用HTML、CSS和JS打造冬日奇景：网页版漫天飞雪

2023-12-17 17:27:23

寒冬腊月，雪花纷飞，为大地披上了一层洁白的银装。当雪花在空中曼妙起舞时，心中不禁泛起一丝诗情画意。而现在，借助HTML、CSS和JS，我们可以在网页上轻松实现下雪特效，为用户营造一个冬日奇观。

HTML结构：创建雪花容器

<div id="snowflakes"></div>

CSS样式：定义雪花样式

#snowflakes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.snowflake {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: #fff;
  border-radius: 50%;
  animation: fall 5s linear infinite;
}

@keyframes fall {
  0% {
    top: 0;
  }
  100% {
    top: 100vh;
  }
}

JavaScript逻辑：产生和移动雪花

const snowflakes = document.getElementById("snowflakes");

function createSnowflake() {
  const snowflake = document.createElement("div");
  snowflake.classList.add("snowflake");
  snowflake.style.left = `${Math.random() * 100}vw`;
  snowflakes.appendChild(snowflake);
}

function moveSnowflakes() {
  const snowflakes = document.querySelectorAll(".snowflake");
  snowflakes.forEach((snowflake) => {
    const top = parseInt(snowflake.style.top) + 1;
    snowflake.style.top = `${top}px`;
    if (top > 100vh) {
      snowflake.style.top = "0px";
      snowflake.style.left = `${Math.random() * 100}vw`;
    }
  });
}

setInterval(createSnowflake, 100);
setInterval(moveSnowflakes, 50);