Enhancer for YouTube 日本語字幕

カスタムスクリプト.js

(async () => {
  const waitAsync = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

  document.querySelector(".ytp-settings-button").click();

  await waitAsync(500);
  let items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");

  let ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText.includes("字幕")) {
      ok = true;
      item.click();
    }
  }
  if (!ok) {
    return;
  }

  await waitAsync(500);
  items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");
  ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText === "オフ") {
      ok = true;
      item.click();
    }
  }
  if (!ok) {
    return;
  }

  items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");

  ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText.includes("字幕")) {
      ok = true;
      item.click();
    }
  }
  if (!ok) {
    return;
  }

  await waitAsync(500);
  items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");

  ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText.includes("日本語")) {
      ok = true;
      item.click();
      return;
    }
  }
  if (!ok) {
    for (const item of Array.from(items)) {
      if (item.innerText.includes("英語")) {
        ok = true;
        item.click();
      }
    }
  }
  if (!ok) {
    return;
  }

  await waitAsync(500);
  items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");

  ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText.includes("字幕")) {
      ok = true;
      item.click();
    }
  }
  if (!ok) {
    return;
  }

  await waitAsync(500);
  items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");

  ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText.includes("自動翻訳")) {
      ok = true;
      item.click();
    }
  }
  if (!ok) {
    return;
  }

  await waitAsync(500);
  items = document.querySelectorAll(".ytp-settings-menu .ytp-menuitem-label");

  ok = false;
  for (const item of Array.from(items)) {
    if (item.innerText.includes("日本語")) {
      ok = true;
      item.click();
    }
  }
  if (!ok) {
    return;
  }
})();