// ==UserScript==
// @name         学科网自动下载 · 猫爪脚本
// @name:zh-CN   学科网自动下载 · 猫爪脚本
// @namespace    https://github.com/qoderwork/zxxk-autodownload
// @version      1.1.0
// @description  在学科网 / AI职教（*.xkw.com、*.zxxk.com）的打包页、资源篮、资源详情页、列表页采集资料链接，形成下载队列，批量提交到“学科资料下载”服务，自动下载文件或标记“已发送到邮箱”。含配置面板、下载按钮、进度与日志。
// @author       QoderWork
// @match        *://*.xkw.com/*
// @match        *://*.zxxk.com/*
// @match        *://xkw.com/*
// @match        *://zxxk.com/*
// @run-at       document-idle
// @noframes
// @grant        GM_xmlhttpRequest
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// @connect      *
// @license      MIT
// ==/UserScript==

(function () {
  "use strict";

  /* ============ 存储与默认配置 ============ */
  var PREFIX = "zxxk_dl_";
  function sget(k, def) {
    try {
      var v = GM_getValue(PREFIX + k);
      return v === undefined ? def : v;
    } catch (e) {
      return def;
    }
  }
  function sset(k, v) {
    try {
      GM_setValue(PREFIX + k, v);
    } catch (e) {}
  }

  var DEFAULTS = {
    server: "", // 下载服务基础地址（末尾不带斜杠）
    username: "",
    password: "",
    email: "",
    delay: 4, // 每条之间等待秒数，避免触发当日/当周上限
    autoDownload: true // true=直接存盘；false=仅列出直链
  };
  var CFG = {
    server: sget("server", DEFAULTS.server).replace(/\/+$/, ""),
    username: sget("username", DEFAULTS.username),
    password: sget("password", DEFAULTS.password),
    email: sget("email", DEFAULTS.email),
    delay: parseFloat(sget("delay", DEFAULTS.delay)) || DEFAULTS.delay,
    autoDownload: sget("autoDownload", DEFAULTS.autoDownload) !== false
  };

  /* ============ 下载服务响应码 → 文案 ============ */
  var CODE_MSG = {
    "111": "账号或者密码输入错误",
    "222": "当天下载份数达到上限，请明天再试",
    "555": "本周下载份数达到上限，请下周一再试",
    "666": "当前材料为第三方，无权下载",
    "777": "本周剩余份数不足以下载本书",
    "888": "网址输入错误 / 无法解析",
    "1010": "出现异常，请刷新重试",
    "1020": "邮箱输入错误",
    "1030": "多个网址请分批次提交，请勿一次性提交",
    "1040": "当前账号未激活，请联系客服",
    "1050": "份数已全部用完，请重新续费",
    "1060": "获取下载记录异常，请重试",
    "1070": "当前账号已到期，请重新续费",
    "1080": "剩余份数不足以下载当前材料",
    "1090": "该网址已提交过，请勿重复提交"
  };

  /* ============ 队列数据 ============ */
  // item: { url, title, status, link, msg }
  var queue = sget("queue", []);
  try {
    if (typeof queue === "string") queue = JSON.parse(queue);
  } catch (e) {
    queue = [];
  }
  if (!Array.isArray(queue)) queue = [];

  var running = false;
  var stopFlag = false;

  /* ============ 工具函数 ============ */
  function esc(s) {
    return String(s == null ? "" : s).replace(
      /[&<>"']/g,
      function (c) {
        return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c];
      }
    );
  }

  // 从一行响应文本解析: code + rest（首个冒号后全部）
  function parseResp(text) {
    var d = (text || "").trim();
    var i = d.indexOf(":");
    if (i < 0) return { code: d, rest: "" };
    return { code: d.substring(0, i), rest: d.substring(i + 1) };
  }
  // 把 rest 拆成 name 与 payload（以第一个冒号分隔）
  function splitRest(rest) {
    var i = rest.indexOf(":");
    if (i < 0) return { name: rest.trim(), payload: "" };
    return { name: rest.substring(0, i).trim(), payload: rest.substring(i + 1).trim() };
  }

  function safeName(s, fallback) {
    var n = (s || "").trim().replace(/[\\/:*?"<>|\r\n]+/g, "_").replace(/\s+/g, " ");
    return n || fallback || "zxxk-file";
  }

  function log(msg) {
    var el = document.getElementById("zxxk-log");
    if (!el) return;
    var t = new Date().toLocaleTimeString("zh-CN", { hour12: false });
    var line = document.createElement("div");
    line.className = "zxxk-log-line";
    line.textContent = "[" + t + "] " + msg;
    el.appendChild(line);
    while (el.childNodes.length > 400) el.removeChild(el.firstChild);
    el.scrollTop = el.scrollHeight;
  }

