纯CSS3实现蜡烛（冒烟）效果
1. 闲来无事时在网上看一些前辈的博客文章，自己尝试了一下。学习到最重要的一点就是box-shadow的叠加使用，受益非线。先上一下效果图：
其中有以下重要的几点：
1. 蜡烛底座的border-radius的水平圆角与垂直圆角设置，即 border-radius：左上水平 右上水平 右下水平 左下水平 / 左上垂直 右上垂直 右下垂直 左下垂直；即border-radius其实是可以设置八个值的。
2. box-shadow的多层叠加（详细可见代码）。
3. 径向渐变的方式(circle、ellipse),详细可见代码。
4. box-shadow的内嵌
5. 烟的径向渐变虚化效果
代码如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> .candle-box{ border: 1px solid #ddd; width: 300px; height: 300px; display: flex; justify-content: center; align-items: center; } .box{ width: 300px; } .box .title{ color: #ccc; text-align: center; } .candle-main{ position: relative; width: 40px; height: 120px; background: #f00; border-radius: 0 0 60px 60px / 0 0 25px 25px; margin-top: 50px; } .candle-tip{ position: relative; top: -17px; } .candle-top{ position: absolute; top: 5px; left: 0; width: 40px; height: 20px; z-index: 10; background: #EF4D65; box-shadow:0 0 10px #f00 inset; border-radius: 60px / 25px; } .candle-top:after{ content: ""; position: absolute; top: -8px; left: calc( 50% - 2px); width: 4px; height: 20px; border-radius: 2px 2px 0 0; background: linear-gradient(to bottom ,#000 0%,#fff 100%); } .candle-fame{ width: 10px; height: 20px; border-radius: 20px / 40px; background: radial-gradient(circle,transparent 20%,#fff 75%); box-shadow: 0 -3px 8px 2px #fff, 0 -8px 15px 5px #ff0, 0 -8px 0 8px #f00; position: relative; z-index: 50; top: -5px; -webkit-animation: flicker 3s linear infinite; -o-animation: flicker 3s linear infinite; animation: flicker 3s linear infinite; } .candle-fame-box{ height: 20px; display: flex; justify-content: center; } .smoke{ position: relative; width: 20px; height: 20px; z-index: 50; top: -7px; display: none; } .smoke span{ display: block; width: 20px; height:20px; opacity: 0; border-radius: 50%; position: absolute; top:0; left: 0; background: radial-gradient(#333, transparent); } .l-smoke1{animation:smokeL linear 10s 1s infinite;} .l-smoke2{animation:smokeL linear 10s 2s infinite;} .l-smoke3{animation:smokeL linear 10s 3s infinite;} .l-smoke4{animation:smokeL linear 10s 4s infinite;} .l-smoke5{animation:smokeL linear 10s 5s infinite;} .l-smoke6{animation:smokeL linear 10s 6s infinite;} .l-smoke7{animation:smokeL linear 10s 7s infinite;} .l-smoke8{animation:smokeL linear 10s 8s infinite;} .l-smoke9{animation:smokeL linear 10s 9s infinite;} .l-smoke10{animation:smokeL linear 10s 10s infinite;} .r-smoke1{animation:smokeR linear 10s 1.5s infinite;} .r-smoke2{animation:smokeR linear 10s 2.5s infinite;} .r-smoke3{animation:smokeR linear 10s 3.5s infinite;} .r-smoke4{animation:smokeR linear 10s 4.5s infinite;} .r-smoke5{animation:smokeR linear 10s 5.5s infinite;} .r-smoke6{animation:smokeR linear 10s 6.5s infinite;} .r-smoke7{animation:smokeR linear 10s 7.5s infinite;} .r-smoke8{animation:smokeR linear 10s 8.5s infinite;} .r-smoke9{animation:smokeR linear 10s 9.5s infinite;} .r-smoke10{animation:smokeR linear 10s 10.5s infinite;} @keyframes flicker{ 0% { transform:scale(1); } 20% { transform:scale(1.1,0.9) rotate(3deg); } 50% { transform:scale(1,1.2); } 80% { transform:scale(0.9,1.1) rotate(-3deg); } 100% { transform:scale(1); } } @keyframes smokeL { 0%{ transform:scale(0.2); } 5%{ transform:scale(0.2) translate(-5px, 0); opacity: 1; } 100%{ transform:scale(1) translate(-5px, -100px); opacity:0; } } @keyframes smokeR { 0%{ transform:scale(0.2); } 5%{ transform:scale(0.2) translate(2px, 0); opacity: 1; } 100%{ transform:scale(1) translate(2px, -100px); opacity:0; } } </style> </head> <body> <div class="box"> <h2 class="title">点击蜡烛点亮或熄灭</h2> <div class="candle-box"> <div class="candle-main" id="candle"> <div class="candle-tip"> <div class="candle-top"></div> <div class="candle-fame-box"> <div class="candle-fame" id="fame"></div> <div class="smoke" id="smoke"> <span class="l-smoke1"></span> <span class="r-smoke1"></span> <span class="l-smoke2"></span> <span class="r-smoke2"></span> <span class="l-smoke3"></span> <span class="r-smoke3"></span> <span class="l-smoke4"></span> <span class="r-smoke4"></span> <span class="l-smoke5"></span> <span class="r-smoke5"></span> <span class="l-smoke6"></span> <span class="r-smoke6"></span> <span class="l-smoke7"></span> <span class="r-smoke7"></span> <span class="l-smoke8"></span> <span class="r-smoke8"></span> <span class="l-smoke9"></span> <span class="r-smoke9"></span> <span class="l-smoke10"></span> <span class="r-smoke10"></span> </div> </div> </div> </div> </div> </div> <script> var candle = document.querySelector("#candle"); var fame = document.querySelector("#fame"); var smoke = document.querySelector("#smoke") var flag = 1; candle.addEventListener("click",function(){ if(flag){ fame.style.display = "none"; smoke.style.display = "block"; flag = 0; }else{ fame.style.display = "block"; smoke.style.display = "none"; flag = 1; } }) </script> </body> </html>
