SVG怎样开始实现多彩圆环倒计时

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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