Why are Three.js examples not working?

Question

JavaScript

I'm trying to run the three.js examples, but I get a simple page with an empty canvas. Created a local server on the node. The pages display normally, but the scenes themselves do not work. What could be the problem?

const express = require('express');
const app = express();

app.use(express.static('three.js-master/examples'));

app.get('/', (req, res) => {
  res.sendFile('three.js-master/examples/canvas_materials_normal.html', {root: __dirname});
});

app.listen(3000, () => { console.log(`Server work on port 3000...`); })

Answer 1

on the server run