26 lines
5.5 KiB
HTML
26 lines
5.5 KiB
HTML
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<html lang="zh-CN"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>tab-keepalive.md 修订附录 2026-10-19</title><style>
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</style></head><body><div class="wrap"><h1>《tab-keepalive.md》修订附录 2026-10-19</h1><div class="meta"><a href="../tab-keepalive.md">原报告</a> · 核对基线 commit <code>eac3717</code> · 总评审：<a href="../../../review/DCU_DesktopController_专家评审_2026-10-19.html">DCU_DesktopController_专家评审_2026-10-19.html</a></div><div class="card"><b>原报告：</b>Tab Keep-Alive（多 iframe 常驻）<br><b>时间线：</b>status: delivered，2026-09-16（eaafee1 / be26f4d）<br><b>原结论概要：</b>tabs.html 一标签一懒创建 iframe，visibility 切换不销毁文档；注入的 F5/⟳ 只刷新激活帧；明确不做后台降频。<p class="note">原文件保持不变；本附录逐条记录其结论在当前代码中的状态。</p></div><h2>逐条结论跟踪</h2><table><tr><th>编号</th><th>原结论 / 建议</th><th>当前状态</th><th>证据（文件:行号）</th><th>备注</th></tr><tr><td>TK-1</td><td>多 iframe 宿主 + visibility 切换</td><td class="st st-ok">已修复（已交付）</td><td><code>tabs.html:70-81, 100, 113</code></td><td></td></tr><tr><td>TK-2</td><td>F5/⟳ 只 reload .page-frame.active</td><td class="st st-ok">已修复（已交付）</td><td><code>esp32_server.py:126, 150, 166</code></td><td></td></tr><tr><td>TK-3</td><td>不做后台页降频（Out of Scope）</td><td class="st st-open">仍存在风险</td><td><code>tabs.html:76-81; js/common/polling.js:350-352</code></td><td>隐藏帧持续轮询挤占设备 6 个 socket（C-13）；电机页发送节拍在后台被节流（M-10）——建议重新评估此决策</td></tr></table><h2>相关新问题（详见总评审）</h2><div class="issue s1b" id="M-10"><h4><span class="sev s1">严重</span> [M-10] 周期发送与序列计时在后台标签被节流，且无可见性处理</h4><dl><dt>模块</dt><dd>电机控制/故障保护</dd><dt>位置</dt><dd><code>js/motor/main.js:2488; js/motor/seq.js:503</code></dd><dt>现象</dt><dd>周期发送用主线程 setInterval，序列保持用 setTimeout；隐藏 iframe/最小化后被浏览器降到 ≥1 s 乃至分钟级。只有状态轮询走 Worker。无 visibilitychange 停止/告警；WiFi 链路关窗时无停机。</dd><dt>风险</dt><dd>后台时控制节拍严重失真，序列时间轴不可预测。</dd><dt>修改建议</dt><dd>发送节拍迁入 tick.worker.js；visibilitychange 时提示或按策略安全停机；pagehide 时对 WiFi 也发停机（sendBeacon）。</dd></dl></div><div class="issue s2b" id="C-13"><h4><span class="sev s2">一般</span> [C-13] 对设备的并发轮询过多</h4><dl><dt>模块</dt><dd>CAN/公共层</dd><dt>位置</dt><dd><code>js/common/device-link.js:30; js/can.js:131, 424; js/can_monitor.js:487, 490; tabs.html:76-81; js/common/polling.js:350-352</code></dd><dt>现象</dt><dd>/system/status 被 Owner(1 Hz)、OTA 页(1 Hz)、can.js(5 s)、can_monitor(5 s) 同时轮询；/can/feedback 被抽屉与独立监控页各 1 Hz；隐藏 iframe 继续轮询，无可见性暂停与离线退避。README 称设备 httpd 仅 6 个 socket 且 lru_purge。</dd><dt>风险</dt><dd>连接被挤占驱逐，业务请求失败。</dd><dt>修改建议</dt><dd>状态统一由 Owner 广播；隐藏页暂停；离线指数退避。</dd></dl></div><h2>结论</h2><div class="card">共 3 条：已修复 2、部分修复 0、仍存在/存疑 1、已过时 0、无法在本仓库核实 0。</div></div></body></html>
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