CSS3实现实时时间数字滚动

1，首先是CSS核心点，利用writing-mode: vertical-lr; text-orientation:upright;把文本设置为竖向排列，详细代码如下：

 .scroll-time-container {
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 25px;
    }
.scroll-time-wrap {
        line-height: 1;
        height: 30px;
        overflow: hidden;
    }
    .scroll-time {
        line-height: 0.6;
        writing-mode: vertical-lr;
        text-orientation: upright;
        transform: translateY(0%);
        transition: all .3s ease-in-out;
    }

2，实现基本样式，示例如下：
在这里插入图片描述
3，HTML模板代码：

<div class="scroll-time-container"&gt;
  <div class="scroll-time-wrap"&gt;
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[0]}0%)`}"&gt;0123456789</div&gt;
    </div&gt;
    <div class="scroll-time-wrap"&gt;
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[1]}0%)`}"&gt;0123456789</div&gt;
    </div>
    月
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[2]}0%)`}">0123456789</div>
    </div>
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[3]}0%)`}">0123456789</div>
    </div>
    日
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[4]}0%)`}">0123456789</div>
    </div>
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[5]}0%)`}">0123456789</div>
    </div>
    :
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[6]}0%)`}">0123456789</div>
    </div>
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[7]}0%)`}">0123456789</div>
    </div>
    :
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[8]}0%)`}">0123456789</div>
    </div>
    <div class="scroll-time-wrap">
        <div class="scroll-time" :style="{transform: `translateY(-${scrollTimeData[9]}0%)`}">0123456789</div>
    </div>
</div>

4，JS核心代码：

startScroll() {
   let scroll = () => {
        let date = new Date();
        let dateStr = '';
        let s = date.getSeconds();
        s = s > 9 ? s : '0' + s;
        let m = date.getMinutes();
        m = m > 9 ? m : '0' + m;
        let h = date.getHours();
        h = h > 9 ? h : '0' + h;
        let d = date.getDate();
        d = d > 9 ? d : '0' + d;
        let M = date.getMonth() + 1;
        M = M > 9 ? M : '0' + M;
        dateStr = M + d + h + m + s;

        this.scrollTimeData = dateStr.split('');
    }
    scroll();
    this.timer = setInterval(() => {
        scroll();
    }, 1000)
}

思路分析：
获取当前时间的时分秒，小于10补0，dateStr.split(‘’)得到数组["0", "2", "1", "7", "1", "5", "5", "5", "5", "9"]，看到这里，想必大家已经很明白了吧，数组对应的就是HTML模板中的 scrollTimeData[0] 到 scrollTimeData[9]。由于设置了过渡属性transition: all .3s ease-in-out;因此数组中每个数字发生变化，内联样式:style="{transform: translateY(-${scrollTimeData[xxx]}0%)}”的值发生变化时，便会产生一个滚动的效果。