMLAudioElement \u63a5\u53e3\u63d0\u4f9b <\/audio><audio><\/code> \u5143\u7d20\u7684\u5c5e\u6027\u8bbf\u95ee\u53ca\u4e00\u7cfb\u5217\u64cd\u63a7\u5b83\u7684\u65b9\u6cd5\u3002\u2014\u2014 MDN\u6587\u6863<\/a>\n<\/p><\/blockquote>\n

\u4f7f\u7528\u5b83\u975e\u5e38\u7b80\u5355\uff1a<\/p>\n

const audioElement = new Audio(audio source);\n<\/code><\/pre>\n
\u4e0a\u9762\u4ee3\u7801\u4e2d Audio()<\/code> \u6784\u9020\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a audio \u5143\u7d20\uff0c\u5305\u542b\u4e86\u9488\u5bf9\u8fd9\u4e2a\u97f3\u9891\u6e90\u7684\u65b9\u6cd5\u548c\u6570\u636e\u3002<\/p>\n
audioElement.play();\naudioElement.pause();\n\naudioElement.currentTime;\naudioElement.ended;\naudioElement.duration;\n<\/code><\/pre>\n
\u6211\u4eec\u5f88\u5feb\u5c31\u4f1a\u7528\u5230\u4e0a\u8ff0\u8fd9\u4e9b\u65b9\u6cd5\u3002\u4e0d\u8fc7\u9996\u5148\uff0c\u6211\u4eec\u8981\u5148\u5b9a\u4e49\u4e00\u4e0b\u6211\u4eec\u6240\u5f00\u53d1\u7684\u97f3\u9891\u64ad\u653e\u5668\u7ec4\u4ef6\u7684\u5c5e\u6027\u9009\u9879\u3002<\/p>\n
\u5b9a\u4e49\u7ec4\u4ef6\u7684\u5c5e\u6027<\/h1>\n
\u7ec4\u4ef6\u6240\u9700\u7684\u5c5e\u6027\u4ec5\u4ec5\u662f\u4e00\u4e2a\u97f3\u9891\u7684\u64ad\u653e\u5217\u8868\u5c31\u591f\u4e86\u3002\u6211\u4eec\u63d0\u4f9b\u4e00\u4e2a\u6570\u7ec4\uff0c\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u5143\u7d20\u5305\u542b\u4e86\u5355\u4e2a\u97f3\u9891\u7684\u6807\u9898\u3001\u6b4c\u624b\u3001\u97f3\u9891\u5730\u5740\u3001\u5c01\u9762\u548c\u989c\u8272\u3002<\/p>\n
const tracks = [\n    {\n        title: string,\n        artist: string,\n        audioSrc: string | import,\n        image: string,\n        color: string,\n    },\n    \/\/...\n    \/\/...\n];\n<\/code><\/pre>\n
\u97f3\u9891\u64ad\u653e\u5668\u7ec4\u4ef6<\/h1>\n
\u65b0\u5efa\u4e00\u4e2a\u6587\u4ef6 AudioPlayer.jsx<\/code>\uff0c\u5f15\u5165 useState<\/code>\u3001useEffect<\/code>\uff0cuseRef<\/code>\u3002<\/p>\n
\u6211\u4eec\u9700\u8981\u5b9a\u4e493\u4e2a state\uff0c\u5206\u522b\u662f\uff1a<\/p>\n
    \n
  1. trackIndex<\/code> \u5f53\u524d\u64ad\u653e\u66f2\u76ee\u7684\u7d22\u5f15\u3002<\/li>\n
  2. trackProgress<\/code> \u5f53\u524d\u97f3\u8f68\u7684\u64ad\u653e\u8fdb\u5ea6\u3002<\/li>\n
  3. isPlaying<\/code> \u662f\u5426\u6b63\u5728\u64ad\u653e\uff08\u6216\u6682\u505c\uff09\u3002<\/li>\n<\/ol>\n
    import React, { useState, useEffect, useRef } from 'react';\n\nconst AudioPlayer = ({ tracks }) => {\n    \/\/ State\n    const [trackIndex, setTrackIndex] = useState(0);\n    const [trackProgress, setTrackProgress] = useState(0);\n    const [isPlaying, setIsPlaying] = useState(false);\n\n    return <><\/>;\n}\n\nexport default AudioPlayer;\n<\/code><\/pre>\n
    \u9664\u4e86 state\uff0c\u6211\u4eec\u8fd8\u9700\u89813\u4e2a refs<\/code>\uff1a<\/p>\n
      \n
    1. audioRef<\/code> \u4f7f\u7528Audio<\/code>\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684audio\u5143\u7d20\u3002<\/li>\n
    2. intervalRef<\/code> \u4e00\u4e2a\u5bf9\u65f6\u95f4\u5b9a\u65f6\u5668setInterval<\/code>\u7684\u5f15\u7528\u3002<\/li>\n
    3. isReady<\/code> \u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u786e\u5b9a\u4e00\u4e9b\u64cd\u4f5c\u662f\u5426\u5728\u53ef\u8fd0\u884c\u72b6\u6001\u3002<\/li>\n<\/ol>\n
      const AudioPlayer = () => {\n    \/\/ State\n    \/\/...\n\n    \/\/ Destructure for conciseness\n    const { title, artist, color, image, audioSrc } = tracks[trackIndex];\n\n    \/\/ Refs\n    const audioRef = useRef(new Audio(audioSrc));\n    const intervalRef = useRef();\n    const isReady = useRef(false);\n\n    \/\/ Destructure for conciseness\n    const { duration } = audioRef.current;\n\n    return <><\/>;\n}\n<\/code><\/pre>\n