  /* ============ GM_xmlhttpRequest 封装 ============ */
  function gmPost(url, body) {
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "POST",
        url: url,
        headers: {
          "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8"
        },
        data: body,
        timeout: 120000,
        onload: function (r) {
          resolve(r.responseText || "");
        },
        onerror: function (e) {
          reject(new Error("网络请求失败"));
        },
        ontimeout: function () {
          reject(new Error("请求超时"));
        }
      });
    });
  }

  function gmGetBlob(url, extraHeaders) {
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "GET",
        url: url,
        responseType: "arraybuffer",
        headers: Object.assign({ Referer: location.href }, extraHeaders || {}),
        timeout: 300000,
        onload: function (r) {
          resolve(r);
        },
        onerror: function () {
          reject(new Error("文件下载失败"));
        },
        ontimeout: function () {
          reject(new Error("文件下载超时"));
        }
      });
    });
  }

  // 从响应头解析文件名
  function filenameFromHeaders(headers) {
    if (!headers) return "";
    var m = /filename\*?=\s*(?:UTF-8'')?["']?([^"';\n]+)["']?/i.exec(headers);
    if (m) {
      try {
        return decodeURIComponent(m[1].trim());
      } catch (e) {
        return m[1].trim();
      }
    }
    return "";
  }

  function saveBlob(arrayBuffer, filename) {
    var blob = new Blob([arrayBuffer]);
    var objUrl = URL.createObjectURL(blob);
    var a = document.createElement("a");
    a.href = objUrl;
    a.download = safeName(filename, "zxxk-" + Date.now());
    document.body.appendChild(a);
    a.click();
    setTimeout(function () {
      document.body.removeChild(a);
      URL.revokeObjectURL(objUrl);
    }, 2000);
  }

  // 下载直链文件（444 / 4443）
  function downloadDirect(fileUrl, title) {
    return gmGetBlob(fileUrl).then(function (r) {
      var name =
        filenameFromHeaders(r.responseHeaders) ||
        safeName(title, "zxxk-" + Date.now());
      saveBlob(r.response, name);
      return name;
    });
  }

  // 教材下载（4442）：向 DownloadJiaofu 提交 path 换取文件
  function downloadJiaofu(path, name) {
    var url = CFG.server + "/DownloadJiaofu";
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "POST",
        url: url,
        headers: { "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8" },
        data: "path=" + encodeURIComponent(encodeURI(path)),
        responseType: "arraybuffer",
        timeout: 300000,
        onload: function (r) {
          var fname =
            filenameFromHeaders(r.responseHeaders) ||
            name ||
            (function () {
              var b = path.lastIndexOf("\\");
              return b >= 0 ? path.substring(b + 1) : path;
            })();
          saveBlob(r.response, fname);
          resolve(fname);
        },
        onerror: function () {
          reject(new Error("教材下载失败"));
        },
        ontimeout: function () {
          reject(new Error("教材下载超时"));
        }
      });
    });
  }

