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介绍
原文链接感謝 comehope 大佬的 [前端每日实战]
效果预览
github.io 浏览
源代码地址
https://github.com/shanyuhai1…
代码解读
1. 首先是完成 html 结构
<figure class=”container”>
<section class=”stars”></section>
<section class=”fires”></section>
</figure>
常规样式初始化
* {
margin: 0;
padding: 0;
}
body {
margin: 0;
padding: 0 0.5vw;
height: 100vh;
background-color: #333;
overflow: hidden;
}
.container {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
2. 天上的星星
原文中星星是固定位置并且不会闪烁的
而这里我们将会改变这一状态, 而且为了避免重复手动给星星固定位置及大小, 所以采用了 d3 库来减少麻烦
<script src=”https://d3js.org/d3.v5.min.js”></script>
首先将 .stars 改为 grid 布局
使用 span 标签 作为星星
因为星星要分时间闪烁所以随机一个 –delay 参数
// index.js
const COLUMNS = 15;
d3.select(‘.stars’)
.style(‘–columns’, COLUMNS)
.selectAll(‘span’)
.data(d3.range(COLUMNS * COLUMNS))
.enter()
.append(‘span’)
.style(‘–delay’, () => Math.random() * 20);
先给出大概的范围, 查看下边界
.stars {
width: 99vw;
height: 70vh;
position: absolute;
display: grid;
grid-template-columns: repeat(var(–columns), 1fr);
border: 1px solid;
}
.stars span {
width: 0.6vw;
height: 0.6vw;
color: whitesmoke;
background-color: currentColor;
}
星星现在只是一个个正方形, 再给正方形添加上旋转闪现的动画即可
.stars span {
transform: scale(0);
animation: spin 20s linear infinite;
animation-delay: calc(var(–delay) * 1s);
}
@keyframes spin {
0% {
transform: rotate(0deg) scale(1);
}
5%,
15% {
transform: rotate(90deg) scale(0);
background: goldenrod;
}
17.5% {
transform: rotate(180deg) scale(1);
background-color: currentColor;
}
20%,
100% {
transform: rotate(90deg) scale(0);
}
}
3. 添加火堆
首先是修改 DOM
<section class=”fires”>
<span class=”fires__flame”></span>
<span class=”fires__flame”></span>
<span class=”fires__flame”></span>
<span class=”fires__flame”></span>
<span class=”fires__stick”></span>
<span class=”fires__stick”></span>
</section>
使火堆居中, 利用媒体查询改变一下在手机端偏小的问题
.fires {
position: relative;
border: 1px solid;
}
@media screen and (min-width: 451px) {
.fires {
width: 15vw;
height: 15vw;
margin-top: -7vw;
}
}
@media screen and (max-width: 450px) {
.fires {
width: 18vh;
height: 18vh;
margin-top: -5vw;
}
}
接着完成火焰效果, 在父级添加可用的 color , border-radius 变量
.fires {
position: relative;
display: flex;
align-items: center;
justify-content: center;
border: 1px solid;
–color-one: #D92B29;
–color-two: #F5732A;
–color-three: #F2B338;
–color-four: #F5D549;
–shape-one: 79% 21% 64% 36% / 43% 61% 39% 57%;
–shape-two: 23% 77% 66% 34% / 57% 72% 28% 43%;
–shape-three: 78% 22% 63% 37% / 39% 27% 73% 61%;
–shape-four: 35% 65% 78% 22% / 54% 50% 50% 46%;
}
@media screen and (min-width: 451px) {
.fires__flame {
width: 6vw;
}
.fires__flame:nth-of-type(1) {
height: 15vw;
}
.fires__flame:nth-of-type(2) {
height: 12vw;
transform: translate(2.25vw, 1.2vw) rotate(30deg);
}
.fires__flame:nth-of-type(3) {
height: 13.5vw;
transform: translate(-2.25vw, 1.2vw) rotate(-30deg);
}
.fires__flame:nth-of-type(4) {
height: 10.5vw;
}
}
@media screen and (max-width: 450px) {
.fires__flame {
width: 7.2vh;
}
.fires__flame:nth-of-type(1) {
height: 18vh;
}
.fires__flame:nth-of-type(2) {
height: 14.4vh;
transform: translate(2.7vh, 1.44vh) rotate(30deg);
}
.fires__flame:nth-of-type(3) {
height: 16.2vh;
transform: translate(-2.7vh, 1.44vh) rotate(-30deg);
}
.fires__flame:nth-of-type(4) {
height: 12.6vh;
}
}
.fires__flame {
position: absolute;
background-color: var(–color-one);
border-radius: var(–shape-one);
z-index: 0;
animation-name: fire;
animation-duration: 1.5s;
animation-iteration-count: infinite;
transition: ease 0.4s;
}
.fires__flame:nth-of-type(2) {
border-radius: var(–shape-two);
background-color: var(–color-two);
opacity: 0.9;
z-index: 2;
animation-delay: 0.2s;
}
.fires__flame:nth-of-type(3) {
border-radius: var(–shape-three);
background-color: var(–color-three);
opacity: 0.8;
z-index: 1;
animation-delay: 0.4s;
}
.fires__flame:nth-of-type(4) {
border-radius: var(–shape-four);
background-color: var(–color-four);
opacity: 0.8;
z-index: 1;
animation-delay: 0.6s;
}
当然别忘了火焰的动画效果
@keyframes fire {
0% {
border-radius: var(–shape-one);
background-color: var(–color-one);
}
25% {
border-radius: var(–shape-two);
background-color: var(–color-two);
}
50% {
border-radius: var(–shape-three);
background-color: var(–color-three);
}
75% {
border-radius: var(–shape-four);
background-color: var(–color-four);
}
100% {
border-radius: var(–shape-one);
background-color: var(–color-one);
}
}
再添加木柴
@media screen and (min-width: 451px) {
.fires__stick {
border-radius: 1.5vw;
width: 3vw;
height: 13.5vw;
bottom: -7.5vw;
}
}
@media screen and (max-width: 450px) {
.fires__stick {
border-radius: 1.8vh;
width: 3.6vh;
height: 16.2vh;
bottom: -9vh;
}
}
.fires__stick {
background-color: #5a3600;
position: absolute;
z-index: 2;
transform:rotate(-70deg);
}
.fires__stick:last-of-type {
transform:rotate(70deg);
background-color: #4e2f01;
}
4. 最后
最后记得把之前确认位置及大小的 border 边框删除即可
