Last active
May 15, 2018 00:03
-
-
Save miyaoka/b37254f01393e84abdaa628587a9cc54 to your computer and use it in GitHub Desktop.
presentation timer
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
let sec = 60 * 8 | |
const alertSec = 60 | |
let timer | |
let alertTimer | |
const d = document.createElement('div') | |
const pad = (s) => `00${s}`.slice(-2) | |
const update = () => { | |
d.innerText = `${pad(Math.floor(sec / 60))} : ${pad(sec % 60)}` | |
} | |
const stop = () => { | |
void [timer, alertTimer].forEach((t) => { | |
clearInterval(t) | |
t = undefined | |
}) | |
} | |
const toggleTimer = () => { | |
if (timer) { | |
stop() | |
return | |
} | |
timer = setInterval(() => { | |
sec -= 1 | |
if (sec < alertSec && !alertTimer) { | |
alertTimer = setInterval(() => { | |
d.style.color = '#' + (((1 << 24) * Math.random()) | 0).toString(16) | |
}, 10) | |
} | |
if (sec <= 0) { | |
stop() | |
} | |
update() | |
}, 1000) | |
} | |
d.style.cssText = ` | |
position: fixed; | |
font-size: 48px; | |
right: 10px; | |
top: 10px; | |
line-height: 1; | |
color: #fff; | |
text-shadow: 0 0 8px #000; | |
z-index: 2147483647; | |
cursor: pointer; | |
font-family: 'Passion One', cursive; | |
` | |
d.addEventListener('click', toggleTimer) | |
$('body').append(d) | |
$('head').append( | |
`<link href='https://fonts.googleapis.com/css?family=Passion+One' rel='stylesheet' type='text/css'>` | |
) | |
update() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment