无法使用jquery ajax实现跟随-取消跟随按钮

<button id="followButton">跟随</button>

var followButton = document.getElementById("followButton");
var isFollowing = false;

followButton.addEventListener("click", function() {
  if (isFollowing) {
    // 取消跟随
    followButton.textContent = "跟随";
    followButton.classList.remove("following");
    isFollowing = false;
  } else {
    // 跟随
    followButton.textContent = "取消跟随";
    followButton.classList.add("following");
    isFollowing = true;
  }
});

.following {
  background-color: green;
  color: white;
}