如何在微调器下拉单击时打开新活动

<select id="mySelect">
  <option value="activity1">活动1</option>
  <option value="activity2">活动2</option>
  <option value="activity3">活动3</option>
</select>

document.getElementById("mySelect").addEventListener("change", function() {
  var selectedValue = this.value;
  
  if (selectedValue === "activity1") {
    window.open("activity1.html");
  } else if (selectedValue === "activity2") {
    window.open("activity2.html");
  } else if (selectedValue === "activity3") {
    window.open("activity3.html");
  }
});

document.getElementById("myButton").addEventListener("click", function() {
  var selectedValue = document.getElementById("mySelect").value;
  
  if (selectedValue === "activity1") {
    window.open("activity1.html");
  } else if (selectedValue === "activity2") {
    window.open("activity2.html");
  } else if (selectedValue === "activity3") {
    window.open("activity3.html");
  }
});