  /* ============ 单条提交流程 ============ */
  function submitOne(item) {
    var body =
      "username=" + CFG.username +
      "&password=" + CFG.password +
      "&zxxkurl=" + item.url +
      "&usermail=" + CFG.email;

    return gmPost(CFG.server + "/zxxkdown", body).then(function (text) {
      var p = parseResp(text);
      var code = p.code, rest = p.rest;

      if (code === "444" || code === "4443") {
        var s = splitRest(rest);
        // 兼容无标题的情况：若 payload 以 "//" 开头，说明第一个冒号其实是协议里的，
        // 整个 rest 才是链接、标题为空。
        if (/^\/\//.test(s.payload)) {
          s = { name: "", payload: rest };
        }
        item.link = s.payload;
        if (CFG.autoDownload && s.payload) {
          return downloadDirect(s.payload, s.name || item.title)
            .then(function (fname) {
              item.status = "已下载";
              item.msg = fname;
            })
            .catch(function (err) {
              item.status = "下载失败";
              item.msg = (err && err.message) || "未知错误";
            });
        } else {
          item.status = "已解析";
          item.msg = "已生成直链，点击“打开”下载";
        }
        return;
      }

      if (code === "4442") {
        var s2 = splitRest(rest);
        if (CFG.autoDownload && s2.payload) {
          return downloadJiaofu(s2.payload, s2.name)
            .then(function (fname) {
              item.status = "已下载";
              item.msg = fname;
            })
            .catch(function (err) {
              item.status = "下载失败";
              item.msg = (err && err.message) || "未知错误";
            });
        } else {
          item.status = "已解析";
          item.msg = "教材待下载：" + s2.payload;
        }
        return;
      }

      if (code === "333" || code === "9333") {
        var s3 = splitRest(rest);
        item.status = "已发邮箱";
        item.msg = "材料将发送到邮箱，请 10 分钟后查收" + (s3.name ? "（" + s3.name + "）" : "");
        return;
      }

      // 其它为错误码
      item.status = "失败";
      item.msg = CODE_MSG[code] || rest || ("未知响应：" + (text || "").slice(0, 60));
      return;
    });
  }

  /* ============ 队列批处理 ============ */
  function processQueue() {
    if (running) return;
    var todo = queue.filter(function (it) {
      return it.checked !== false && (it.status === "待下载" || it.status === "重试");
    });
    if (!todo.length) {
      log("没有待下载的条目（先“采集”或勾选条目再点“开始下载”）。");
      return;
    }
    if (!CFG.username || !CFG.password) {
      log("请先在“配置”里填写账号与密码。");
      openConfig();
      return;
    }
    running = true;
    stopFlag = false;
    setRunningUI(true);
    log("开始下载，共 " + todo.length + " 条，间隔 " + CFG.delay + " 秒。");

    var chain = Promise.resolve();
    todo.forEach(function (item) {
      chain = chain.then(function () {
        if (stopFlag) return;
        item.status = "解析中";
        item.msg = "";
        renderList();
        return submitOne(item)
          .catch(function (err) {
            item.status = "失败";
            item.msg = (err && err.message) || "请求失败";
          })
          .then(function () {
            log(item.url + " → " + item.status + (item.msg ? "：" + item.msg : ""));
            renderList();
            if (!stopFlag) return sleep(CFG.delay * 1000);
          });
      });
    });
    chain.then(function () {
      running = false;
      setRunningUI(false);
      log(stopFlag ? "已停止。" : "全部处理完成。");
      updateProgress();
    });
  }

  function sleep(ms) {
    return new Promise(function (r) {
      setTimeout(r, ms);
    });
  }

  /* ============ 采集当前页链接 ============ */
  function collectLinks() {
    var found = 0;
    var seen = {};
    queue.forEach(function (it) {
      seen[it.url] = 1;
    });

    var anchors = document.querySelectorAll('a[href*="/doc/"]');
    anchors.forEach(function (a) {
      var href = a.href || "";
      var m = /\/doc\/(\d+)\.html?/i.exec(href);
      if (!m) return;
      var url = href.split("#")[0];
      var title =
        (a.textContent || "").trim() ||
        (a.getAttribute("title") || "").trim() ||
        (a.querySelector("img") && (a.querySelector("img").alt || "")) ||
        "资料 " + m[1];
      if (seen[url]) return;
      seen[url] = 1;
      queue.push({ url: url, title: title.slice(0, 80), status: "待下载", link: "", msg: "", checked: true });
      found++;
    });

