如何在选定项目并按下按钮后将其从列表框中删除

// HTML
<select id="listbox">
  <option value="1">项目1</option>
  <option value="2">项目2</option>
  <option value="3">项目3</option>
</select>
<button onclick="deleteSelected()">删除选定项目</button>

// JavaScript
function deleteSelected() {
  var listbox = document.getElementById("listbox");
  var selectedIndex = listbox.selectedIndex;
  if (selectedIndex !== -1) {
    listbox.remove(selectedIndex);
  }
}

from flask import Flask, request, render_template

app = Flask(__name__)

@app.route("/", methods=["GET", "POST"])
def index():
    if request.method == "POST":
        selected_index = int(request.form.get("selected_index"))
        delete_selected(selected_index)
    return render_template("index.html")

def delete_selected(selected_index):
    # 从数据源中删除选定项目
    # ...

if __name__ == "__main__":
    app.run()