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css制作时钟

2026-02-12 11:51:35CSS

使用CSS制作时钟

通过CSS和少量JavaScript可以创建一个动态时钟。以下是实现步骤：

基本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>

基础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;
  background: #333;
  transform-origin: bottom center;
  left: 50%;
  bottom: 50%;
}

.hour-hand {
  width: 6px;
  height: 60px;
  margin-left: -3px;
}

.minute-hand {
  width: 4px;
  height: 80px;
  margin-left: -2px;
}

.second-hand {
  width: 2px;
  height: 90px;
  margin-left: -1px;
  background: red;
}

.center-dot {
  width: 12px;
  height: 12px;
  background: #333;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -6px;
  margin-top: -6px;
  z-index: 10;
}

JavaScript动态更新

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(); // 立即执行一次

添加刻度标记

/* 添加刻度标记 */
.clock::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 15px;
  background: #333;
  left: 50%;
  top: 10px;
  margin-left: -2px;
  transform-origin: 50% 90px;
}

/* 创建12个刻度 */
.clock {
  position: relative;
}

.clock::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 15px;
  background: #333;
  left: 50%;
  top: 10px;
  margin-left: -2px;
  transform-origin: 50% 90px;
}

/* 使用伪元素创建所有刻度 */
.clock::after {
  content: '';
  position: absolute;
  width: 2px;
  height: 8px;
  background: #666;
  left: 50%;
  top: 15px;
  margin-left: -1px;
  transform-origin: 50% 85px;
}

/* 创建60个刻度 */
.clock {
  counter-reset: ticks 60;
}

.clock::after {
  counter-increment: ticks -1;
  transform: rotate(calc(var(--i) * 6deg));
}

/* 需要JavaScript动态添加刻度 */