    // 详情页：把当前页自身也加入
    if (/\/doc\/\d+\.html?/i.test(location.pathname)) {
      var selfUrl = location.origin + location.pathname;
      if (!seen[selfUrl]) {
        queue.push({
          url: selfUrl,
          title: (document.title || "当前资料").trim().slice(0, 80),
          status: "待下载",
          link: "",
          msg: "",
          checked: true
        });
        found++;
      }
    }

    sset("queue", JSON.stringify(queue));
    renderList();
    if (found === 0) {
      log("当前页面未发现可采集的资料链接（/doc/xxxx.html）。请在打包页、资源篮页、列表页或资源详情页操作。");
    } else {
      log("采集到 " + found + " 条新链接，队列共 " + queue.length + " 条。");
    }
  }

  /* ============ UI ============ */
  function buildUI() {
    GM_addStyle(
      [
        "#zxxk-fab{position:fixed;right:18px;bottom:18px;z-index:2147483646;width:52px;height:52px;border-radius:50%;",
        "background:linear-gradient(135deg,#ff5f6d,#ffc371);color:#fff;font-size:22px;line-height:52px;text-align:center;",
        "cursor:pointer;box-shadow:0 6px 18px rgba(0,0,0,.28);user-select:none;font-family:-apple-system,Segoe UI,Microsoft YaHei,sans-serif;}",
        "#zxxk-fab:hover{transform:translateY(-2px);}",
        "#zxxk-panel{position:fixed;right:18px;bottom:80px;z-index:2147483646;width:440px;max-height:78vh;display:none;",
        "flex-direction:column;background:#fff;color:#222;border-radius:12px;overflow:hidden;font-size:13px;",
        "box-shadow:0 12px 40px rgba(0,0,0,.28);font-family:-apple-system,Segoe UI,Microsoft YaHei,sans-serif;border:1px solid #eee;}",
        "#zxxk-panel.open{display:flex;}",
        ".zxxk-hd{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:#2b3a55;color:#fff;}",
        ".zxxk-hd b{font-size:14px;}",
        ".zxxk-hd .zxxk-hd-btns span{margin-left:12px;cursor:pointer;opacity:.9;}",
        ".zxxk-body{overflow:auto;padding:10px 12px;}",
        ".zxxk-cfg{display:none;background:#f6f8fb;border:1px solid #e6ebf2;border-radius:8px;padding:10px;margin-bottom:10px;}",
        ".zxxk-cfg.open{display:block;}",
        ".zxxk-row{display:flex;align-items:center;margin:6px 0;gap:8px;}",
        ".zxxk-row label{width:64px;color:#555;flex:none;}",
        ".zxxk-row input[type=text],.zxxk-row input[type=password]{flex:1;padding:6px 8px;border:1px solid #d4dbe6;border-radius:6px;box-sizing:border-box;font-size:13px;}",
        ".zxxk-row input[type=number]{width:80px;padding:6px;border:1px solid #d4dbe6;border-radius:6px;}",
        ".zxxk-inline{display:flex;align-items:center;gap:6px;color:#555;}",
        ".zxxk-tools{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px;}",
        ".zxxk-list{border:1px solid #eee;border-radius:8px;max-height:220px;overflow:auto;}",
        ".zxxk-item{display:flex;align-items:center;gap:8px;padding:7px 8px;border-bottom:1px solid #f2f2f2;}",
        ".zxxk-item:last-child{border-bottom:none;}",
        ".zxxk-item .ttl{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#333;}",
        ".zxxk-item .st{flex:none;font-size:12px;padding:2px 7px;border-radius:10px;background:#eef1f5;color:#667;}",
        ".zxxk-item .st.ok{background:#e6f6ec;color:#1d8348;}",
        ".zxxk-item .st.mail{background:#fff3e0;color:#b26a00;}",
        ".zxxk-item .st.err{background:#fdecea;color:#c0392b;}",
        ".zxxk-item .st.run{background:#e8f0fe;color:#1a56db;}",
        ".zxxk-item .op{flex:none;color:#1a73e8;cursor:pointer;margin-left:4px;}",
        ".zxxk-ft{display:flex;align-items:center;gap:8px;padding:10px 12px;border-top:1px solid #eee;background:#fafbfc;}",
        "button.zxxk-btn{border:none;border-radius:6px;padding:8px 14px;font-size:13px;cursor:pointer;background:#2b3a55;color:#fff;}",
        "button.zxxk-btn.ghost{background:#eef1f5;color:#334;}",
        "button.zxxk-btn.dl{background:linear-gradient(135deg,#ff5f6d,#ff8a5f);}",
        "button.zxxk-btn:disabled{opacity:.5;cursor:not-allowed;}",
        ".zxxk-log{margin-top:8px;border:1px solid #eee;border-radius:8px;background:#0f1720;color:#b9c6d6;font-size:11px;",
        "line-height:1.5;padding:8px;height:110px;overflow:auto;font-family:Menlo,Consolas,monospace;}",
        ".zxxk-prog{margin-left:auto;color:#666;font-size:12px;}",
        ".zxxk-empty{padding:18px;text-align:center;color:#aaa;}"
      ].join("")
    );

