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stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"m18 16l4-4l-4-4M6 8l-4 4l4 4m8.5-12l-5 16\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":33},"\u003Cg fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\">\u003Crect width=\"18\" height=\"18\" x=\"3\" y=\"3\" rx=\"2\" ry=\"2\"\u002F>\u003Ccircle cx=\"9\" cy=\"9\" r=\"2\"\u002F>\u003Cpath d=\"m21 15l-3.086-3.086a2 2 0 0 0-2.828 0L6 21\"\u002F>\u003C\u002Fg>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":35},"\u003Cg fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\">\u003Crect width=\"18\" height=\"18\" x=\"3\" y=\"3\" rx=\"2\"\u002F>\u003Cpath d=\"M16 8.9V7H8l4 5l-4 5h8v-1.9\"\u002F>\u003C\u002Fg>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":37},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M6 11h4M8 9v4m7-1h.01M18 10h.01m-.69-5H6.68a4 4 0 0 0-3.978 3.59l-.017.152C2.604 9.416 2 14.456 2 16a3 3 0 0 0 3 3c1 0 1.5-.5 2-1l1.414-1.414A2 2 0 0 1 9.828 16h4.344a2 2 0 0 1 1.414.586L17 18c.5.5 1 1 2 1a3 3 0 0 0 3-3c0-1.545-.604-6.584-.685-7.258q-.01-.075-.017-.151A4 4 0 0 0 17.32 5\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":39},"\u003Cg fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\">\u003Cpath d=\"M11.017 2.814a1 1 0 0 1 1.966 0l1.051 5.558a2 2 0 0 0 1.594 1.594l5.558 1.051a1 1 0 0 1 0 1.966l-5.558 1.051a2 2 0 0 0-1.594 1.594l-1.051 5.558a1 1 0 0 1-1.966 0l-1.051-5.558a2 2 0 0 0-1.594-1.594l-5.558-1.051a1 1 0 0 1 0-1.966l5.558-1.051a2 2 0 0 0 1.594-1.594zM20 2v4m2-2h-4\"\u002F>\u003Ccircle cx=\"4\" cy=\"20\" r=\"2\"\u002F>\u003C\u002Fg>","\u003Cblockquote>\n\u003Cp>屏幕自动息屏本身是省电的好事，问题出在它不分场合：你正等 AI 把代码跑完、或者把网页 Demo 投屏给一屋子人看，它偏偏黑了。这时你要的不是"永久别息屏"，而是"\u003Cstrong>就这一会儿别黑，完事自动恢复\u003C\u002Fstrong>"——选错方案，要么忘了改回来天天费电，要么折腾半天装软件。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>\u003Cimg src=\"\u002Fblog\u002Fkeep-screen-awake-without-settings\u002Fcover.webp\" alt=\"临时撑住屏幕保持常亮，旁边的屏幕已自动息屏\">\u003C\u002Fp>\n\u003Ch2>屏幕为什么动不动就自动黑掉？\u003C\u002Fh2>\n\u003Cp>屏幕自动息屏是操作系统的省电策略：检测到一段时间没有键鼠操作，就先息屏、再锁屏或休眠。这个超时时间在系统设置里，默认通常几分钟。问题在于它只认"有没有操作"，不认"你在不在看"——你盯着屏幕等进度、或在讲解投屏内容，手没动，系统就以为你离开了。理解这一点很关键：\u003Cstrong>所有防息屏方案，本质都是在告诉系统"我还在，别睡"\u003C\u002Fstrong>，区别只在用什么方式、管多大范围。\u003C\u002Fp>\n\u003Ch2>改系统设置"永不息屏"行不行？\u003C\u002Fh2>\n\u003Cp>改系统设置当然行，但它是把"局部临时"的需求用"全局长期"的开关来解决，代价不小：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>容易忘记改回来\u003C\u002Fstrong>：临时改成"永不"，用完忘了调回去，屏幕长亮费电、笔记本掉电快；\u003C\u002Fli>\n\u003Cli>\u003Cstrong>移动端常没这选项\u003C\u002Fstrong>：很多手机\u002F平板的息屏时间最长只能设到几分钟或"30 分钟"，没有"永不"；\u003C\u002Fli>\n\u003Cli>\u003Cstrong>粒度太粗\u003C\u002Fstrong>：你只想在等编译的 20 分钟内别黑，却让全天所有场景都不息屏。