css+html<仿vx气泡上升效果>

微信小程序官方的效果主要是通过canvas写的，实现起来可能不会像css动画这么繁琐，而且看起来会更加真实。

但是我就是想用css实现~~😏

知识点：

1.sass nth 数组下标获取

$colors:red blue pink;
...
.item{
  color:#{nth($color,1)}; //color:red;
}

2.sass @for样式遍历简写方式

3.place-content

在线代码

代码片段

<template>
  <div class="body">
    <div class="container">
      <img class="lid" src="https://res.wx.qq.com/mpres/htmledition/images/wxopen/wap_mockup@2.png" alt="" />
      <img class="trunk" src="https://res.wx.qq.com/mpres/htmledition/images/wxopen/wap_mockup_top@2.png" alt="" />
      <div class="bubble-box">
        <div class="bubble" v-for="b in 100" :key="b"></div>
      </div>
    </div>
  </div>
</template>

<script>
export default {};
</script>

<style lang="scss" scoped>
.body {
  width: 100%;
  height: 100vh;
  display: grid;
  place-content: end center;
  overflow: hidden;
  background: #fefefe;
}
.container {
  width: 500px;
  height: 342px;
  position: relative;
  img {
    width: 100%;
    position: absolute;
  }
  .lid {
    z-index: 1;
  }
  .trunk {
    z-index: 99;
  }
  .bubble-box {
    background: red;
    position: absolute;
    top: 220px;
    width: 72%;
    left: 18%;
  }
  .bubble {
    width: 50px;
    height: 50px;
    z-index: 2;
    border-radius: 50%;
    position: absolute;
  }
}
$bubbleColors: #6262ea #ffffff #eddc46 #7bed46;
@for $i from 0 to 100 {
  .bubble:nth-child(#{$i}) {
    $background: nth($bubbleColors, random(4));
    $width: random(70) + 30 + px;
    left: #{(random(72)) + "%"};
    width: $width;
    height: $width;
    animation: moveToTop#{$i} 10s linear #{random(60)}s infinite;
    background: #{$background + "b4"};
    border: 2px solid $background;
  }
  @keyframes moveToTop#{$i} {
    100% {
      transform: translate(random(400)- 200 + px, -100vh);
    }
  }
}
</style>