css实现倒计时效果

一、实现效果截图

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（学习视频推荐：css视频教程）

二、实现原理

看到上图效果应该很容易猜到原理，纯CSS的话使用轮播。通过改变图片的margin-top，再加上亿点点动画，亿点点数字图片，就实现了。

使用PS建数字图片：

然后

架结构

三、实现细节

1、纯CSS轮播论坛里有很多这里就不细讲啦！

总之就是利用轮播的效果，让图片由下至上的动画实现

2、倒序摆放图片，因为倒计时间是由大到小的（废话）

3、给图片设置一个边框，平移时效果更佳

假设使用float: top 图片上下之间会出现一些间隔。但使用float: left 同时使用容器限制，使每一张图片换行，不会出现任何间隔

.countdown-container img{
    box-sizing: border-box;
    width: 25px;
    height: 40px;
    border: gray 1px solid;
    float: left;
}

4、小时和分钟的数字切换不能一股脑让他匀速切，得在中间加上停滞，最后用0.1%的时间让其完成切换

@keyframes min{
    0%,
    3.13%,
    3.23% {
        margin-top: 0;
    }
 
    3.23%,
    6.36%,
    6.46% {
        margin-top: -40px;
    }

5、时、分、秒容器的高度=图片数量*图片高度，动画的总时长= （图片数量+1) * 60(h/m/s) ，记得转换成秒哈

使用ease-out属性值，使切图时更加丝滑~

#countdown-container-min{
    height: 2400px;
    animation: min 1860s ease-out infinite;
}

四、全部代码

1、HTML

2、CSS

/* 倒计时器 */
.countdown{
    position: relative;
    height: 100px;
    width: 200px;
    margin: 50px;
}
 
/* 小时、分钟、秒之间的分号 : */
#countdown-s1{
    font-size: 30px;
    color: white;
    position: absolute;
    left: 67px;
    top: -3px;
}
 
#countdown-s2{
    font-size: 30px;
    color: white;
    position: absolute;
    left: 120px;
    top: -3px;
}
 
/* 倒计时器容器 */
.countdown-container{
    width: 25px;
    height: 40px;
    overflow: hidden;
    float: left;
    margin-left: 30px;
}
 
.countdown-container img{
    box-sizing: border-box;
    float: left;
    width: 25px;
    height: 40px;
    border: gray 1px solid;
}
 
/* 分钟轮播 */
#countdown-container-min{
    height: 2400px;
    /* 31min，需播放1860s, ease-out用于图片之间慢速停顿过渡*/
    animation: min 1860s ease-out infinite;
}
 
@keyframes min{
    0%,
    3.13%,      /*  加入停滞，使切换时的速度为0.1% */
    3.23% {
        margin-top: 0;
    }
 
    3.23%,
    6.36%,
    6.46% {
        margin-top: -40px;
    }
 
    6.46%,
    9.59%,
    9.69% {
        margin-top: -80px;
    }
 
    9.69%,
    12.82%,
    12.92%  {
        margin-top: -120px;
    }
 
    12.92%,
    16.05%,
    16.15% {
        margin-top: -160px;
    }
 
    16.15%,
    19.28%,
    19.38% {
        margin-top: -200px;
    }
  19.38%,
    22.51%,
    22.61% {
        margin-top: -240px;
    }
  22.61%,
    25.74%,
    25.84% {
        margin-top: -280px;
    }
  25.84%,
    28.97%,
    29.07% {
        margin-top: -320px;
    }
  29.07%,
    32.20%,
    32.30% {
        margin-top: -360px;
    }
  32.30%,
    35.43%,
    35.53% {
        margin-top: -400px;
    }
  35.53%,
    38.66%,
    38.76% {
        margin-top: -440px;
    }
  38.76%,
    41.89%,
    41.99% {
        margin-top: -480px;
    }
  41.99%,
    45.12%,
    45.22% {
        margin-top: -520px;
    }
  45.22%,
    48.35%,
    48.45% {
        margin-top: -560px;
    }
  48.45%,
    51.58%,
    51.68% {
        margin-top: -600px;
    }
  51.68%,
    54.81%,
    54.91% {
        margin-top: -640px;
    }
  54.91%,
    58.04%,
    58.14% {
        margin-top: -680px;
    }
  58.14%,
    61.27%,
    61.37% {
        margin-top: -720px;
    }
  61.37%,
    64.50%,
    64.60% {
        margin-top: -760px;
    }
  64.60%,
    67.73%,
    67.83% {
        margin-top: -800px;
    }
  67.83%,
    70.96%,
    71.06% {
        margin-top: -840px;
    }
  71.06%,
    74.19%,
    74.29% {
        margin-top: -880px;
    }
  74.29%,
    77.42%,
    77.52% {
        margin-top: -920px;
    }
  77.52%,
    80.65%,
    80.75% {
        margin-top: -960px;
    }
  80.75%,
    83.88%,
    83.98% {
        margin-top: -1000px;
    }
  83.98%,
    87.11%,
    87.21% {
        margin-top: -1040px;
    }
  87.21%,
    90.34%,
    90.44% {
        margin-top: -1080px;
    }
  90.44%,
    93.57%,
    93.67% {
        margin-top: -1120px;
    }
  93.67%,
    96.80%,
    96.90% {
        margin-top: -1160px;
    }
  96.90%,
    99.90%,
    100% {
        margin-top: -1200px;
    }
}
 
