CSS随机动画的问题

cqwcns · 发表于 2023-1-1 19:40

这里有个简约但好看的CSS动画背景。
Pure Css Animated Background (codepen.io)
效果是一个个多边形上浮。

但多边形的尺寸、位置（Left）和延时等属性，都是写死了的。

我希望将多边形的各项属性随机，且每次动画迭代都不一样，即不是循环播放上一次的设定。

我尝试这样写，但可见肯定是不行的，请各位大佬指教。感谢。

[HTML] 纯文本查看 复制代码

<template>
  <div>
    <div class="area">
      <ul class="circles">
        <li v-for="i in 10" :style="objElementStyle"></li>
      </ul>
    </div>

    <div class="context">
      <h1>Pure Css Animated Background</h1>
    </div>

  </div>
</template>

<script setup>
import { reactive } from 'vue'

const objElementStyle = reactive({
  left: Math.random() * 100 + '%',
  width: Math.random() * 100 + 'px',
  height: Math.random() * 100 + 'px',
  'animation-delay': '0s',
  'animation-duration': '11s'
})

</script>
  
<style>
* {
  margin: 0px;
  padding: 0px;
}

body {
  font-family: 'Exo', sans-serif;
}

.area {
  background: #4e54c8;
  background: -webkit-linear-gradient(to left, #8f94fb, #4e54c8);
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}

.circles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.circles li {
  position: absolute;
  display: block;
  list-style: none;
  width: 20px;
  height: 20px;
  background: rgba(255, 255, 255, 0.2);
  animation: animate 25s linear infinite;
  bottom: -150px;
}

@keyframes animate {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
    border-radius: 0;
  }

  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
    border-radius: 50%;
  }
}
</style>

jiujiukeji · 发表于 2023-1-1 21:05

这个不好搞 css动画进入页面的时候参数就设定好了不刷新参数是不会发生改变的你就算给他随机了他也不会去读取新的参数

jiujiukeji · 发表于 2023-1-1 21:07

本帖最后由 jiujiukeji 于 2023-1-1 21:11 编辑

[CSS] 纯文本查看 复制代码

:root {
            --ch1: 300px;
#这里需要你自己多定义几个变量~
        }
.circles li:nth-child(1){
    left: 25%;
    width: var(--ch1);
    height: var(--ch1);
    animation-delay: 0s;
}

[JavaScript] 纯文本查看 复制代码

setInterval(function () { 
   var r=randomNum(20,300);
   console.log(r)
   
   changePx(r);
                         }, 2000);
function changePx(r) {
        document.documentElement.style.setProperty('ch1',r+"px" );
}

//生成从minNum到maxNum的随机数
function randomNum(minNum,maxNum){ 
    switch(arguments.length){ 
        case 1: 
            return parseInt(Math.random()*minNum+1,10); 
        break; 
        case 2: 
            return parseInt(Math.random()*(maxNum-minNum+1)+minNum,10); 
        break; 
            default: 
                return 0; 
            break; 
    } 
}

能达到随机的效果但是怎么写入参数就得你去想办法了~~

npc404 · 发表于 2023-1-1 22:10

[HTML] 纯文本查看 复制代码

<template>
  <div>
    <div class="area">
      <ul class="circles" @animationend="fn">
        <li
          v-for="(i, index) in elements"
          :key="index"
          :style="[styleList[index], animateName]"
        ></li>
      </ul>
    </div>

    <div class="context">
      <h1>Pure Css Animated Background</h1>
    </div>
  </div>
</template>

<script setup>
import { reactive, ref } from "vue";
const elements = reactive(Array.from({ length: 10 }));
const styleList = reactive([]);
const animateName = reactive({
  "--animation": "animate",
});

const createStyle = () => {
  return {
    left: Math.random() * 100 + "%",
    width: Math.random() * 100 + "px",
    height: Math.random() * 100 + "px",
    "animation-delay": "0s",
    "animation-duration": "11s",
  };
};

const setStyle = () => {
  for (let i = 0; i < elements.length; i++) {
    styleList[i] = createStyle();
  }
};
setStyle();

const toggleAnimation = () => {
  if (animateName["--animation"] === "animate") {
    animateName["--animation"] = "animate1";
  } else {
    animateName["--animation"] = "animate";
  }
};

const count = ref(0);
const fn = () => {
  count.value++;
  if (count.value === elements.length) {
    count.value = 0;
    setStyle();
    toggleAnimation();
  }
};
</script>