      \u4e0b\u4e00\u6b65\u6211\u4eec\u589e\u52a0\u4e24\u4e2afunction\uff1atoPrevTrack<\/code>\u7528\u6765\u5904\u7406\u201c\u4e0a\u4e00\u9996\u201d\u7684\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6\uff0ctoNextTrack<\/code>\u5904\u7406\u201c\u4e0b\u4e00\u9996\u201d\u3002\u968f\u540e\u6211\u4eec\u518d\u5b8c\u5584\u8fd9\u4e24\u4e2a\u51fd\u6570\u3002<\/p>\n
      const AudioPlayer = () => {\n    \/\/ State\n    \/\/...\n\n    \/\/ Refs\n    \/\/...\n\n    const toPrevTrack = () => {\n        console.log('TODO go to prev');\n    }\n\n    const toNextTrack = () => {\n        console.log('TODO go to next');\n    }\n\n    return <><\/>;\n}\n<\/code><\/pre>\n
      \u4e4b\u540e\uff0c\u6211\u4eec\u6765\u5199\u64ad\u653e\u5668\u7684HTML\uff0c\u9700\u8981\u5c55\u793a\u97f3\u9891\u7684\u5c01\u9762\u3001\u6807\u9898\u3001\u6b4c\u624b\uff0c\u9ed8\u8ba4\u64ad\u653e\u5217\u8868\u4e2d\u7684\u7b2c\u4e00\u9996\u66f2\u76ee\u3002<\/p>\n
      const AudioPlayer = () => {\n    \/\/ ...\n\n    return (\n        <div className=\"audio-player\">\n            <div className=\"track-info\">\n                <img className=\"artwork\"\n                    src={image}\n                    alt={`track artwork for ${title} by ${artist}`}\n                \/>\n                <h2 className=\"title\">{title}<\/h2>\n                <h3 className=\"artist\">{artist}<\/h3>\n            <\/div>\n        <\/div>\n    );\n}\n<\/code><\/pre>\n
      \"image\"<\/p>\n
      \u770b\u8d77\u6765\u4e0d\u9519\uff0c\u4f46\u662f\u8fd8\u4e0d\u591f\u7cbe\u81f4\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u6dfb\u52a0\u6837\u5f0f\u3002<\/p>\n
      \u64ad\u653e\u5668\u7684\u6837\u5f0f<\/h1>\n
      \u6211\u4eec\u4f1a\u4f7f\u7528\u4e00\u4e9b\u7b80\u5355\u7684CSS\u53d8\u91cf\u3002<\/p>\n
      \n  \u5176\u4e2d --active-color<\/code> \u53d8\u91cf\uff0c\u4f1a\u7528\u5728\u80cc\u666f\u8272\u53d8\u6362\u4e0a\u3002\n<\/p><\/blockquote>\n
      :root {\n    --white: #fff;\n    --active-color: #00aeb0;\n}\n\n* {\n    box-sizing: border-box;\n}\n\nhtml {\n    font-family: Arial, Helvetica, sans-serif;\n    height: 100%;\n    background: var(--active-color);\n    transition: background 0.4s ease;\n}\n\nbutton {\n    background: none;\n    border: none;\n    cursor: pointer;\n}\n<\/code><\/pre>\n
      \u9488\u5bf9\u64ad\u653e\u5668\u7684\u6837\u5f0f\uff1a<\/p>\n
      .audio-player {\n    max-width: 350px;\n    border-radius: 20px;\n    padding: 24px;\n    box-shadow: 0 28px 28px rgba(0, 0, 0, 0.2);\n    margin: auto;\n    color: var(--white);\n}\n\n.artwork {\n    border-radius: 120px;\n    display: block;\n    margin: auto;\n    height: 200px;\n    width: 200px;\n}\n\n.track-info {\n    text-align: center;\n    z-index: 1;\n    position: relative;\n}\n\n.title {\n    font-weight: 700;\n    margin-bottom: 4px;\n}\n\n.artist {\n    font-weight: 300;\n    margin-top: 0;\n}\n<\/code><\/pre>\n
      \"image\"<\/p>\n
      \u73b0\u5728\u6211\u4eec\u6765\u5199\u64ad\u653e\u5668\u7684\u63a7\u5236\u90e8\u5206\u3002<\/p>\n
      \u63a7\u5236\u7ec4\u4ef6<\/h1>\n
      \u97f3\u9891\u63a7\u5236\u7ec4\u4ef6\u63d0\u4f9b\u64ad\u653e\u3001\u6682\u505c\u3001\u4e0a\u4e00\u9996\u3001\u4e0b\u4e00\u9996\u6309\u94ae\u3002\u6211\u4eec\u5c06\u8fd9\u4e9b\u63a7\u5236\u5143\u7d20\u63d0\u53d6\u51fa\u6765\u7ec4\u6210\u5355\u72ec\u7ec4\u4ef6\uff0c\u4e0e\u64ad\u653e\u5668\u4e3b\u4f53 AudioPlayer<\/code> \u7ec4\u4ef6\u5206\u79bb\u3002<\/p>\n