/* 秒轮播 */
#countdown-container-second{
    height: 2400px;
    animation: second 60s ease-out infinite;
}
 
@keyframes second {
    0%,
    1.66% {
        margin-top: 0;
    }
 
    1.66%,
    3.32% {
        margin-top: -40px;
    }
 
    3.32%,
    4.98% {
        margin-top: -80px;
    }
 
    4.98%,
    6.64% {
        margin-top: -120px;
    }
 
    6.64%,
    8.30% {
        margin-top: -160px;
    }
 
    8.30%,
    9.96% {
        margin-top: -200px;
    }
  9.96%,
    11.62% {
        margin-top: -240px;
    }
  11.62%,
    13.28% {
        margin-top: -280px;
    }
  13.28%,
    14.94% {
        margin-top: -320px;
    }
  14.94%,
    16.60% {
        margin-top: -360px;
    }
  16.60%,
    18.26% {
        margin-top: -400px;
    }
  18.26%,
    19.92% {
        margin-top: -440px;
    }
  19.92%,
    21.58% {
        margin-top: -480px;
    }
  21.58%,
    23.24% {
        margin-top: -520px;
    }
  23.24%,
    24.90% {
        margin-top: -560px;
    }
  24.90%,
    26.56% {
        margin-top: -600px;
    }
  26.56%,
    28.22% {
        margin-top: -640px;
    }
  28.22%,
    29.88% {
        margin-top: -680px;
    }
  29.88%,
    31.54% {
        margin-top: -720px;
    }
  31.54%,
    33.2% {
        margin-top: -760px;
    }
  33.20%,
    34.86% {
        margin-top: -800px;
    }
  34.86%,
    36.52% {
        margin-top: -840px;
    }
  36.52%,
    38.18% {
        margin-top: -880px;
    }
  38.18%,
    39.84% {
        margin-top: -920px;
    }
  39.84%,
    41.50% {
        margin-top: -960px;
    }
  41.50%,
    43.16% {
        margin-top: -1000px;
    }
  43.16%,
    44.82% {
        margin-top: -1040px;
    }
  44.82%,
    46.48% {
        margin-top: -1080px;
    }
  46.48%,
    48.14% {
        margin-top: -1120px;
    }
  48.14%,
    49.80% {
        margin-top: -1160px;
    }
  49.80%,
    51.46% {
        margin-top: -1200px;
    }
  51.46%,
    53.12% {
        margin-top: -1240px;
    }
  53.12%,
    54.78% {
        margin-top: -1280px;
    }
  54.78%,
    56.44% {
        margin-top: -1320px;
    }
  56.44%,
    58.10% {
        margin-top: -1360px;
    }
  58.10%,
    59.76% {
        margin-top: -1400px;
    }
  59.76%,
    61.42% {
        margin-top: -1440px;
    }
 
    61.42%,
    63.08% {
        margin-top: -1480px;
    }
              63.08%,
    64.74% {
        margin-top: -1520px;
    }
  64.74%,
    66.40% {
        margin-top: -1560px;
    }
 
    66.40%,
    68.06% {
        margin-top: -1600px;
    }
              68.06%,
    69.72% {
        margin-top: -1640px;
    }
  69.72%,
    71.38% {
        margin-top: -1680px;
    }
 
    71.38%,
    73.04% {
        margin-top: -1720px;
    }
              73.04%,
    74.70% {
        margin-top: -1760px;
    }
  74.70%,
    76.36% {
        margin-top: -1800px;
    }
 
    76.36%,
    78.02% {
        margin-top: -1840px;
    }
              78.02%,
    79.68% {
        margin-top: -1880px;
    }
  79.68%,
    81.34% {
        margin-top: -1920px;
    }
 
    81.34%,
    83.00% {
        margin-top: -1960px;
    }
              83.00%,
    84.66% {
        margin-top: -2000px;
    }
  84.66%,
    86.32% {
        margin-top: -2040px;
    }
 
    86.32%,
    87.98% {
        margin-top: -2080px;
    }
              87.98%,
    89.64% {
        margin-top: -2120px;
    }
  89.64%,
    91.30% {
        margin-top: -2160px;
    }
 
    91.30%,
    92.96% {
        margin-top: -2200px;
    }
              92.96%,
    94.62% {
        margin-top: -2240px;
    }
  94.62%,
    96.28% {
        margin-top: -2280px;
    }
 
    96.28%,
    97.94% {
        margin-top: -2320px;
    }
              97.94%,
    100% {
        margin-top: -2360px;
    }
}

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