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 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; } 

 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();