效果展示
代码展示
<!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 hour-hand"></div>
<div class="hand min-hand"></div>
<div class="hand second-hand"></div>
</div>
</div>
<style>
html {
background: #018DED;
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%;
transform: translateY(-3px);
/* account for the height of the clock hands */
}
.hand {
width: 50%;
height: 6px;
background: black;
position: absolute;
top: 50%;
transform-origin: 100%;
transform: rotate(90deg);
transition: all 0.05s;
transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
}
</style>
<script>
(function () {
let secondHand = document.querySelector('.second-hand');
let minHand = document.querySelector('.min-hand');
let hourHand = document.querySelector('.hour-hand');
function setClock() {
let now = new Date();
let secondDeg = now.getSeconds() * 6 + 90; // 从 12 点起算，而初始位置为 9 点，需加 90 度
let minDeg = now.getMinutes() * 6 + now.getSeconds() / 60 * 6 + 90;
let hourDeg = now.getHours() * 30 + now.getMinutes() / 60 * 30 + 90;
secondHand.style.transform = `rotate(${secondDeg}deg)`;
minHand.style.transform = `rotate(${minDeg}deg)`;
hourHand.style.transform = `rotate(${hourDeg}deg)`;
// console.log(second.style.transform);
}
// 方法1
// setClock();
// setInterval(setClock, 1000);
// 方法2
function animationHandler() {
setClock();
window.requestAnimationFrame(animationHandler, 1000);
}
window.requestAnimationFrame(animationHandler, 1000); // 可当做是能够处理画面更新的 setTimeout
})();
</script>
</body>
</html>
参考
