全屏时钟 使用教程
详细使用指南、最佳实践与常见问题解答
使用场景
全屏时钟适用于演示倒计时、会议室时间管理、教室限时考试、番茄工作法、直播背景时钟、运动训练计时等场景。无需安装应用,浏览器即开即用,一键全屏放大。
Use Cases
The fullscreen clock is ideal for countdowns in presentations, meeting time management, classroom exams, Pomodoro, live-stream backgrounds, and sports training. No app install needed — runs in the browser with one-click fullscreen.
功能特点
- 三种模式:系统时间(实时时钟)/ 秒表(计时)/ 倒计时(定时)
- 一键全屏:大字号显示,适合投影与远处观看
- 时钟模式:可选 12/24 小时制、显示秒、显示日期(含星期)
- 秒表模式:厘秒精度、计次功能、计次列表(显示总时与分次时)
- 倒计时模式:时/分/秒输入、进度条、到点蜂鸣提示(三声)
- 暂停/继续:秒表与倒计时均支持暂停后继续
- 本地运行:无需联网,完全在浏览器中工作
Features
- Three modes: System time (live clock) / Stopwatch / Countdown
- One-click fullscreen: large digits for projection and viewing from a distance
- Clock mode: 12/24-hour toggle, optional seconds, optional date with weekday
- Stopwatch: centisecond precision, lap timing, lap list (total + split)
- Countdown: hours/minutes/seconds input, progress bar, triple beep at zero
- Pause/Resume: supported for both stopwatch and countdown
- Local: no network needed, runs entirely in the browser
使用示例
示例 1：场景一:会议倒计时 — 切到倒计时,设 15:00,点全屏投影到屏幕,到点蜂鸣提示散会。
示例 2：场景二:教室限时考试 — 切到时钟模式,显示 24 小时制 + 秒 + 日期,全屏投影让学生随时掌握进度。
示例 3：场景三:运动训练 — 切到秒表,计次记录每圈用时,适合跑步、HIIT 训练。
示例 4：场景四:番茄工作法 — 切到倒计时,设 25:00 专注 / 5:00 休息,循环使用。
Examples
Example 1: Scenario 1: Meeting countdown — switch to Countdown, set 15:00, fullscreen to projector; beeps at zero to end.
Example 2: Scenario 2: Exam timing — switch to Clock mode with 24-hour + seconds + date, fullscreen for students to track progress.
Example 3: Scenario 3: Sports training — switch to Stopwatch, lap each circuit for running or HIIT.
Example 4: Scenario 4: Pomodoro — switch to Countdown, 25:00 focus / 5:00 break, repeat.
最佳实践
- 投影前先按 F11 退出浏览器全屏,再用本工具的全屏按钮,避免双重全屏冲突
- 倒计时建议设置在 1 小时内,长时间建议用专门的番茄钟
- 蜂鸣音由 Web Audio API 生成,需浏览器允许音频播放;静音标签页将听不到
- ESC 键可退出全屏,与浏览器原生行为一致
Best Practices
- Before projecting, exit browser fullscreen (F11) first, then use this tool's fullscreen button to avoid conflicts
- Keep countdowns under 1 hour; for longer sessions use a dedicated Pomodoro tool
- Beeps use Web Audio API; needs audio permission — muted tabs will be silent
- Press ESC to exit fullscreen (same as browser native behavior)
常见问题
全屏后怎么退出?
按 ESC 键或再次点击"退出全屏"按钮。全屏状态由浏览器管理,行为与原生全屏一致。
倒计时到点有声音吗?
有,会播放三声 880 Hz 蜂鸣提示音。注意浏览器若处于静音状态将听不到;首次播放可能需要用户与页面交互过(浏览器自动播放策略)。
秒表精度多少?
厘秒(1/100 秒)精度,刷新频率 20 Hz。足以满足绝大多数计时场景,但不适合专业赛事级计时。
关闭浏览器后计时还在吗?
不在。计时状态保存在内存中,刷新或关闭页面会丢失。如需长时间记录建议使用专门的番茄钟工具。
FAQ
How do I exit fullscreen?
Press ESC or click "Exit Fullscreen". Fullscreen is managed by the browser, behaves like native fullscreen.
Does countdown beep at zero?
Yes, three 880 Hz beeps. Note: muted browser tabs will be silent; first playback may require prior user interaction (browser autoplay policy).
What's the stopwatch precision?
Centisecond (1/100 s), refreshed at 20 Hz. Sufficient for most timing scenarios but not professional race timing.
Does the timer persist after closing the browser?
No. State is in memory; refresh or close the page and it's lost. For long-term tracking use the dedicated Pomodoro tool.