如何从角度材质选择列表中获取选定列表选项并将其作为Json数组发送

<select id="material-select">
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

<script>
  const selectElement = document.getElementById('material-select');
  selectElement.addEventListener('change', handleSelectChange);

  function handleSelectChange(event) {
    const selectedOption = event.target.value;
    const dataToSend = JSON.stringify([selectedOption]);
    // 发送数据给后端...
  }
</script>

const express = require('express');
const app = express();
const bodyParser = require('body-parser');

app.use(bodyParser.json());

app.post('/process', (req, res) => {
  const selectedOptions = req.body;
  // 处理选项数据...
  // 返回处理结果给前端...
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});