SOURCE

canvas = document.getElementById('canvas');
editor = new Editor(canvas);
hasEffect = false;

imageNode1 = editor.image("http://sf3-ttcdn-tos.pstatp.com/obj/ttfe/video_editor/16v9.jpg", {
    width: 160,
    height: 90,
    top: 0, 
    left: 480
});
imageNode2 = editor.image("http://sf3-ttcdn-tos.pstatp.com/obj/ttfe/video_editor/example.png", {
    width: 50,
    height: 50,
    top: 0, 
    left: 590
});
videoNode = editor.video("http://sf3-ttcdn-tos.pstatp.com/obj/ttfe/video_editor/example1.mp4", {
    sourceOffset: 5
});

imageNode1.timelineStart(0);
imageNode1.timelineStop(10);

imageNode2.timelineStart(0);
imageNode2.timelineStop(10);

videoNode.timelineStart(0);
videoNode.timelineStop(10);

videoNode.connect(editor.output);
imageNode1.connect(editor.output);
imageNode2.connect(editor.output);

playButton.onclick = editor.play.bind(editor);
pauseButton.onclick = editor.pause.bind(editor);

changeButton.onclick = function(){
    videoNode.zIndex = vIndexEl.value;
    imageNode1.zIndex = imgIndexEl1.value;
    imageNode2.zIndex = imgIndexEl2.value;
};

let wrapper = document.getElementById('wrapper');
let interactiveBox = editor.initInteractiveBox(wrapper);
InitVisualisations(editor, 'timeline-canvas', 'current')

<style>
    .wrapper {
        position: relative;
        width: 640px;
        height: 360px;
        overflow: hidden;
    }
</style>   

<div class="wrapper" id="wrapper">
        <canvas width="640" height="360" id="canvas"></canvas>
    </div>
    <p>
      <button id="playButton">play</button>
      <button id="pauseButton">pause</button>
    </p>
    <p class="box">
        视频 zIndex: <input type="text" value="0" id="vIndexEl"> 
        图片1 zIndex: <input type="text" value="0" id="imgIndexEl1"> 
        花好月圆 zIndex: <input type="text" value="0" id="imgIndexEl2"> 
    </p>
    <p>
        <button id="changeButton">change</button>
    </p>
    <p id="current">
    
    </p>
    <p>
        <canvas id="timeline-canvas" width="640", height="20"></canvas>
    </p>

html {
  font-family: monospace;
  color: #333;
}
#canvas {
  width: 640px;
  height: 360px;
}
#current {
  font-size: 12px;
}
input {
  width: 50px;
}
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 {
  -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;
}