function nowPostID() {
  // Thread Parents
  let IDs = document.getElementsByClassName("now");

  for (let i = 0; i < IDs.length; i++) {
    IDs[i].getElementsByTagName("h4")[0].innerHTML = "#" + IDs[i].id;
  }

  // Thread Children
  IDs = document.getElementsByClassName("thread-update");

  for (let i = 0; i < IDs.length; i++) {
    for (let k = 0; k < IDs[i].getElementsByTagName("li").length; k++) {
      IDs[i]
        .getElementsByTagName("li")
        [k].getElementsByTagName("h4")[0].innerHTML =
        "#" + IDs[i].getElementsByTagName("li")[k].id;
    }
  }
}

document.addEventListener("DOMContentLoaded", function () {
  nowPostID(document.body);
});