css制作时钟
CSS 制作时钟的方法
使用纯CSS和少量JavaScript可以创建一个动态的时钟。以下是实现步骤:
HTML结构
<div class="clock">
<div class="hour-hand"></div>
<div class="minute-hand"></div>
<div class="second-hand"></div>
<div class="center-dot"></div>
</div>
CSS样式
.clock {
width: 200px;
height: 200px;
border: 10px solid #333;
border-radius: 50%;
position: relative;
margin: 50px auto;
background: #fff;
}
.hour-hand, .minute-hand, .second-hand {
position: absolute;
left: 50%;
bottom: 50%;
transform-origin: bottom center;
}
.hour-hand {
width: 6px;
height: 60px;
background: #333;
margin-left: -3px;
}
.minute-hand {
width: 4px;
height: 80px;
background: #666;
margin-left: -2px;
}
.second-hand {
width: 2px;
height: 90px;
background: red;
margin-left: -1px;
}
.center-dot {
width: 12px;
height: 12px;
background: #333;
border-radius: 50%;
position: absolute;
top: 50%;
left: 50%;
margin: -6px 0 0 -6px;
}
JavaScript动态效果
function updateClock() {
const now = new Date();
const hours = now.getHours() % 12;
const minutes = now.getMinutes();
const seconds = now.getSeconds();
const hourDegrees = (hours * 30) + (minutes * 0.5);
const minuteDegrees = minutes * 6;
const secondDegrees = seconds * 6;
document.querySelector('.hour-hand').style.transform = `rotate(${hourDegrees}deg)`;
document.querySelector('.minute-hand').style.transform = `rotate(${minuteDegrees}deg)`;
document.querySelector('.second-hand').style.transform = `rotate(${secondDegrees}deg)`;
}
setInterval(updateClock, 1000);
updateClock();
纯CSS时钟(无JavaScript)
使用CSS动画也可以创建时钟,但需要预先定义所有可能的位置:
.second-hand {
animation: rotate 60s linear infinite;
}
.minute-hand {
animation: rotate 3600s linear infinite;
}
.hour-hand {
animation: rotate 43200s linear infinite;
}
@keyframes rotate {
from { transform: rotate(0deg); }
to { transform: rotate(360deg); }
}
添加时钟刻度
.clock::before {
content: '';
position: absolute;
width: 100%;
height: 100%;
border-radius: 50%;
}
.clock::after {
content: '';
position: absolute;
width: 90%;
height: 90%;
top: 5%;
left: 5%;
border-radius: 50%;
background: #fff;
}
/* 添加12个刻度 */
.clock .tick {
position: absolute;
width: 2px;
height: 10px;
background: #333;
left: 50%;
top: 0;
margin-left: -1px;
transform-origin: bottom center;
}
/* 创建12个刻度元素 */
<div class="clock">
<!-- 之前的指针元素 -->
<div class="tick" style="transform: rotate(0deg)"></div>
<div class="tick" style="transform: rotate(30deg)"></div>
<!-- 继续添加其他刻度... -->
</div>
这些方法可以创建一个功能完整的CSS时钟,第一种方法使用JavaScript实现实时更新,第二种方法使用纯CSS动画但时间不会与实际时间同步。可以根据需求选择适合的实现方式。







