使用CSS关键帧创建计数器

Question

是否可以通过更改元素内容来使用关键帧创建动画计数器？

例如:

.loop:before{
    animation: loop 10s linear;
}

@keyframes loop {
    0% {
        content: '0';
    }
    10% {
        content: '10';
    }
    20% {
        content: '20';
    }
    30% {
        content: '30';
    }
    40% {
        content: '40';
    }
    50% {
        content: '50';
    }
    60% {
        content: '60';
    }
    70% {
        content: '70';
    }
    80% {
        content: '80';
    }
    90% {
        content: '90';
    }
}

万一这是不可能的,有没有办法用HTML/CSS,没有JavaScript？

Answer 1

该content属性不能通过@keyframes或可操作transition,但是有一种方法可以通过使用带有文本的伪元素0 10 20 30 40 50 60 70 80 90和动画其margin-top属性来实现.

div {
  position: relative;
  width: 20px;
  height: 20px;
  border: 1px solid black;
  overflow: hidden;
}
div:after {
  content: attr(data-val);
  position: absolute;
  top: 0;
  left: 0;
  line-height: 20px;
  text-align: center;
  -webkit-animation: loop 10s linear;
  animation: loop 10s linear;
}
@-webkit-keyframes loop {
  0% { margin-top: 0px; }
  9% { margin-top: 0px; }
  10% { margin-top: -20px; }
  19% { margin-top: -20px; }
  20% { margin-top: -40px; }
  29% { margin-top: -40px; }
  30% { margin-top: -60px; }
  39% { margin-top: -60px; }
  40% { margin-top: -80px; }
  49% { margin-top: -80px; }
  50% { margin-top: -100px; }
  59% { margin-top: -100px; }
  60% { margin-top: -120px; }
  69% { margin-top: -120px; }
  70% { margin-top: -140px; }
  79% { margin-top: -140px; }
  80% { margin-top: -160px; }
  89% { margin-top: -160px; }
  90% { margin-top: -180px; }
  99% { margin-top: -180px; }
  100% { margin-top: -200px; }
}
@keyframes loop {
  0% { margin-top: 0px; }
  9% { margin-top: 0px; }
  10% { margin-top: -20px; }
  19% { margin-top: -20px; }
  20% { margin-top: -40px; }
  29% { margin-top: -40px; }
  30% { margin-top: -60px; }
  39% { margin-top: -60px; }
  40% { margin-top: -80px; }
  49% { margin-top: -80px; }
  50% { margin-top: -100px; }
  59% { margin-top: -100px; }
  60% { margin-top: -120px; }
  69% { margin-top: -120px; }
  70% { margin-top: -140px; }
  79% { margin-top: -140px; }
  80% { margin-top: -160px; }
  89% { margin-top: -160px; }
  90% { margin-top: -180px; }
  99% { margin-top: -180px; }
  100% { margin-top: -200px; }
}

<div class="loop" data-val="0 10 20 30 40 50 60 70 80 90"></div>