generge

<canvas id="c"></canvas>
    <div id="loading">
      <div>
        <div>...loading...</div>
        <div class="progress"><div id="progressbar"></div></div>
      </div>
    </div>
  <script  type="importmap">{
	"imports": {
		"three": "https://threejs.org/build/three.module.js",