timer/timer.html at master · wjeek/timer · GitHub

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<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>SVG与多彩渐变圆环倒计时效果</title>
  <style type="text/css">
    svg {
      transform: rotate(-0.05deg);
    }
    circle {
      transition: stroke-dasharray .2s;
    }
    .time-count-x {
      line-height: 1.5;
      width: 440px;
      position: relative;
    }
    .time-second {
      position: absolute;
      top: 50%; left: 0; right: 0;
      margin-top: -.75em;
      text-align: center;
      font-size: 100px;
    }
  </style>
</head>
<body>
<div id="main">
  <div id="body">
    <div id="effect" class="part" style="width:45%;">
      <h3>效果：</h3>
      <div class="show">
        <div class="demo">
          <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-linecap="round" stroke-dasharray="1069 1069"></circle>
                <circle cx="220" cy="220" r="170" stroke-width="50" stroke="url('#gradient1')" stroke-linecap="round" fill="none" stroke-dasharray="1069 1069"></circle>
                <circle cx="220" cy="220" r="170" stroke-width="50" stroke="url('#gradient2')" stroke-linecap="round" fill="none" stroke-dasharray="534.5 1069"></circle>
              </g>
            </svg>
            <span id="timeSecond" class="time-second"></span>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
<script>
  const eleCircles=document.querySelectorAll("#timeCountX circle")
  const econstimeSec=document.getElementById("timeSecond")
  const perimeter=Math.PI*2*170
  const circleInit=function(){
    if(eleCircles[1]){
      eleCircles[1].setAttribute("stroke-dasharray","1069 1069")
    }
    if(eleCircles[2]){
      eleCircles[2].setAttribute("stroke-dasharray",perimeter/2+" 1069")
    }
    econstimeSec.innerHTML=""
  }
  let timerTimeCount=null
  const fnTimeCount=function(time){
    if(timerTimeCount){
      return
    }
    let b=time||10
    const a=function(){
      const c=b/15
      if(eleCircles[1]){
        eleCircles[1].setAttribute("stroke-dasharray",perimeter*c+" 1069")
      }
      if(eleCircles[2]&&b<=8){
        eleCircles[2].setAttribute("stroke-dasharray",perimeter*c+" 1069")
      }
      if(econstimeSec){
        econstimeSec.innerHTML=b
      }
      b--
      if(b<0){
        clearInterval(timerTimeCount)
        timerTimeCount=null
        alert("时间到！")
        circleInit()
      }
    }
    a()
    timerTimeCount=setInterval(a,1000)
  }
  fnTimeCount(15)
</script>
</body>
</html>