window.addEventListener("updatedHeight", (event) => {
  let old = event.detail.height;
  alert(old);
  let newHeight = $(".chatbox_body")[0].scrollHeight;
  alert(newHeight);
  let height = $(".chatbox_body").scrollTop(newHeight - old);

  alert(height);

  window.livewire.emit("updateHeight", {
    height: height,
  });
  alert(height);
});

我尝试让height返回一个值，但它返回的却是一个对象