这次给大家带来SVG怎样开始实现多彩圆环倒计时，怎样用SVG实现多彩圆环倒计时？SVG实现多彩圆环倒计时的注意事项有哪些，下面就是实战案例，一起来看一下。
圆环倒计时我们经常见到，实现的方法也有很多种。但是本文将介绍一种全新的实现方式，使用SVG来实现倒计时功能。
SVG倒计时案例
下面说说相关的实现代码。css实现代码如下：
svg { transform: rotate(-0.05deg);}circle { transition: stroke-dasharray .2s;}.time-count-x { line-height: 1.5; position: relative;}.time-second { position: absolute; top: 50%; left: 0; right: 0; margin-top: -.75em; text-align: center; font-size: 100px;}相关html代码如下：
<div id="timeCountX" class="time-count-x"> <svg width="440" height="440" viewBox="0 0 440 440" class="center"> <defs> <linearGradient x1="1" y1="0" x2="0" y2="0" id="gradient1"> <stop offset="0%" stop-color="#e52c5c"></stop> <stop offset="100%" stop-color="#ab5aea"></stop> </linearGradient> <linearGradient x1="1" y1="0" x2="0" y2="0" id="gradient2"> <stop offset="0%" stop-color="#4352f3"></stop> <stop offset="100%" stop-color="#ab5aea"></stop> </linearGradient> </defs> <g transform="matrix(0,-1,1,0,0,440)"> <circle cx="220" cy="220" r="170" stroke-width="50" stroke="#f0f1f5" fill="none" stroke-dasharray="1069 1069"></circle> <circle cx="220" cy="220" r="170" stroke-width="50" stroke="url('#gradient1')" fill="none" stroke-dasharray="1069 1069"></circle> <circle cx="220" cy="220" r="170" stroke-width="50" stroke="url('#gradient2')" fill="none" stroke-dasharray="534.5 1069"></circle> </g> </svg> <span id="timeSecond" class="time-second"></span></div>最后是相关JavaScript代码：
var eleCircles=document.querySelectorAll("#timeCountX circle");var eleTimeSec=document.getElementById("timeSecond");var perimeter=Math.PI*2*170;var circleInit=function(){ if(eleCircles[1]){ eleCircles[1].setAttribute("stroke-dasharray","1069 1069") } if(eleCircles[2]){ eleCircles[2].setAttribute("stroke-dasharray",perimeter/2+" 1069") } eleTimeSec.innerHTML=""};var timerTimeCount=null;var fnTimeCount=function(b){ if(timerTimeCount){ return } var b=b||10; var a=function(){ var c=b/10; if(eleCircles[1]){ eleCircles[1].setAttribute("stroke-dasharray",perimeter*c+" 1069") } if(eleCircles[2]&&b<=5){ eleCircles[2].setAttribute("stroke-dasharray",perimeter*c+" 1069") } if(eleTimeSec){ eleTimeSec.innerHTML=b } b--; if(b<0){ clearInterval(timerTimeCount); timerTimeCount=null; alert("时间到！"); circleInit() } }; a(); timerTimeCount=setInterval(a,1000)};fnTimeCount();相信看了这些案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！
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