在本文中，我们将使用 JS 构建一个生成雨水的容器。这是一场色彩随机的七彩雨。您可以随意使用颜色。首先，让我们看看我们在构建什么。

预览

在线演示地址：http://haiyong.site/qicaiyu

现在让我们看一下代码，我们如何让它工作。

HTML

<div class="rain-container"></div>

CSS

* {
  margin: 0;
  padding: 0;
}

.rain-container {
  position: relative;
  background: #000;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

i {
  position: absolute;
  height: 120px;
  border-radius: 0 0 999px 999px;
  animation: animate 5s linear infinite;
}

@keyframes animate {
  0% {
    transform: translateY(-120px);
  }
  100% {
    transform: translateY(calc(100vh + 120px));
  }
}

Javascript

const rainContainer = document.querySelector(".rain-container");

// 雨滴的背景颜色
const background = [
  "linear-gradient(transparent, aqua)",
  "linear-gradient(transparent, red)",
  "linear-gradient(transparent, limegreen)",
  "linear-gradient(transparent, white)",
  "linear-gradient(transparent, yellow)"
];

const amount = 100; // 雨滴的数量
let i = 0;

// 循环并创建雨滴，然后添加到rainContainer
while (i < amount) {
  //  创建和元素
  const drop = document.createElement("i");

  //   雨滴的 CSS 属性
  const raindropProperties = {
    width: Math.random() * 5 + "px",
    positionX: Math.floor(Math.random() * window.innerWidth) + "px",
    delay: Math.random() * -20 + "s",
    duration: Math.random() * 5 + "s",
    bg: background[Math.floor(Math.random() * background.length)],
    opacity: Math.random() + 0.2
  };

  //   设置雨滴样式
  drop.style.width = raindropProperties.width;
  drop.style.left = raindropProperties.positionX;
  drop.style.animationDelay = raindropProperties.delay;
  drop.style.animationDuration = raindropProperties.duration;
  drop.style.background = raindropProperties.bg;
  drop.style.opacity = raindropProperties.opacity;

  //   将雨滴添加到雨滴容器中
  rainContainer.appendChild(drop);
  i++;
}

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