      \u9996\u5148\u65b0\u5efa\u6587\u4ef6 AudioControls.jsx<\/code>\u3002\u7ec4\u4ef6\u9700\u8981\u4e00\u4e9b\u5c5e\u6027\uff0c\u6211\u4eec\u9700\u8981\u77e5\u9053\u97f3\u9891\u662f\u5426\u6b63\u5728\u64ad\u653e\uff0c\u8fd9\u6837\u6211\u4eec\u624d\u80fd\u51b3\u5b9a\u5e94\u8be5\u663e\u793a\u64ad\u653e\u6309\u94ae\u8fd8\u662f\u6682\u505c\u6309\u94ae\u3002\u6211\u4eec\u4f20\u5165 state \u503c isPlaying<\/code> \u4f5c\u4e3a\u5c5e\u6027\u3002\u6211\u4eec\u8fd8\u9700\u8981\u4f20\u5165\u4e00\u4e9bhandle\u51fd\u6570\u6765\u5904\u7406\u64ad\u653e\u6216\u6682\u505c\u3001\u4e0a\u4e00\u9996\u3001\u4e0b\u4e00\u9996\u8fd9\u4e9b\u52a8\u4f5c\uff0c\u5206\u522b\u662f onPlayPauseClick<\/code>\u3001onPrevClick<\/code>\u3001onNextClick<\/code>\u3002<\/p>\n
      const AudioControls = ({\n    isPlaying,\n    onPlayPauseClick,\n    onPrevClick,\n    onNextClick,\n}) => {\n    \/\/ ...\n}\n\nexport default AudioControls;\n<\/code><\/pre>\n
      \u7136\u540e\u662f\u63a7\u5236\u7ec4\u4ef6\u7684HTML\uff1a<\/p>\n
      \n  svg \u7684\u4f7f\u7528\u53d6\u51b3\u4e8e\u4f60\u7684\u73af\u5883\u914d\u7f6e\u3002Create React App \u9ed8\u8ba4\u53ef\u4ee5\u4f7f\u7528svg\uff0c\u5982\u679c\u4f60\u7528\u4e86\u5176\u4ed6\u6784\u5efa\u5de5\u5177\u53ef\u80fd\u9700\u8981\u914d\u7f6ewbpack\u4ee5\u8ba9\u5b83\u53ef\u7528\u3002\n<\/p><\/blockquote>\n
      import React from 'react';\nimport { ReactComponent as Play } from '.\/assets\/play.svg';\nimport { ReactComponent as Pause } from '.\/assets\/pause.svg';\nimport { ReactComponent as Next } from '.\/assets\/next.svg';\nimport { ReactComponent as Prev } from '.\/assets\/prev.svg';\n\nconst AudioControls = ({\n    \/\/ ...\n}) => (\n    <div className=\"audio-controls\">\n        <button\n            type=\"button\"\n            className=\"prev\"\n            aria-label=\"Previous\"\n            onClick={onPrevClick}\n        >\n            <Prev \/>\n        <\/button>\n        {\n            isPlaying ? (\n                <button\n                    type=\"button\"\n                    className=\"pause\"\n                    onClick={() => onPlayPauseClick(false)}\n                    aria-label=\"Pause\"\n                >\n                    <Pause \/>\n                <\/button>\n            ) : (\n                <button\n                    type=\"button\"\n                    className=\"play\"\n                    onClick={() => onPlayPauseClick(true)}\n                    aria-label=\"Play\"\n                >\n                    <Play \/>\n                <\/button>\n            )\n        }\n        <button\n            type=\"button\"\n            className=\"next\"\n            aria-label=\"Next\"\n            onClick={onNextClick}\n        >\n            <Next \/>\n        <\/button>\n    <\/div>\n);\n<\/code><\/pre>\n
      \u6700\u540e\uff0c\u4e3a\u63a7\u5236\u5668\u5b9a\u4e49\u6837\u5f0f\u3002<\/p>\n
      .audio-controls {\n    display: flex;\n    justify-content: space-between;\n    width:  75%;\n    margin: 0 auto 15px;\n}\n\n.audio-controls .prev svg,\n.audio-controls .next svg {\n    width: 35px;\n    height: 35px;\n}\n\n.audio-controls .play svg,\n.audio-controls .pause svg {\n    height: 40px;\n    width: 40px;\n}\n\n.audio-controls path {\n    fill: var(--white);\n}\n<\/code><\/pre>\n
