javascript - rete.js 示例页面不起作用我该怎么办？

Question

控制台没有错误。只有空页面出来，它不起作用。我应该怎么办？我会尝试在 npm 上安装它。即使通过相对路径连接也是如此。我不知道该怎么办。

<div id="rete"></div>
const numSocket = new Rete.Socket('Number value');
class NumComponent extends Rete.Component {
    constructor() {
      super('Number');
    }
  
    builder(node) {
      let out = new Rete.Output('num', 'Number', numSocket);
  
      node.addOutput(out);
    }
  
    worker(node, inputs, outputs) {
      outputs['num'] = node.data.num;
    }
  }
const container = document.querySelector('#rete');
const editor = new Rete.NodeEditor('demo@0.1.0', container);

editor.use(ConnectionPlugin)
editor.use(VueRenderPlugin)

const numComponent = new NumComponent();
editor.register(numComponent);
const engine = new Rete.Engine('demo@0.1.0');
engine.register(numComponent);

editor.on('process nodecreated noderemoved connectioncreated connectionremoved', async () => {
    await engine.abort();
    await engine.process(editor.toJSON());
});