css动画

css

1.利用css完成一个秒表动画，需要注意的地方：::before以及::after伪元素必须设置content:’’。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
<div class="stopwatch">
  <div class="stopwatch-top"></div>
</div>
<style type="text/css">
  .stopwatch {
    width: 30px;
    height: 30px;
    background-color: transparent;
    border-radius: 50% 50%;
    border: 2px solid #fff;
    position: relative;
  }
  .stopwatch::before, .stopwatch::after {
    content: '';
    position: absolute;
    top: 14px;
    left: 15px;
    height: 2px;
    background-color: #fff;
    transform-origin: 1px 1px; // 分针以及时针的旋转中心点
  }
  /* 分针 */
  .stopwatch::before {
    width: 15px;
      animation: fen 1s linear infinite; // 1s内完成动画，匀速，无限动画
  }
  /* 时针 */
  .stopwatch::after {
    width: 9px;
    animation: hour 60s linear infinite; // 同理
  }
  @keyframes fen {
    0% {transform: rotate(0deg);}
    100% {transform: rotate(360deg);}
  }
  @keyframes hour {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  /* 秒表顶部柱头，也可以不画 */
  .stopwatch-top {
    position: absolute;
    width: 2px;
    height: 6px;
    left: 14px;
    top: -6px;
    background-color: #fff;
  }
</style>

2.电池充电动画

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
<div class="battery"></div>
<style type="text/css">
  .battery {
    width: 40px;
    height: 20px;
    border: 2px solid #fff;
    border-radius: 2px;
    position: relative;
    background-color: transparent;
    animation: battery 5s linear infinite;
  }
  /* 电池正极 */
  .battery::after {
    content: '';
    width: 2px;
    height: 10px;
    background-color: #fff;
    border: 0 2px 2px 0;
    position: absolute;
    top: 5px;
    right: -4px;
  }
  /* 充电动画，利用box-shadow: inset */
  @keyframes battery {
    0% { box-shadow: inset 0 0 0 #fff; };
    100% { box-shadow: inset 40px 0 0 #fff; };
  }
</style>