      \u628a\u63a7\u5236\u7ec4\u4ef6 AudioControls<\/code> \u6dfb\u52a0\u5230\u64ad\u653e\u5668\u4e3b\u4f53 AudioPlayer<\/code> \u7ec4\u4ef6\u4e2d\uff0c\u5e76\u4e3a\u5176\u6dfb\u52a0\u76f8\u5173\u5c5e\u6027\uff08 isPlaying \u4ee5\u53ca handlers\uff09\u3002<\/p>\n
      import AudioControls from '.\/AudioControls';\n\nconst AudioPlayer = () => {\n    \/\/ ...\n    \/\/ ...\n    return (\n        <div className=\"audio-player\">\n            <div className=\"track-info\">\n                <img className=\"artwork\"\n                    src={image}\n                    alt={`track artwork for ${title} by ${artist}`}\n                \/>\n                <h2>{title}<\/h2>\n                <h3>{artist}<\/h3>\n                <audiocontrols\n                    isPlaying={isPlaying}\n                    onPrevClick={toPrevTrack}\n                    onNextClick={toNextTrack}\n                    onPlayPauseClick={setIsPlaying}><\/audiocontrols>\n            <\/div>\n        <\/div>\n    );\n}\n<\/code><\/pre>\n
      \"image\"<\/p>\n
      \u8fd9\u4e9b\u64ad\u653e\u63a7\u5236\u6309\u94ae\u5c31\u4f4d\u4e86\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u8ba9\u64ad\u653e\u5668\u8fd0\u884c\u8d77\u6765\u3002<\/p>\n
      \u97f3\u9891\u64ad\u653e\u5668\u7684\u64cd\u4f5c<\/h1>\n
      \u56de\u5230 AudioPlayer<\/code> \u7ec4\u4ef6\uff0c\u6211\u4eec\u5b8c\u6210\u4e4b\u524d\u5b9a\u4e49\u7684 toPrevTrack<\/code> \u548c toNextTrack<\/code> \u51fd\u6570\u3002<\/p>\n
      \u70b9\u51fb\u201c\u4e0b\u4e00\u9996\u201d\u9700\u8981\u64ad\u653e\u5217\u8868\u4e2d\u7684\u4e0b\u4e00\u66f2\u76ee\uff0c\u6216\u8005\u56de\u5230\u5f00\u59cb\u3002\u70b9\u51fb\u201c\u4e0a\u4e00\u9996\u201d\u5219\u76f8\u53cd\u3002<\/p>\n
      \u6211\u4eec\u8fd9\u91cc\u4f7f\u7528\u5230state\u503c trackIndex<\/code> \u548c tracks<\/code> \u7684\u957f\u5ea6\u3002<\/p>\n
      const toPrevTrack = () => {\n    if (trackIndex - 1 < 0) {\n        setTrackIndex(tracks.length - 1);\n    } else {\n        setTrackIndex(trackIndex - 1);\n    }\n}\n\nconst toNextTrack = () => {\n    if (trackIndex < tracks.length - 1) {\n        setTrackIndex(trackIndex + 1);\n    } else {\n        setTrackIndex(0);\n    }\n}\n<\/code><\/pre>\n
      \u73b0\u5728\u5c31\u53ef\u4ee5\u5728\u5217\u8868\u4e2d\u5207\u6362\u66f2\u76ee\u4e86\u3002<\/p>\n
      \u6211\u4eec\u6dfb\u52a0\u4e00\u4e9b useEffect<\/code> \u94a9\u5b50\u3002<\/p>\n
      \u7b2c\u4e00\u4e2a\u662f\u70b9\u51fb\u201c\u64ad\u653e\u6216\u6682\u505c\u201d\u6309\u94ae\u7684\u65f6\u5019\uff0c\u6765\u5f00\u59cb\u6216\u505c\u6b62\u64ad\u653e\u3002<\/p>\n
      useEffect(() => {\n    if (isPlaying) {\n        audioRef.current.play();\n    } else {\n        audioRef.current.pause();\n    }\n}, [isPlaying]);\n<\/code><\/pre>\n
      \u5f53 isPlaying<\/code> \u503c\u6539\u53d8\uff0c\u6211\u4eec\u6839\u636e\u5b83\u7684\u503c\u6765\u8c03\u7528 audioRef<\/code> \u7684 play()<\/code> \u6216 pause()<\/code> \u65b9\u6cd5\u3002<\/p>\n
      \u73b0\u5728\u4f60\u70b9\u64ad\u653e\u6309\u94ae\u5c31\u53ef\u4ee5\u542c\u5230\u58f0\u97f3\u4e86\uff0c\u5e76\u4e14\u70b9\u51fb\u6682\u505c\u53ef\u4ee5\u505c\u6b62\u3002<\/p>\n
      \u63a5\u4e0b\u6765\u8fd9\u4e2a useEffect<\/code> \u94a9\u5b50\u5c06\u5728\u7ec4\u4ef6\u5378\u8f7d\u65f6\u505a\u4e9b\u6e05\u7406\u5de5\u4f5c\u3002\u5f53\u7ec4\u4ef6\u5378\u8f7d\uff0c\u6211\u4eec\u60f3\u8981\u786e\u5b9a\u97f3\u9891\u505c\u6b62\uff0c\u5e76\u4e14\u628a\u53ef\u80fd\u5728\u8fd0\u884c\u7684\u5b9a\u65f6\u5668\u6e05\u7a7a\u3002\u968f\u540e\u6211\u4eec\u4f1a\u4ecb\u7ecd\u66f4\u591a\u6709\u5173\u5b9a\u65f6\u5668\u7684\u5185\u5bb9\uff01<\/p>\n