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>所以改系统设置适合"长期、全局确实需要屏幕常亮"的场景（比如固定当监控屏），不适合临时需求。\u003C\u002Fp>\n\u003Ch2>临时需要、又不想装软件，最省事的是什么？\u003C\u002Fh2>\n\u003Cp>临时防息屏最省事的是\u003Cstrong>浏览器里的屏幕常亮网页\u003C\u002Fstrong>：打开页面、点一下开关，屏幕就保持常亮；关掉页面、切走、或按 ESC，一切恢复原样，完全不动系统设置。它背后用的是浏览器标准的 \u003Cstrong>Screen Wake Lock API\u003C\u002Fstrong>，所以无需安装任何软件，跨系统通用。\u003C\u002Fp>\n\u003Cp>\u003Ca href=\"\u002Fdev\u002FwakeLock\u002F\">屏幕常亮工具\u003C\u002Fa> 就是这条路，还顺手做了两件实用的事：可设定时关闭（比如 30 分钟自动解除，免得忘）、可选纯白\u002F纯黑\u002FAI 工作视频做背景。开启常亮并选择「AI 工作视频」背景时的效果：\u003C\u002Fp>\n\u003Cp>\u003Cvideo src=\"\u002Fdev\u002Fclaude-code-work.mp4\" controls playsinline loop muted autoplay>\u003C\u002Fvideo>\u003C\u002Fp>\n\u003Cp>它最适合这些"用完即走"的瞬间：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>全屏等 Cursor、Claude Code、Codex 等 AI 把代码跑完，不想中途黑屏；\u003C\u002Fli>\n\u003Cli>双屏办公，第二块屏保持某页面常亮，主屏继续干活；\u003C\u002Fli>\n\u003Cli>浏览器里做网页 Demo 并把窗口投屏出去演示。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>哪些情况它不适用？\u003C\u002Fh2>\n\u003Cp>它有一个明确边界：\u003Cstrong>页面必须保持在前台可见\u003C\u002Fstrong>。浏览器规定页面不可见时自动释放 Wake Lock（出于省电和安全），所以以下情况它管不了：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>切到 PowerPoint、Keynote、Zoom 等其他应用后，指望它在后台继续防息屏；\u003C\u002Fli>\n\u003Cli>切到浏览器的其他标签页后仍要常亮；\u003C\u002Fli>\n\u003Cli>需要全局、永久的防息屏。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>这些场景应该改系统设置，或装 Caffeine（macOS）、PowerToys Awake（Windows）这类系统级工具。\u003C\u002Fp>\n\u003Ch2>三种方式怎么选？\u003C\u002Fh2>\n\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth>方式\u003C\u002Fth>\n\u003Cth>适合什么时候\u003C\u002Fth>\n\u003Cth>代价\u003C\u002Fth>\n\u003C\u002Ftr>\n\u003C\u002Fthead>\n\u003Ctbody>\n\u003Ctr>\n\u003Ctd>改系统设置\u003C\u002Ftd>\n\u003Ctd>长期、全局需要常亮\u003C\u002Ftd>\n\u003Ctd>易忘记改回、移动端可能无"永不"\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>Caffeine \u002F PowerToys 等\u003C\u002Ftd>\n\u003Ctd>需后台防息屏、不依赖浏览器\u003C\u002Ftd>\n\u003Ctd>需安装，部分环境无权限\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>浏览器屏幕常亮网页\u003C\u002Ftd>\n\u003Ctd>临时、零安装、用完即恢复\u003C\u002Ftd>\n\u003Ctd>页面必须保持前台可见\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003C\u002Ftbody>\n\u003C\u002Ftable>\n\u003Cp>判断标准就一句话：\u003Cstrong>需求是不是"临时 + 本页可见"\u003C\u002Fstrong>。是，就用网页防息屏；要切到别的应用还保持常亮，就用系统设置或专门软件。\u003C\u002Fp>\n\u003Ch2>小结\u003C\u002Fh2>\n\u003Cp>屏幕老黑掉的真正解法，是先分清你要的是"永久"还是"这一会儿"。\u003Cstrong>长期全局需求改系统设置；要在后台\u002F切应用也生效装 Caffeine 类工具；只是临时、用完即走、又不想动设置，用浏览器屏幕常亮网页最省事\u003C\u002Fstrong>——它跨系统、零安装、关掉自动恢复，唯一前提是页面保持在前台可见。\u003C\u002Fp>\n",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":42},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M15 14c.2-1 .7-1.7 1.5-2.5c1-.9 1.5-2.2 1.5-3.5A6 6 0 0 0 6 8c0 1 .2 2.2 1.5 3.5c.7.7 1.3 1.5 1.5 2.5m0 4h6m-5 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