使 Div 出现在圣诞节前后

Question

我想问一个问题，我对 html 几乎一无所知，我想在页面上应用雪花效果。我从这里得到代码并添加了它，但我想让它在 11 月 1 日到 12 月 31 日期间出现，然后自动消失，明年再次出现。谁能帮我弄清楚我该怎么做。

codepen.io/codeconvey/pen/xRzQay

此外，这可能是制作此作品的人的问题，但有没有快速的方法可以让它下雪更多的雪花？

谢谢！

Answer 1

    var d = new Date()

if(d.getMonth() < 10){ //starts counting from 0
  var snows = document.getElementById("snows");
  snows.remove();
}

我也给你的雪花添加了一个id div。

您可以通过添加更多雪花来增加雪花的数量

<div class="snowflake">
  ❄
  </div>

进入你的 html.

Answer 2

正如我在评论中所说，您需要使用 JS 获取当前日期并检查它是否在 11 月 1 日和 12 月 31 日之间。简而言之，您只需要月份。 JS计算索引为零的月份（一月为0，十二月为11）。在您的情况下，您只需要检查月份是 10 还是 11（无需检查日期和年份）

/* https://pajasevi.github.io/CSSnowflakes/ */

if (new Date().getMonth() == 10 || new Date().getMonth() == 11) {
  var children = document.getElementById('snowflakes').children;
  for (let i = 0; i < children.length; i++) {
    children[i].classList.add('snowflake');
  }
}

body {
  background: red;
}


/* customizable snowflake styling */

.snowflake {
  color: #fff;
  font-size: 1em;
  font-family: Arial;
  text-shadow: 0 0 1px #000;
}

@-webkit-keyframes snowflakes-fall {
  0% {
    top: -10%
  }
  100% {
    top: 100%
  }
}

@-webkit-keyframes snowflakes-shake {
  0% {
    -webkit-transform: translateX(0px);
    transform: translateX(0px)
  }
  50% {
    -webkit-transform: translateX(80px);
    transform: translateX(80px)
  }
  100% {
    -webkit-transform: translateX(0px);
    transform: translateX(0px)
  }
}

@keyframes snowflakes-fall {
  0% {
    top: -10%
  }
  100% {
    top: 100%
  }
}

@keyframes snowflakes-shake {
  0% {
    transform: translateX(0px)
  }
  50% {
    transform: translateX(80px)
  }
  100% {
    transform: translateX(0px)
  }
}

.snowflake {
  position: fixed;
  top: -10%;
  z-index: 9999;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  cursor: default;
  -webkit-animation-name: snowflakes-fall, snowflakes-shake;
  -webkit-animation-duration: 10s, 3s;
  -webkit-animation-timing-function: linear, ease-in-out;
  -webkit-animation-iteration-count: infinite, infinite;
  -webkit-animation-play-state: running, running;
  animation-name: snowflakes-fall, snowflakes-shake;
  animation-duration: 10s, 3s;
  animation-timing-function: linear, ease-in-out;
  animation-iteration-count: infinite, infinite;
  animation-play-state: running, running
}

.snowflake:nth-of-type(0) {
  left: 1%;
  -webkit-animation-delay: 0s, 0s;
  animation-delay: 0s, 0s
}

.snowflake:nth-of-type(1) {
  left: 10%;
  -webkit-animation-delay: 1s, 1s;
  animation-delay: 1s, 1s
}

.snowflake:nth-of-type(2) {
  left: 20%;
  -webkit-animation-delay: 6s, .5s;
  animation-delay: 6s, .5s
}

.snowflake:nth-of-type(3) {
  left: 30%;
  -webkit-animation-delay: 4s, 2s;
  animation-delay: 4s, 2s
}

.snowflake:nth-of-type(4) {
  left: 40%;
  -webkit-animation-delay: 2s, 2s;
  animation-delay: 2s, 2s
}

.snowflake:nth-of-type(5) {
  left: 50%;
  -webkit-animation-delay: 8s, 3s;
  animation-delay: 8s, 3s
}

.snowflake:nth-of-type(6) {
  left: 60%;
  -webkit-animation-delay: 6s, 2s;
  animation-delay: 6s, 2s
}

.snowflake:nth-of-type(7) {
  left: 70%;
  -webkit-animation-delay: 2.5s, 1s;
  animation-delay: 2.5s, 1s
}

.snowflake:nth-of-type(8) {
  left: 80%;
  -webkit-animation-delay: 1s, 0s;
  animation-delay: 1s, 0s
}

.snowflake:nth-of-type(9) {
  left: 90%;
  -webkit-animation-delay: 3s, 1.5s;
  animation-delay: 3s, 1.5s
}


/* Demo Purpose Only*/

.demo {
  font-family: 'Raleway', sans-serif;
  color: #fff;
  display: block;
  margin: 0 auto;
  padding: 15px 0;
  text-align: center;
}

.demo a {
  font-family: 'Raleway', sans-serif;
  color: #000;
}

<div id="snowflakes" aria-hidden="true">
  <div>
    ❅
  </div>
  <div>
    ❅
  </div>
  <div>
    ❆
  </div>
  <div>
    ❄
  </div>
  <div>
    ❅
  </div>
  <div>
    ❆
  </div>
  <div>
    ❄
  </div>
  <div>
    ❅
  </div>
  <div>
    ❆
  </div>
  <div>
    ❄
  </div>
</div>

使 Div 出现在圣诞节前后

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