      useEffect(() => {\n    \/\/ Pause and clean up on unmount\n    return () => {\n        audioRef.current.pause();\n        clearInterval(intervalRef.current);\n    }\n}, []);\n<\/code><\/pre>\n
      \u6700\u540e\u4e00\u4e2a useEffect<\/code> \u94a9\u5b50\u4f1a\u5728 state trackIndex<\/code> \u6539\u53d8\u65f6\u8fd0\u884c\u3002\u5b83\u5141\u8bb8\u6211\u4eec\u6682\u505c\u5f53\u524d\u66f2\u76ee\uff0c\u66f4\u65b0 audioRef<\/code> \u7684\u503c\u4e3a\u4e00\u4e2a\u65b0\u7684\u97f3\u9891\u6e90\uff0c\u91cd\u7f6e\u64ad\u653e\u8fdb\u5ea6\u6761\uff0c\u5e76\u5f00\u59cb\u65b0\u66f2\u76ee\u7684\u64ad\u653e\u3002<\/p>\n
      \/\/ Handle setup when changing tracks\nuseEffect(() => {\n    audioRef.current.pause();\n\n    audioRef.current = new Audio(audioSrc);\n    setTrackProgress(audioRef.current.currentTime);\n\n    if (isReady.current) {\n        audioRef.current.play();\n        setIsPlaying(true);\n        startTimer();\n    } else {\n        \/\/ Set the isReady ref as true for the next pass\n        isReady.current = true;\n    }\n}, [trackIndex]);\n<\/code><\/pre>\n
      \u8fd9\u91cc\u6211\u4eec\u8bbe\u7f6e\u9996\u6b21\u8fd0\u884c\uff08\u7ec4\u4ef6\u521d\u59cb\u5316\uff09\u65f6 isReady<\/code> \u7684\u503c\u3002\u8fd9\u6837\u53ef\u4ee5\u9632\u6b62\u8fd9\u4e2a useEffect<\/code> \u5728\u9996\u6b21\u8fd0\u884c\u65f6\u97f3\u9891\u5f00\u59cb\u81ea\u52a8\u64ad\u653e\uff0c\u8fd9\u4e0d\u662f\u6211\u4eec\u5e0c\u671b\u7684\u3002\u7b2c\u4e8c\u6b21\u4ee5\u53ca\u968f\u540e\u8fd0\u884c\uff08\u5f53 trackIndex<\/code> \u6539\u53d8\uff09\u65f6\uff0c\u624d\u662f\u6211\u4eec\u671f\u671b\u5f00\u59cb\u64ad\u653e\u7684\u903b\u8f91\u3002<\/p>\n
      \u5982\u679c\u4f60\u6d4b\u8bd5\u64ad\u653e\u5668\u7684\u63a7\u4ef6\uff0c\u4f1a\u53d1\u73b0\u5b83\u4eec\u5df2\u7ecf\u6b63\u5e38\u5de5\u4f5c\u4e86\u3002<\/p>\n
      \u64ad\u653e\u8fdb\u5ea6\u548c\u6ed1\u5757<\/h1>\n
      \u63a5\u4e0b\u6765\u6211\u4eec\u8981\u663e\u793a\u97f3\u8f68\u7684\u64ad\u653e\u8fdb\u5ea6\uff0c\u6dfb\u52a0\u6ed1\u5757\u529f\u80fd\uff0c\u53ef\u4ee5\u6ed1\u5230\u66f2\u76ee\u67d0\u4e2a\u65f6\u95f4\u4f4d\u7f6e\u3002<\/p>\n
      \u5728 AudioPlayer<\/code> \u7ec4\u4ef6\u4e2d\uff0c\u5b9a\u4e49\u4e00\u4e2a\u65b0\u7684\u51fd\u6570 startTimer<\/code>\u3002\u5f53\u4e00\u4e2a\u97f3\u9891\u5f00\u59cb\u64ad\u653e\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u51fd\u6570\u5c31\u4f1a\u542f\u52a8\u4e00\u4e2a\u65b0\u7684 setInterval<\/code> \u8ba1\u65f6\u5668\u3002<\/p>\n
      const AudioPlayer = () => {\n    \/\/ ...\n    \/\/ ...\n\n    const startTimer = () => {\n        \/\/ Clear any timers already running\n        clearInterval(intervalRef.current);\n\n        intervalRef.current = setInterval(() => {\n            if (audioRef.current.ended) {\n                toNextTrack();\n            } else {\n                setTrackProgress(audioRef.current.currentTime);\n            }\n        }, [1000]);\n    }\n}\n<\/code><\/pre>\n
      \u6bcf\u9694\u4e00\u79d2\uff0c\u6211\u4eec\u68c0\u67e5\u97f3\u9891\u662f\u5426\u5df2\u7ecf\u64ad\u653e\u5b8c\u3002\u5982\u679c\u64ad\u653e\u5b8c\uff0c\u8df3\u5230\u4e0b\u4e00\u4e2a\u97f3\u9891\uff0c\u7136\u540e\u66f4\u65b0 trackProgress<\/code> state\u3002\u8ba1\u65f6\u5668\u7684 ID \u5b58\u50a8\u5728 intervalRef<\/code>\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5728\u7ec4\u4ef6\u7684\u5176\u4ed6\u5730\u65b9\u6e05\u9664\u8ba1\u65f6\u5668\u3002<\/p>\n
      The function is called as part of thehooks we added in the previous section. First, add it when thestate changes and is true.<\/p>\n