<style>
.area {
  background: #4e54c8;
  background: -webkit-linear-gradient(to left, #8f94fb, #4e54c8);
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}

.circles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.circles li {
  --animation: animate;
  position: absolute;
  display: block;
  list-style: none;
  width: 20px;
  height: 20px;
  background: rgba(255, 255, 255, 0.2);
  animation: var(--animation) 25s linear;
  bottom: -150px;
}

@keyframes animate {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
    border-radius: 0;
  }

  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
    border-radius: 50%;
  }
}
@keyframes animate1 {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
    border-radius: 0;
  }

  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
    border-radius: 50%;
  }
}
</style>

jiujiukeji · 发表于 2023-1-1 22:16

本帖最后由 jiujiukeji 于 2023-1-1 22:19 编辑

[HTML] 纯文本查看 复制代码

   <div class="context">
        <h1>Pure Css Animated Background</h1>
    </div>


<div class="area" >
            <ul class="circles">
                    <li id="circles_1">1</li>
                    <li id="circles_2">2</li>
                    <li id="circles_3">3</li>
                    <li id="circles_4">4</li>
                    <li id="circles_5">5</li>
                    <li id="circles_6">6</li>
                    <li id="circles_7">7</li>
                    <li id="circles_8">8</li>
                    <li id="circles_9">9</li>
                    <li id="circles_10">10</li>
            </ul>
    </div >

[CSS] 纯文本查看 复制代码

[url=home.php?mod=space&uid=476974]@import[/url] url('https://fonts.googleapis.com/css?family=Exo:400,700');

*{
    margin: 0px;
    padding: 0px;
}

body{
    font-family: 'Exo', sans-serif;
}


.context {
    width: 100%;
    position: absolute;
    top:50vh;
    
}

.context h1{
    text-align: center;
    color: #fff;
    font-size: var(--ch1);
}


.area{
    background: #4e54c8;  
    background: -webkit-linear-gradient(to left, #8f94fb, #4e54c8);  
    width: 100%;
    height:100vh;
    
   
}

.circles{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.circles li{
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 25s linear infinite;
    bottom: -150px;
    
}

 :root {
            --ch1: 80px;
            --ch2: 20px;
            --ch3: 20px;
            --ch4: 60px;
            --ch5: 20px;
            --ch6: 110px;
            --ch7: 150px;
            --ch8: 25px;
            --ch9: 15px;
            --ch10: 150px;
        }
#circles_1{
    left: 25%;
    width: var(--ch1);
    height: var(--ch1);
    animation-delay: 0s;
}


#circles_2{
    left: 10%;
    width:  var(--ch2);
    height:  var(--ch2);
    animation-delay: 2s;
    animation-duration: 12s;
}

#circles_3{
    left: 70%;
    width:  var(--ch3);
    height:  var(--ch3);
    animation-delay: 4s;
   animation-duration: 8s;
}

#circles_4{
    left: 40%;
    width:  var(--ch4);
    height:  var(--ch4);
    animation-delay: 0s;
    animation-duration: 18s;
}

#circles_5{
    left: 65%;
    width:  var(--ch5);
    height:  var(--ch5);
    animation-delay: 0s;
    animation-duration: 10s;
}
#circles_6{
    left: 75%;
    width:  var(--ch6);
    height:  var(--ch6);
    animation-delay: 3s;
   animation-duration: 12s;
}

#circles_7{
    left: 35%;
    width:  var(--ch7);
    height:  var(--ch7);
    animation-delay: 7s;
   animation-duration: 15s;
}

#circles_8{
    left: 50%;
    width:  var(--ch8);
    height:  var(--ch8);
    animation-delay: 15s;
    animation-duration: 45s;
}

