examples/doc_resource_preload.html from spritejs/spritejs

examples/doc_resource_preload.html
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="/js/spritejs.js"></script>
  <script src="//lib.baomitu.com/dat-gui/0.7.2/dat.gui.min.js"></script>
  <style>
    #adaptive {
      width: 100%;
      padding-bottom: 50%;
      background: #eee;
    }
  </style>
</head>
<body>
  <div id="adaptive"></div>
  <script>
    const {Scene, Sprite, Label} = spritejs;
    const container = document.getElementById('adaptive');
    const scene = new Scene({
      container,
      width: 1200,
      height: 600,
      // contextType: '2d',
    });
    const layer = scene.layer();

    (async function () {
      await scene.preload({
        id: 'robot',
        src: 'https://p5.ssl.qhimg.com/t01c33383c0e168c3c4.png',
      });

      const robot = new Sprite('robot');
      robot.attr({
        anchor: [0.5, 0.5],
        pos: [600, 300],
        scale: 0.5,
      });
      layer.append(robot);

      const label = new Label(`图片大小： ${robot.contentSize}`);
      label.attr({
        anchor: [0.5, 0.5],
        pos: [600, 100],
        font: '36px Arial',
      });
      layer.append(label);
    }());
  </script>
</body>
</html>