来源：如何实现项目中常见的环形旋转效果，找对思路很重要【渡一教育】

思路：JS计算每个元素的初始位置、CSS控制动画

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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  body {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;

  }

  .rotate {
    width: 600px;
    height: 600px;
    border: 2px solid #ccc;
    border-radius: 50%;
    position: relative;
    /* 容器正向旋转 */
    animation: rotate 20s linear infinite;
  }

  .rotate .item {
    width: 150px;
    height: 150px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }

  .rotate .item img {
    width: 100%;
    height: 100%;
    /* 图片反向旋转，抵消容器正向旋转 */
    animation: rotate 20s linear infinite reverse;
  }

  @keyframes rotate {
    to {
      transform: rotate(360deg);
    }
  }
</style>

<body>

  <div class="rotate">
    <div class="item">
      <img src="./imgs/KRtDLD_Ultra_Sword_Ability_Star_artwork.png" alt="">
    </div>
    <div class="item">
      <img src="./imgs/KRtDLD_Monster_Flame_Ability_Star_artwork.png" alt="">
    </div>
    <div class="item">
      <img src="./imgs/KRtDLD_Flare_Beam_Ability_Star_artwork.png" alt="">
    </div>
    <div class="item">
      <img src="./imgs/KRtDLD_Snow_Bowl_Ability_Star_artwork.png" alt="">
    </div>
    <div class="item">
      <img src="./imgs/KRtDLD_Grand_Hammer_Ability_Star_artwork.png" alt="">
    </div>
  </div>

  <script>
    const container = document.querySelector('.rotate')
    const imgs = document.querySelectorAll('.item')

    // 图片数量
    const count = imgs.length

    // 半径
    const r = container.clientWidth / 2

    // 均分角度
    const averageDeg = 360 / count

    for (let i = 0; i < count; i++) {
      // 实际角度
      let deg = averageDeg * i

      // 弧度
      let rad = deg * Math.PI / 180

      // 计算相对于圆心的坐标x,y
      let x = Math.sin(rad) * r,
        y = -Math.cos(rad) * r

      imgs[i].style.transform = `translate(calc(-50% + ${x}px), calc(-50% + ${y}px))`
    }
  </script>
</body>

</html>