SOURCE

let fontData, textAnimationData;
let type = "flower";//transition 、effect 、text 、flower、animation
let canvas = document.getElementById('canvas');
let editor = new Editor(canvas);
let wordArt, wordArt1;
let fontNum = 0;
let animation1, animation2, animation3, textType, stickerNode, textNode, sticker_url, text_url;

let audioTrack = editor.track({ type: 'audio', zIndex: 0 });
let audioNode2;

const options = {
     attributes: {
      loop: true,
      volume: 1,
    },
    sourceOffset: 0,
    useEffect: true,
    type: 'fade',
    fade: {
      inTime: 0,
      outTime: 0,
    },
    playbackRate: 1,
    playbackRateType: 'native',
};

const src = "https://lf3-static.bytednsdoc.com/obj/eden-cn/4201eh7nuhpephbozupq/creative-video-editor/1234.m4a";
let audioNode1 = editor.audio(src, options);
audioNode1.timelineStart(0);
audioNode1.timelineStop(10);
audioTrack.addNode({ node: audioNode1 });

initEvent();
initEditor();
function initEvent() {
    let clipNodeDom = document.getElementById('clipNode');
    clipNodeDom.onclick = () => {
        audioNode2 = editor.audio(src, options);
        audioNode2.timelineStart(0);
        audioNode2.timelineStop(10);
        
        audioNode1.timelineStop(3);

        audioNode2.setSourceOffset(3);
        audioNode2.timelineStart(3);
    }

    let changeVolumeDom = document.getElementById('changeVolume1');
    changeVolumeDom.onclick = () => {
        audioNode1.volume = 0.1;
    }
}
function initEditor() {
    let graphCanvas = document.getElementById('graph');
    Editor.utils.visualiseVideoContextGraph(editor, graphCanvas, true);
    editor.on('timeupdate', () => {
        Editor.utils.visualiseVideoContextGraph(editor, graphCanvas);
    })
    InitVisualisations(editor, 'timeline-canvas', 'currentTime');
    playButton.onclick = () => {
        editor.play();
    }
    pauseButton.onclick = editor.pause.bind(editor);
    let interactiveBox = editor.initInteractiveBox(wrapper, {
        rotatable: true,
    });
}

 <div class="wrapper" id="wrapper">
    <canvas width="640" height="360" id="canvas"></canvas>
  </div>
  <button id="playButton">play</button>
  <button id="pauseButton">pause</button></br>
  <button id="clipNode">clip</button>
  <button id="changeVolume1"">changeVolume1</button>
  <p id="currentTime">
  </p>
  <p>
    <canvas id="timeline-canvas" width="640" height="20"></canvas>
  </p>
  <canvas width="640" height="360" id="graph"></canvas>

html {
    font-family: monospace;
    color: #333;
    /* background-color: black; */
  }
  #current {
    font-size: 12px;
  }
  #canvas {
    width: 640px;
    height: 360px;
  }
  #canvas2 {
    width: 640px;
    height: 360px;
    position: absolute;
    left: 0px;
    top: 0px;
    z-index: 10;
  }
  #container {
    position: relative;
  }

  button {
    line-height: 1.499;
      position: relative;
      display: inline-block;
      font-weight: 400;
      white-space: nowrap;
      text-align: center;
      background-image: none;
      border: 1px solid transparent;
      cursor: pointer;
      user-select: none;
      height: 32px;
      padding: 0 15px;
      font-size: 14px;
      border-radius: 4px;
      color: rgba(0,0,0,0.65);
      background-color: #fff;
      border-color: #d9d9d9;
      outline: 0;
      transition: all .3s cubic-bezier(.645, .045, .355, 1);
  }

  button:hover {
    color: #40a9ff;
    background-color: #fff;
    border-color: #40a9ff;
  }

  button:active {
    color: #096dd9;
    background-color: #fff;
    border-color: #096dd9;
  }

  input[type="text"] {
    -webkit-appearance: none;
    background-color: #fff;
    background-image: none;
    border-radius: 4px;
    border: 1px solid #dcdfe6;
    box-sizing: border-box;
    color: #606266;
    display: inline-block;
    font-size: inherit;
    height: 32px;
    line-height: 32px;
    outline: none;
    padding: 0 8px;
    transition: border-color 0.2s cubic-bezier(0.645, 0.045, 0.355, 1);
    width: 50px;
  }

  .wrapper {
    width: 640px;
    height: 360px;
    position: relative;
  }

@font-face {
  font-family: "hardFont";
  src: url('./../../assets/hardFont.ttf');
}
#bg-video{
    width:640px;
    height:400px;
}
#changeSrc{
    width:80%;
    height:40px;
    line-height: 40px;
}