CSS时钟
绘制时钟并不难，只要理解css基础知识和时钟角度转换就能很快实现。这里我借助vue简单实现时钟。先看效果：
第一步：计算角度绘制表盘
// 初始化刻度
initClockScale() {
let time = [12,3,6,9], timePos = [{left: '50%', top: '0'},{left: '100%', top: '50%'},{left: '50%', top: '100%'},{left: '0', top: '50%'}], angle = 30, idx = 0;
let scale = document.getElementById('scale');
if(!scale) return;
for(let i = 0; i < time.length; i++) {
idx++;
let elTime = this.createScale(angle, idx, time[i]);
elTime.style.top = timePos[i].top;
elTime.style.left = timePos[i].left;
scale.appendChild(elTime);
scale.appendChild(this.createScale(angle, idx)) && idx++;
scale.appendChild(this.createScale(angle, idx)) && idx++;
}
},
// 创建指针
createScale(angle, idx, content) {
let m1 = document.createElement('div');
m1.style.position = 'absolute';
if(content) {
m1.innerText = content;
m1.style.color = '#CCCCCC';
m1.style.transform = 'translate(-50%, -50%)';
}else {
m1.style.top = '0';
m1.style.left = '50%';
m1.style.width = '4px';
m1.style.height = '8px';
m1.style.transform = 'rotate('+ angle * idx +'deg)';
m1.style.transformOrigin = '0 calc(85px)';
m1.style.backgroundColor = '#CCCCCC';
}
return m1;
},
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第二步：获取时间更新指针
let nowTime = new Date();
this.milliSecond = nowTime.getMilliseconds();
this.second = nowTime.getSeconds();
this.minute = nowTime.getMinutes();
this.hour = nowTime.getHours();
// 初始化指针
initClockPointer() {
// 计算秒钟角度
let sAngle = (this.second + this.milliSecond / 1000) / 60 * 360;
this.secondAngle = sAngle.toFixed(2);
// 计算分针角度
let mAngle = (sAngle / 3600 / 60 + this.minute / 60) * 360;
this.minuteAngle = mAngle.toFixed(2);
// 计算时针角度，注意时钟是12刻度不是60刻度
let hAngle = (mAngle / 3600 / 60 + (this.hour > 12 ? (this.hour - 12) : this.hour) / 12) * 360 ;
this.hourAngle = hAngle.toFixed(2);
}
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完整代码：
<template>
<div class="pages">
<div class="clock">
<div class="scale" id="scale"></div>
<div class="hour" :style="{transform: 'rotate('+hourAngle+'deg)'}"></div>
<div class="minute" :style="{transform: 'rotate('+minuteAngle+'deg)'}"></div>
<div class="second" :style="{transform: 'rotate('+secondAngle+'deg)'}"></div>
<div class="dot"></div>
</div>
</div>
</template>
<script>
export default {
data() {
return {
secondAngle: 0,
minuteAngle: 0,
hourAngle: 0
}
},
methods: {
// 初始化刻度
initClockScale() {
let time = [12,3,6,9], timePos = [{left: '50%', top: '0'},{left: '100%', top: '50%'},{left: '50%', top: '100%'},{left: '0', top: '50%'}], angle = 30, idx = 0;
let scale = document.getElementById('scale');
if(!scale) return;
for(let i = 0; i < time.length; i++) {
idx++;
let elTime = this.createScale(angle, idx, time[i]);
elTime.style.top = timePos[i].top;
elTime.style.left = timePos[i].left;
scale.appendChild(elTime);
scale.appendChild(this.createScale(angle, idx)) && idx++;
scale.appendChild(this.createScale(angle, idx)) && idx++;
}
},
// 初始化指针
initClockPointer() {
// 计算秒钟角度
let sAngle = (this.second + this.milliSecond / 1000) / 60 * 360;
this.secondAngle = sAngle.toFixed(2);
// 计算分针角度
let mAngle = (sAngle / 3600 / 60 + this.minute / 60) * 360;
this.minuteAngle = mAngle.toFixed(2);
// 计算时针角度
let hAngle = (mAngle / 3600 / 60 + (this.hour > 12 ? (this.hour - 12) : this.hour) / 12) * 360 ;
this.hourAngle = hAngle.toFixed(2);
},
// 创建指针
createScale(angle, idx, content) {
let m1 = document.createElement('div');
m1.style.position = 'absolute';
if(content) {
m1.innerText = content;
m1.style.color = '#CCCCCC';
m1.style.transform = 'translate(-50%, -50%)';
}else {
m1.style.top = '0';
m1.style.left = '50%';
m1.style.width = '4px';
m1.style.height = '8px';
m1.style.transform = 'rotate('+ angle * idx +'deg)';
m1.style.transformOrigin = '0 calc(85px)';
m1.style.backgroundColor = '#CCCCCC';
}
return m1;
},
// 开始时针
startClock() {
let that = this;
// 整合毫秒差
setTimeout(function() {
that.initClockPointer();
that.milliSecond = 0;
setInterval(function() {
// 固定间隔，直接获取时间，避免程序运行的误差
let nowTime = new Date();
that.milliSecond = nowTime.getMilliseconds();
that.second = nowTime.getSeconds();
that.minute = nowTime.getMinutes();
that.hour = nowTime.getHours();
that.initClockPointer();
}, 1000);
}, 1000 - that.milliSecond);
}
},
mounted() {
let nowTime = new Date();
this.milliSecond = nowTime.getMilliseconds();
this.second = nowTime.getSeconds();
this.minute = nowTime.getMinutes();
this.hour = nowTime.getHours();
this.initClockScale();
this.startClock();
console.log(this.hour);
}
}
</script>
<style scoped lang="scss">
.pages {
display: flex;
align-items: center;
justify-content: center;
width: 100vw;
height: 100vh;
background: #002B36;
.clock {
position: relative;
width: 200px;
height: 200px;
border-radius: 50%;
box-shadow: inset 0 -3px 5px 2px rgba(255,255,255,.1);
.scale {
position: absolute;
left: 15px;
top: 15px;
width: 170px;
height: 170px;
// 基准线
// &::before {
// content: '';
// position: absolute;
// top: 0;
// left: 50%;
// width: 1px;
// height: 100%;
// background: white;
// }
// &::after {
// content: '';
// position: absolute;
// top: 50%;
// left: 0;
// width: 100%;
// height: 1px;
// background: white;
// }
}
.dot {
position: absolute;
left: 50%;
top: 50%;
width: 15px;
height: 15px;
border-radius: 50%;
transform: translate(-50%, -50%);
background: #CCCCCC;
}
.hour {
position: absolute;
top: calc(50% - 40px);
left: calc(50% - 4px);
width: 8px;
height: 40px;
border-radius: 8px;
transform: rotate(30deg);
transform-origin: bottom;
background: #710909;
}
.minute {
position: absolute;
top: calc(50% - 50px);
left: calc(50% - 3px);
width: 5px;
height: 50px;
border-radius: 5px;
transform: rotate(45deg);
transform-origin: bottom;
background: black;
}
.second {
position: absolute;
top: 40px;
left: calc(50% - 1px);
width: 2px;
height: 80px;
border-radius: 2px;
transform: rotate(360deg);
transform-origin: 50% 60px;
background: white;
}
}
}
</style>
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在线尝试：时钟demo
上次更新: 2025/09/05, 8:09:00