向弹出菜单添加处理程序

<button id="menuButton">菜单</button>
<ul id="menu">
  <li><a href="#" id="option1">选项1</a></li>
  <li><a href="#" id="option2">选项2</a></li>
  <li><a href="#" id="option3">选项3</a></li>
</ul>

#menu {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 120px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  padding: 12px 16px;
  z-index: 1;
}

#menu li {
  list-style-type: none;
}

#menu li a {
  text-decoration: none;
  color: #333;
}

#menu li a:hover {
  color: #000;
}

var menuButton = document.getElementById("menuButton");
var menu = document.getElementById("menu");

menuButton.addEventListener("click", function() {
  menu.style.display = "block";
});

menuButton.addEventListener("blur", function() {
  menu.style.display = "none";
});

document.getElementById("option1").addEventListener("click", function() {
  // 执行选项1的处理程序
});

document.getElementById("option2").addEventListener("click", function() {
  // 执行选项2的处理程序
});

document.getElementById("option3").addEventListener("click", function() {
  // 执行选项3的处理程序
});