      \u51fd\u6570 startTimer<\/code> \u4f1a\u4f5c\u4e3a\u6211\u4eec\u524d\u9762\u6dfb\u52a0\u7684 useEffect<\/code> hooks \u7684\u4e00\u90e8\u5206\u88ab\u8c03\u7528\u3002\u9996\u5148\uff0c\u5f53 isPlaying<\/code> state \u53d8\u5316\u5e76\u4e14\u503c\u4e3a true \u65f6\u6267\u884c\u3002<\/p>\n
      useEffect(() => {\n    if (isPlaying) {\n        audioRef.current.play();\n        startTimer();\n    } else {\n        clearInterval(intervalRef.current);\n        audioRef.current.pause();\n    }\n}, [isPlaying]);\n<\/code><\/pre>\n
      trackIndex<\/code> \u7684\u503c\u6539\u53d8\u65f6\uff0c\u4e5f\u9700\u8981\u6267\u884c startTimer<\/code> \u51fd\u6570\u3002<\/p>\n
      useEffect(() => {\n    audioRef.current.pause();\n\n    audioRef.current = new Audio(audioSrc);\n    setTrackProgress(audioRef.current.currentTime);\n\n    if (isReady.current) {\n        audioRef.current.play();\n        setIsPlaying(true);\n        startTimer();\n    }\n}, [trackIndex]);\n<\/code><\/pre>\n
      \u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u7740\u624b\u8fdb\u5ea6\u6761\u4e86\u3002<\/p>\n
      \u4e3a\u4e86\u8ba9\u754c\u9762\u65b9\u4fbf\u53ef\u63a7\uff0c\u6211\u4eec\u4f7f\u7528\u539f\u751fHTML\u7684 range input \u6765\u5b9e\u73b0\u8fdb\u5ea6\u6761\u3002\u8fd9\u6837\u53ef\u4ee5\u8ba9\u6211\u4eec\u4f7f\u7528\u9f20\u6807\u6216\u952e\u76d8\u81ea\u7531\u5730\u62d6\u52a8\u8fdb\u5ea6\uff0c\u5e76\u4e14\u6709\u5927\u91cf\u7684\u4e8b\u4ef6\u4fbf\u4e8e\u5904\u7406\u3002<\/p>\n
      return (\n    <div className=\"audio-player\">\n        <div className=\"track-info\">\n            \/\/ ...\n            <audiocontrols ...><\/audiocontrols>\n            <input type=\"range\"\n                value={trackProgress}\n                step=\"1\"\n                min=\"0\"\n                max={duration ? duration : `${duration}`}\n                className=\"progress\"\n                onChange={(e) =\/> onScrub(e.target.value)}\n                onMouseUp={onScrubEnd}\n                onKeyUp={onScrubEnd}\n            \/>\n        <\/div>\n    <\/div>\n);\n<\/code><\/pre>\n
      \n  duration<\/code>\u7684\u503c\u4f1a\u88ab\u521d\u59cb\u5316\u4e3a NaN<\/code>\u3002React \u629b\u51fa\u8b66\u544a\uff1a\u201cReceived NaN for the max<\/code> attribute. If this is expected, cast the value to a string\u201d\u3002\u6309\u7167\u8b66\u544a\u7684\u5efa\u8bae\uff0c\u5728\u97f3\u9891\u5f00\u59cb\u64ad\u653e\uff0c\u6709\u771f\u6b63\u7684 duration \u503c\u66ff\u6362\u4e4b\u524d\uff0c\u6211\u4eec\u4e3a\u5176\u8d4b\u503c\u4e3a\u4e00\u4e2a string\u3002\n<\/p><\/blockquote>\n
      \u6211\u4eec\u518d\u6dfb\u52a02\u4e2a\u51fd\u6570\uff1aonScrubEnd<\/code> \u548c onScrub<\/code>\u3002\u5728\u4ee5\u4e0b\u4ea4\u4e92\u4e8b\u4ef6\u6267\u884c\u8fd92\u4e2a\u51fd\u6570\uff1aonkeyup<\/code>\u3001onChange<\/code> \u548c onMouseUp<\/code>\u3002<\/p>\n
      const onScrub = (value) => {\n    \/\/ Clear any timers already running\n    clearInterval(intervalRef.current);\n    audioRef.current.currentTime = value;\n    setTrackProgress(audioRef.current.currentTime);\n}\n\nconst onScrubEnd = () => {\n    \/\/ If not already playing, start\n    if (!isPlaying) {\n        setIsPlaying(true);\n    }\n    startTimer();\n}\n<\/code><\/pre>\n
      \u73b0\u5728\u4e3a\u8fdb\u5ea6\u6761\u6dfb\u52a0\u4e00\u4e9b\u6837\u5f0f\u3002<\/p>\n