#circles_9{
    left: 20%;
    width:  var(--ch9);
    height:  var(--ch9);
    animation-delay: 2s;
    animation-duration: 35s;
}

#circles_10{
    left: 85%;
    width:  var(--ch10);
    height:  var(--ch10);
    animation-delay: 0s;
    animation-duration: 11s;
}



@keyframes animate {

    0%{
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }

    100%{
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }

}

[JavaScript] 纯文本查看 复制代码

/*
Background Gradients From -- 
[url=https://uigradients.com]https://uigradients.com[/url]
*/
//5s
setInterval(function () { 
   var r2=randomNum(20,80);
   changeCh2(r2);
}, 14000);
//8s
setInterval(function () { 
   var r3=randomNum(20,80);
   changeCh3(r3);
}, 12000);

//18s
setInterval(function () { 
   var r4=randomNum(60,120);
   changeCh4(r4);
}, 18000);

//10s
setInterval(function () { 
   var r5=randomNum(20,80);
   changeCh5(r5);
}, 10000);
//15s
setInterval(function () { 
   var r6=randomNum(110,170);
   changeCh6(r6);
}, 15000);
//19s
setInterval(function () { 
   var r7=randomNum(150,210);
   changeCh7(r7);
}, 22000);
//60s
setInterval(function () { 
   var r8=randomNum(25,80);
   changeCh8(r8);
}, 60000);
//37s
setInterval(function () { 
   var r9=randomNum(15,75);
   changeCh9(r9);
}, 37000);
//11s
setInterval(function () { 
   var r10=randomNum(150,210);
   changeCh10(r10);
}, 11000);
//circles_2
function changeCh2(r) {
   document.getElementById("//circles_2").style.width=r+"px";
   document.getElementById("circles_2").style.height=r+"px";
}
//circles_3
function changeCh3(r) {
   document.getElementById("circles_3").style.width=r+"px";
   document.getElementById("circles_3").style.height=r+"px";
}
//circles_4
function changeCh4(r) {
   document.getElementById("circles_4").style.width=r+"px";
   document.getElementById("circles_4").style.height=r+"px";
}
//circles_5
function changeCh5(r) {
   document.getElementById("circles_5").style.width=r+"px";
   document.getElementById("circles_5").style.height=r+"px";
}
//circles_6
function changeCh6(r) {
   document.getElementById("circles_6").style.width=r+"px";
   document.getElementById("circles_6").style.height=r+"px";
}
//circles_7
function changeCh7(r) {
   document.getElementById("circles_7").style.width=r+"px";
   document.getElementById("circles_7").style.height=r+"px";
}
//circles_8
function changeCh8(r) {
   document.getElementById("circles_8").style.width=r+"px";
   document.getElementById("circles_8").style.height=r+"px";
}
//circles_9
function changeCh9(r) {
   document.getElementById("circles_9").style.width=r+"px";
   document.getElementById("circles_9").style.height=r+"px";
}
//circles_10
function changeCh10(r) {
   document.getElementById("circles_10").style.width=r+"px";
   document.getElementById("circles_10").style.height=r+"px";
}


//生成从minNum到maxNum的随机数
function randomNum(minNum,maxNum){ 
    switch(arguments.length){ 
        case 1: 
            return parseInt(Math.random()*minNum+1,10); 
        break; 
        case 2: 
            return parseInt(Math.random()*(maxNum-minNum+1)+minNum,10); 
        break; 
            default: 
                return 0; 
            break; 
    } 
}

用笨办法给你实现了你自己修改修改~~

jiujiukeji · 发表于 2023-1-1 22:24

如果你们用的VUE框架 ~~~ 我就啥也不说了~

三滑稽甲苯 · 发表于 2023-1-2 08:52

感觉要通过js配合才能实现

笨笨家的唯一 · 发表于 2023-1-2 22:45

肯定要用JS啊，因为你要求每次都不一样，可以参考一下5楼的代码，就设置定时器，用js读取属性直接修改

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[求助] CSS随机动画的问题

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