    var fab = document.createElement("div");
    fab.id = "zxxk-fab";
    fab.title = "学科网自动下载";
    fab.textContent = "🐾";
    document.body.appendChild(fab);

    var panel = document.createElement("div");
    panel.id = "zxxk-panel";
    panel.innerHTML =
      '<div class="zxxk-hd">' +
      '<b>学科网自动下载</b>' +
      '<div class="zxxk-hd-btns"><span id="zxxk-btn-cfg" title="配置">⚙</span><span id="zxxk-btn-close" title="收起">✕</span></div>' +
      "</div>" +
      '<div class="zxxk-body">' +
      '<div class="zxxk-cfg" id="zxxk-cfg">' +
      '<div class="zxxk-row"><label>服务地址</label><input type="text" id="c-server"></div>' +
      '<div class="zxxk-row"><label>账号</label><input type="text" id="c-username"></div>' +
      '<div class="zxxk-row"><label>密码</label><input type="password" id="c-password"></div>' +
      '<div class="zxxk-row"><label>邮箱</label><input type="text" id="c-email"></div>' +
      '<div class="zxxk-row"><label>间隔(秒)</label><input type="number" id="c-delay" min="0" step="0.5">' +
      '<span class="zxxk-inline"><input type="checkbox" id="c-auto"> 自动下载文件</span></div>' +
      '<div class="zxxk-row" style="justify-content:flex-end"><button class="zxxk-btn" id="c-save">保存配置</button></div>' +
      "</div>" +
      '<div class="zxxk-tools">' +
      '<button class="zxxk-btn" id="zxxk-collect">采集当前页链接</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-all">全选</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-none">全不选</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-clear">清空队列</button>' +
      "</div>" +
      '<div class="zxxk-list" id="zxxk-list"></div>' +
      '<div class="zxxk-log" id="zxxk-log"></div>' +
      "</div>" +
      '<div class="zxxk-ft">' +
      '<button class="zxxk-btn dl" id="zxxk-start">开始下载</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-stop" disabled>停止</button>' +
      '<span class="zxxk-prog" id="zxxk-prog"></span>' +
      "</div>";
    document.body.appendChild(panel);

    // 事件
    fab.onclick = function () {
      panel.classList.toggle("open");
      if (panel.classList.contains("open")) {
        renderList();
        updateProgress();
      }
    };
    document.getElementById("zxxk-btn-close").onclick = function () {
      panel.classList.remove("open");
    };
    document.getElementById("zxxk-btn-cfg").onclick = function () {
      toggleConfig();
    };

    document.getElementById("zxxk-collect").onclick = collectLinks;
    document.getElementById("zxxk-clear").onclick = function () {
      if (!queue.length) return;
      if (confirm("确定清空下载队列？")) {
        queue = [];
        sset("queue", "[]");
        renderList();
        updateProgress();
      }
    };
    document.getElementById("zxxk-all").onclick = function () {
      queue.forEach(function (i) {
        i.checked = true;
      });
      sset("queue", JSON.stringify(queue));
      renderList();
    };
    document.getElementById("zxxk-none").onclick = function () {
      queue.forEach(function (i) {
        i.checked = false;
      });
      sset("queue", JSON.stringify(queue));
      renderList();
    };
    document.getElementById("zxxk-start").onclick = processQueue;
    document.getElementById("zxxk-stop").onclick = function () {
      stopFlag = true;
      log("收到停止指令，将在当前条目完成后停止…");
    };

