const followButton = tt.createFollowButton({
  type: "image",
  image: "images/follow-button.png",
  style: {
    left: 20,
    top: 40,
    width: 150,
    height: 40,
    lineHeight: 40,
    backgroundColor: "#ff0000",
    textColor: "#ffffff",
    textAlign: "center",
    fontSize: 16,
    borderRadius: 4,
    borderWidth: 1,
    borderColor: "#ff0000",
  },
});
function onTap(res) {
  const { buttonId, errCode, errMsg } = res;
  tt.showModal({
    title: "关注",
    content: `关注按钮id：${buttonId}, errCode: ${errCode}, 详细信息：${errMsg}`,
  });
}
followButton.onTap(onTap);
followButton.offTap(onTap);