将多个项从ListBox1添加到绑定多项ListBox2

// 获取ListBox1和ListBox2的DOM元素
var listBox1 = document.getElementById("listBox1");
var listBox2 = document.getElementById("listBox2");

// 获取选中的项
var selectedItems = [];
for (var i = 0; i < listBox1.options.length; i++) {
  if (listBox1.options[i].selected) {
    selectedItems.push(listBox1.options[i]);
  }
}

// 将选中的项添加到ListBox2
for (var i = 0; i < selectedItems.length; i++) {
  listBox2.appendChild(selectedItems[i]);
}

// 引入Express框架
const express = require("express");
const app = express();

// 处理POST请求，将选中的项添加到ListBox2
app.post("/addItems", (req, res) => {
  // 获取选中的项
  var selectedItems = req.body.selectedItems;

  // 将选中的项添加到ListBox2的逻辑
  // ...

  res.send("Items added to ListBox2 successfully");
});

// 启动服务器
app.listen(3000, () => {
  console.log("Server started on port 3000");
});