    // 配置表单
    document.getElementById("c-server").value = CFG.server;
    document.getElementById("c-username").value = CFG.username;
    document.getElementById("c-password").value = CFG.password;
    document.getElementById("c-email").value = CFG.email;
    document.getElementById("c-delay").value = CFG.delay;
    document.getElementById("c-auto").checked = CFG.autoDownload;
    document.getElementById("c-save").onclick = function () {
      CFG.server = document.getElementById("c-server").value.trim().replace(/\/+$/, "") || DEFAULTS.server;
      CFG.username = document.getElementById("c-username").value.trim();
      CFG.password = document.getElementById("c-password").value;
      CFG.email = document.getElementById("c-email").value.trim();
      CFG.delay = parseFloat(document.getElementById("c-delay").value) || 0;
      CFG.autoDownload = document.getElementById("c-auto").checked;
      sset("server", CFG.server);
      sset("username", CFG.username);
      sset("password", CFG.password);
      sset("email", CFG.email);
      sset("delay", CFG.delay);
      sset("autoDownload", CFG.autoDownload);
      log("配置已保存。");
      toggleConfig(false);
    };

    renderList();
    updateProgress();
  }

  function toggleConfig(force) {
    var el = document.getElementById("zxxk-cfg");
    if (!el) return;
    if (force === true || (force === undefined && !el.classList.contains("open"))) el.classList.add("open");
    else if (force === false) el.classList.remove("open");
    else el.classList.toggle("open");
  }
  function openConfig() {
    toggleConfig(true);
  }

  function statusClass(st) {
    if (st === "已下载" || st === "已解析") return "ok";
    if (st === "已发邮箱") return "mail";
    if (st === "失败" || st === "下载失败") return "err";
    if (st === "解析中") return "run";
    return "";
  }

  function renderList() {
    var box = document.getElementById("zxxk-list");
    if (!box) return;
    if (!queue.length) {
      box.innerHTML = '<div class="zxxk-empty">队列为空，点“采集当前页链接”开始</div>';
      updateProgress();
      return;
    }
    var html = "";
    queue.forEach(function (it, idx) {
      var chk = it.checked === false ? "" : "checked";
      var op = it.link
        ? '<span class="op" data-op="open" data-i="' + idx + '">打开</span>'
        : "";
      html +=
        '<div class="zxxk-item">' +
        '<input type="checkbox" ' + chk + ' data-op="chk" data-i="' + idx + '">' +
        '<span class="ttl" title="' + esc(it.url) + '">' + esc(it.title || it.url) + "</span>" +
        '<span class="st ' + statusClass(it.status) + '">' + esc(it.status || "待下载") + "</span>" +
        op +
        "</div>";
    });
    box.innerHTML = html;

    Array.prototype.forEach.call(box.querySelectorAll("[data-op]"), function (el) {
      var i = parseInt(el.getAttribute("data-i"), 10);
      var op = el.getAttribute("data-op");
      if (op === "chk") {
        el.onchange = function () {
          queue[i].checked = el.checked;
          sset("queue", JSON.stringify(queue));
          updateProgress();
        };
      } else if (op === "open") {
        el.onclick = function () {
          var u = queue[i].link;
          if (u) window.open(u, "_blank");
        };
      }
    });
    updateProgress();
  }

  function updateProgress() {
    var el = document.getElementById("zxxk-prog");
    if (!el) return;
    var total = queue.length;
    var done = queue.filter(function (i) {
      return i.status === "已下载" || i.status === "已发邮箱" || i.status === "已解析";
    }).length;
    var fail = queue.filter(function (i) {
      return i.status === "失败" || i.status === "下载失败";
    }).length;
    el.textContent = total ? "完成 " + done + " / " + total + (fail ? "（失败 " + fail + "）" : "") : "";
  }

  function setRunningUI(on) {
    var s = document.getElementById("zxxk-start");
    var st = document.getElementById("zxxk-stop");
    if (s) s.disabled = on;
    if (st) st.disabled = !on;
  }

  /* ============ 启动 ============ */
  if (document.body) buildUI();
  else window.addEventListener("DOMContentLoaded", buildUI);
})();