- 技术博客
- 2、Css、js写时钟
技术点
css3 transform元素添加
成果
代码
<!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: #abc7d3 url(111.jpg);
background-size: cover;
font-family: 'helvetica neue';
text-align: center;
font-size: 10px;
}
body {
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);
background-color:rgba(0,0,0,0.7)
}
.clock-face {
position: relative;
width: 100%;
height: 100%;
transform: translateY(-3px);
}
.clock-face:after {
width: .8em;
height: .8em;
left: 50%;
top: 50%;
position: absolute;
display: block;
transform: translate(-50%, -50%);
content: '';
background-color: #a8c5d1;
border-radius: 50%;
box-shadow:
0 0 0 2px rgba(0, 0, 0, 0.1),
0 0 10px rgba(0, 0, 0, 0.2);
}
.hand {
width: 50%;
background: #fff;
position: absolute;
top: 50%;
right: 50%;
box-shadow:
0 0 0 .1px #fff,
0 0 0 1px rgba(0, 0, 0, 0.1),
0 0 8px rgba(0, 0, 0, 0.4),
2px 5px 1px rgba(0, 0, 0, .5);
transform-origin: 100% 50%;
transform: rotate(90deg);
transition-timing-function: cubic-bezier(0.9, 0.54, 0.26, 1.68);
}
.second-hand {
height: 2px;
margin-top: -1px;
border-bottom-left-radius: 100%;
border-top-left-radius: 100%;
transition: all .05s cubic-bezier(0.9, 0.54, 0.26, 1.68);
background-color: red;
}
.min-hand {
width: 45%;
height: 5px;
margin-top: -2.5px;
transition: all .1s cubic-bezier(0.9, 0.54, 0.26, 1.68);
}
.hour-hand {
width: 40%;
height: 10px;
margin-top: -5px;
border-bottom-left-radius: .5em;
border-top-left-radius: .5em;
transition: all 3s;
}
.num {
width: 30%;
height: 50%;
transform-origin: 100% 90%;
top: 5%;
right: 50%;
color: #a8c5d1;
position: absolute;
}
.num div{
position: absolute;
}
</style>
<script>
var clock = document.getElementsByClassName('clock-face')[0];
for (let i = 1; i < 13; i++) {
var time = document.createElement('div');
var time_div = document.createElement('div');
var text = document.createTextNode(i);
time_div.appendChild(text);
time.appendChild(time_div);
time.classList.add('num');
time.style.transform = `rotate(${i*30+35}deg)`;
time_div.style.transform = `rotate(${-(i*30+35)}deg)`;
clock.appendChild(time);
}
for(let i = 1;i<61;i++){
var pointer = document.createElement('div');
var text = document.createTextNode('.');
pointer.appendChild(text);
pointer.classList.add('num');
pointer.style.transform = `rotate(${i*6+2}deg)`;
clock.appendChild(pointer);
}
setInterval(setDate, 1000);
var hourHand = document.getElementsByClassName('hour-hand')[0];
var minHand = document.getElementsByClassName('min-hand')[0];
var secondHand = document.getElementsByClassName('second-hand')[0];
function setDate() {
var time = new Date();
var second = time.getSeconds();
var minutes = time.getMinutes();
var hours = time.getHours();
var secDeg = 90 + (second / 60) * 360;
var minuDeg = 90 + (minutes / 60) * 360;
var houDeg = 90 + (hours / 12) * 360 + (minutes / 12 / 60) * 360;
if (secDeg === 90) secondHand.style.transition = 'all 0s';
else secondHand.style.transition = 'all 0.05s';
if (minuDeg === 90) minHand.style.transition = 'all 0s';
else minHand.style.transition = 'all 0.1s'
secondHand.style.transform = `rotate(${secDeg}deg)`;
minHand.style.transform = `rotate(${minuDeg}deg)`;
hourHand.style.transform = `rotate(${houDeg}deg)`;
}
</script>
</body>
</html>
问题
刻度和数字位置不太准确
