我在哈佛商学院的文件里有一个按钮。如何将变量添加到链接到外部站点的按钮？

<button id="myButton">点击我</button>

var button = document.getElementById("myButton");
button.addEventListener("click", function() {
  // 在这里编写您的代码
});

var button = document.getElementById("myButton");
button.addEventListener("click", function() {
  var myVariable = "变量的值";
  var currentUrl = window.location.href;
  var externalUrl = "https://www.example.com?variable=" + myVariable;
  window.location.href = externalUrl;
});