手动实现的b站评论区评论带图。需要在浏览器控制台中执行。可以上传任何B站允许上传的图片，并将其附加到评论（一般用户也可以评论带动图）

biliCommentWithPic.js

function getCrsfFromCookie() {
  return document.cookie.match(/(?<=bili_jct=).*?(?=;)/)?.[0] ?? undefined;
}
function buildFd(data = {}) {
  return Object.entries(data).reduce((fd, [key, value]) => {
    fd.append(key, value);
    return fd;
  }, new FormData());
}
async function selectImageFile() {
  const input = document.createElement("input");
  input.type = "file";
  input.style = "display:none;";
  document.body.append(input);
  input.click();
  return new Promise((resolve) => input.addEventListener("input", () => resolve(input.files[0])));
}
async function uploadImage(file, csrf) {
  const fd = buildFd({ csrf, file_up: file, category: "daily", biz: "new_dyn" });
  const pic = await fetch("https://api.bilibili.com/x/dynamic/feed/draw/upload_bfs", {
    body: fd,
    method: "POST",
    credentials: "include",
  }).then((res) => res.json());
  return pic.data;
}
/**
 * 带图评论
 * @param {string} csrf csrf token
 * @param {*} uploadResult 图片上传结果
 * @returns
 */
function commentWithPic(csrf, uploadResult) {
  const { image_url: img_src, image_width: img_width, image_height: img_height, img_size } = uploadResult;
  const pictures = JSON.stringify([{ img_src, img_width, img_height, img_size }]);
  /**
   * @param {number} commentAreaType 评论区类型。1是视频评论区；11是动态评论区
   * @param {number} commentAreaId 评论区id
   * @param {string} commentTextContent 评论内容
   */
  return function (commentAreaType, commentAreaId, commentTextContent) {
    const fd = buildFd({
      oid: commentAreaId,
      type: commentAreaType,
      message: commentTextContent,
      plat: 1,
      at_name_to_mid: "{}",
      pictures,
      has_vote_option: true,
      gaia_source: "main_web",
    });
    fd.append("type", 1); //视频评论区，type是1，动态评论区，type是11
    return fetch(`https://api.bilibili.com/x/v2/reply/add?csrf=${csrf}`, { body: fd, method: "POST", credentials: "include" });
  };
}

async function main() {
  const csrf = getCrsfFromCookie();
  if (!csrf) {
    alert("未能从Cookie中获取到csrf");
    return;
  }
  const image = await selectImageFile();
  const uploadResult = await uploadImage(image, csrf);
  const commentWithPicFn = commentWithPic(csrf, uploadResult);
  const commentResult = await commentWithPicFn(11, 287130401, "你好");
  console.log(commentResult);
}