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index-START.html
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index-START.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS + CSS Clock</title>
</head>
<body>
<div class="clock">
<div class="clock-face">
<div class="hand">
<div class="hour-hand">
<span></span>
</div>
<div class="min-hand">
<span></span>
</div>
<div class="second-hand">
<span></span>
</div>
</div>
</div>
</div>
<style>
html {
background: #018DED url(https://unsplash.it/1500/1000?image=881&blur=5);
background-size: cover;
font-family: 'helvetica neue';
text-align: center;
font-size: 10px;
}
body {
margin: 0;
font-size: 2rem;
display: flex;
flex: 1;
min-height: 100vh;
align-items: center;
}
.clock {
width: 30rem;
height: 30rem;
border: 20px solid white;
border-radius: 50%;
margin: 50px auto;
position: relative;
padding: 2rem;
box-shadow:
0 0 0 4px rgba(0,0,0,0.1),
inset 0 0 0 3px #EFEFEF,
inset 0 0 10px black,
0 0 10px rgba(0,0,0,0.2);
}
.clock-face {
position: relative;
width: 100%;
height: 100%;
}
.clock-face:before {
content: '';
position: absolute;
top: 50%;
left: 50%;
transform: translate(calc(-50% - 3px), -50%);
width: 30px;
height: 30px;
border-radius: 100%;
background-color: #fff;
z-index: 2;
}
.hand {
width: 100%;
height: 100%;
position: absolute;
top: 50%;
left: 50%;
transform: translate(calc(-50% - 3px), -50% ) rotate(-90deg);
}
.hand div {
margin: auto;
position: absolute;
width: 100%;
height: 100%;
}
.hour-hand span {
width: 30%;
height: 6px;
background: black;
}
.min-hand span {
width: 45%;
height: 6px;
background: purple;
}
.second-hand span {
width: 50%;
height: 6px;
background: red;
}
.hand span{
display: block;
left: 50%;
top: 50%;
position: absolute;
transform: translate(-20%, -50%);
}
</style>
<script>
;(function(){
const secDom = document.querySelector('.second-hand');
const minDom = document.querySelector('.min-hand');
const hourDom = document.querySelector('.hour-hand');
function setClock(){
let now = new Date();
let secDeg = now.getSeconds() * 6 // 360 / 60
let minDeg = now.getMinutes() * 6 + now.getSeconds() * 6 / 60 // 360 / 60 一格/60=秒
let hourDeg = now.getHours() * 30 + now.getMinutes() * 30 / 60 // 360 / 12 一格/60=分
secDom.style.transform = `rotate(${secDeg}deg)`;
minDom.style.transform = `rotate(${minDeg}deg)`;
hourDom.style.transform = `rotate(${hourDeg}deg)`;
}
// 寫法1:setInterval
// setInterval(setClock, 1000);
// 寫法2:setTimeout
// function timeoutHandler(){
// setClock();
// setTimeout(timeoutHandler, 1000);
// }
// timeoutHandler();
// 寫法3:requestAnimationFrame
function animationHandler(){
setClock();
requestAnimationFrame(animationHandler);
}
animationHandler();
// ---------------------------
setClock(); // initial
})()
</script>
</body>
</html>