      \n  \u6216\u8bb8\u8fd8\u6709\u5176\u5b83\u65b9\u6cd5\uff0c\u4f46\u662f range input \u5de6\u4fa7\u9009\u8fc7\u90e8\u5206\u7684\u6837\u5f0f\u4f3c\u4e4e\u8fd8\u6ca1\u6709\u4e00\u4e2a\u8de8\u6d4f\u89c8\u5668\u7684\u6807\u51c6\u3002\u4e0b\u9762\u91c7\u53d6\u7684\u65b9\u6848\u662f\u4f7f\u7528 webkit-gradient<\/code>\uff0c\u517c\u5bb9 Chrome\u3001Firefox \u548c Sarari\uff0c\u4f46\u5176\u5b83\u6d4f\u89c8\u5668\u8fd8\u6ca1\u6709\u6d4b\u8bd5\u3002\n<\/p><\/blockquote>\n
      \u4f7f\u7528\u4e00\u4e2a\u5e38\u91cf\u4fdd\u5b58\u5f53\u524d\u64ad\u653e\u8fdb\u5ea6\u7684\u767e\u5206\u6bd4\u3002\u6211\u4eec\u4e0b\u9762\u5728 webkit-gradient<\/code> \u4e2d\u76f4\u63a5\u4f7f\u7528\u8fd9\u4e2a\u767e\u5206\u6bd4\u503c\uff0c\u6765\u663e\u793a range input \u7684\u80cc\u666f\u6837\u5f0f\u3002<\/p>\n
      const currentPercentage = duration ? `${(trackProgress \/ duration) * 100}%` : '0%';\nconst trackStyling = `\n    -webkit-gradient(linear, 0% 0%, 100% 0%, color-stop(${currentPercentage}, #fff), color-stop(${currentPercentage}, #777))\n`;\n\nreturn ( ... );\n<\/code><\/pre>\n
      \u8fd9\u6837\u5c31\u521b\u5efa\u4e86\u4e00\u4e2a\u767d\u8272\u80cc\u666f\u8986\u76d6\u5728 range input \u4e0a\uff0c\u6765\u5448\u73b0\u97f3\u9891\u64ad\u653e\u7684\u8fdb\u5ea6\u3002<\/p>\n
      \"player<\/p>\n
      \u7136\u540e\uff0c\u5c06\u5e38\u91cf trackStyling<\/code> \u4f5c\u4e3a style \u5c5e\u6027\u5e94\u7528\u7684 input \u4e0a\u3002<\/p>\n
      return (\n  ...\n  ...\n    <input type=\"range\"\n        value={trackProgress}\n        step=\"1\"\n        min=\"0\"\n        max={duration ? duration : `${duration}`}\n        className=\"progress\"\n        onChange={(e) =\/> onScrub(e.target.value)}\n        onMouseUp={onScrubEnd}\n        onKeyUp={onScrubEnd}\n        style={{ background: trackStyling }}\n    \/>\n);\n<\/code><\/pre>\n
      \u6700\u540e\u4e3a\u8fdb\u5ea6\u6761\u6dfb\u52a0 CSS \u6837\u5f0f\u3002<\/p>\n
      input[type=range] {\n    height: 5px;\n    -webkit-appearance: none;\n    width: 100%;\n    margin-bottom: 10px;\n    border-radius: 8px;\n    background: #3b7677;\n    transition: background 0.2s ease;\n    cursor: pointer;\n}\n<\/code><\/pre>\n
      \u53cb\u60c5\u63d0\u793a\uff0c\u6211\u53d1\u73b0\u5982\u679c\u4f60\u5728 CSS \u4e2d\u5c1d\u8bd5\u9690\u85cf\u62d6\u52a8\u5757\uff0c\u7136\u540e\u7528\u5de6\u53f3\u952e\u5934\u63a7\u5236\u8fdb\u5ea6\u540e\u9000\u6216\u524d\u8fdb\uff0c\u5728 Safari \u4e2d\u4f1a\u4e0d\u6d41\u7545\u3002\u56e0\u6b64\uff0c\u6211\u7d22\u6027\u5c06 range input \u4fdd\u7559\u4e3a\u6d4f\u89c8\u5668\u9ed8\u8ba4\u6837\u5f0f\u3002<\/p>\n
      \"playback<\/p>\n
      \u6539\u53d8\u80cc\u666f\u8272<\/h1>\n
      \u6211\u4eec\u8981\u505a\u7684\u6700\u540e\u4e00\u4ef6\u4e8b\u662f\u6539\u53d8\u9875\u9762\u7684\u80cc\u666f\u8272\u3002\u56e0\u4e3a\u6bcf\u4e00\u4e2a\u97f3\u9891\u90fd\u4f1a\u6709\u4e00\u4e2a\u76f8\u5e94\u7684 color<\/code> \u503c\uff0c\u6211\u4eec\u8981\u505a\u7684\u53ea\u662f\u66f4\u65b0 CSS \u4e2d\u7684\u53d8\u91cf --active-color<\/code>\u3002\u4e4b\u524d\u6211\u4eec\u8bbe\u7f6e\u4e86 HTML \u4f7f\u7528\u8fd9\u4e2a\u53d8\u91cf\u4f5c\u4e3a\u80cc\u666f\uff0c\u968f\u7740\u66f4\u65b0\uff0c\u6211\u4eec\u4f1a\u5728\u66f2\u76ee\u5faa\u73af\u64ad\u653e\u65f6\u770b\u5230\u989c\u8272\u7684\u53d8\u5316\u3002<\/p>\n
      \u6211\u4eec\u4ece\u4e00\u4e2a\u65b0\u7684\u7ec4\u4ef6 Backdrop.jsx<\/code> \u5f00\u59cb\u3002\u901a\u8fc7\u4e00\u4e2a useEffect<\/code> hook\uff0c\u5f53 trackIndex<\/code> \u6539\u53d8\u65f6\uff0csetProperty<\/code> \u65b9\u6cd5\u4f1a\u66f4\u65b0 CSS \u53d8\u91cf\u503c\u3002<\/p>\n
      import React, { useEffect } from 'react';\n\nconst Backdrop = ({\n    activeColor,\n    trackIndex,\n    isPlaying,\n}) => {\n    useEffect(() => {\n        document.documentElement.style.setProperty('--active-color', activeColor);\n    }, [trackIndex]);\n\n    return (\n        <div className={`color-backdrop ${isPlaying ? 'playing' : 'idle'}`}><\/div>\n    );\n};\n\nexport default Backdrop;\n<\/code><\/pre>\n
      \u56de\u5230 AudioPlayer<\/code> \u7ec4\u4ef6, \u5728 track-info<\/code> \u4e4b\u540e\u5f15\u5165 Backdrop<\/code> \u7ec4\u4ef6\u3002<\/p>\n
      const AudioPlayer = () => {\n    \/\/ ...\n    \/\/ ...\n    return (\n        <div className=\"audio-player\">\n            <div className=\"track-info\">\n            \/\/ ...\n            <\/div>\n            <Backdrop\n                trackIndex={trackIndex}\n                activeColor={color}\n                isPlaying={isPlaying}\n            \/>\n        <\/div>\n    );\n}\n<\/code><\/pre>\n
      \"background<\/p>\n
      \u73b0\u5728\u52a0\u70b9\u52a8\u753b\u3002\u540c\u6837\u4e5f\u662f\u4f7f\u7528 --active-color<\/code> \u53d8\u91cf\u8bbe\u7f6e\u4e00\u4e2a\u6e10\u53d8\u80cc\u666f\uff08linear-gradient\uff09\uff0c\u5c06\u5176\u8bbe\u7f6e\u4e3a\u6574\u4e2a\u5c4f\u5e55\u7684\u5bbd\u9ad8\u3002<\/p>\n
      .color-backdrop {\n    background: linear-gradient(45deg, var(--active-color) 20%, transparent 100%) no-repeat;\n    position: absolute;\n    top: 0;\n    left: 0;\n    right: 0;\n    bottom: 0;\n    z-index: -1;\n}\n\n.color-backdrop.playing {\n    animation: colorChange 20s alternate infinite;\n}\n<\/code><\/pre>\n
      The animation is applied when the audio is playing<\/code> and the backdrop has the playing class. It's done using the hue-rotate<\/code> filter function.<\/p>\n
      \u5f53\u97f3\u9891\u64ad\u653e\u72b6\u6001\u4e3a playing<\/code> \u65f6\uff0cbackdrop \u7ec4\u4ef6\u4f1a\u5305\u542bclass playing<\/code>\u3002\u7136\u540e\u901a\u8fc7 hue-rotate<\/code> \u8fd9\u4e2a filter \u51fd\u6570\u6765\u5b9e\u73b0\u3002<\/p>\n
      \n  CSS \u51fd\u6570 hue-rotate()<\/code> \u53ef\u4ee5\u53d8\u6362\u5143\u7d20\u53ca\u5185\u5bb9\u7684\u8272\u8c03\u3002\u2014\u2014 MDN \u6587\u6863<\/a>\n<\/p><\/blockquote>\n
      Hue-rotate<\/code> \u63a5\u53d7\u4e00\u4e2a\u89d2\u5ea6\u4f5c\u4e3a\u53c2\u6570\u3002\u6211\u4eec\u5728\u52a8\u753b\u8bbe\u7f6e\u7684 keyframe \u5f53\u4e2d\u628a\u65cb\u8f6c\u89d2\u5ea6\u8bbe\u4e3a360\u3002<\/p>\n
      @keyframes colorChange {\n  from {\n    filter: hue-rotate(0deg);\n  }\n    to {\n    filter: hue-rotate(360deg);\n  }\n}\n<\/code><\/pre>\n
      \n  \u53cb\u60c5\u63d0\u793a\uff0chue-rotate<\/code> \u4e0d\u652f\u6301 IE \u6d4f\u89c8\u5668\u3002<\/p>\n
        \u5982\u679c\u4f60\u60f3\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528\u8fd9\u7c7b\u52a8\u753b\uff0c\u4f60\u9700\u8981\u628aanimation\u7684\u76f8\u5173\u6837\u5f0f\u5199\u5728 prefers-reduced-motion<\/code> \u7684\u5a92\u4f53\u67e5\u8be2\u5f53\u4e2d\u3002\u8bf7\u53c2\u89c1\u6211\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\u5199\u7684 \u8fd9\u7bc7\u6587\u7ae0<\/a>\u3002\n<\/p><\/blockquote>\n
      \u603b\u7ed3<\/h1>\n
      \u6211\u4eec\u8bb2\u4e86\u8fd9\u4e48\u591a\uff0c\u611f\u8c22\u4f60\u770b\u5230\u4e86\u6700\u540e\u3002\u73b0\u5728\u4f60\u5e94\u8be5\u5bf9\u97f3\u9891\u76f8\u5173\u5904\u7406\u6709\u4e86\u5f88\u5927\u628a\u63e1\uff0c\u6211\u5e0c\u671b\u80fd\u6709\u52a9\u4e8e\u4f60\u5f00\u53d1\u5c5e\u4e8e\u81ea\u5df1\u7684\u66f4\u9177\u7684\u97f3\u9891\u9879\u76ee\u3002<\/p>\n
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