如何使用HTML、CSS、JavaScript实现符合预期样式的动态环形进度条

预期效果

当前实现效果

核心问题点 #

• 进度动画和数值逻辑不同步：CSS默认配置的动画是8秒跑满360度对应100%进度，而JS计数器仅到65%就停止，总耗时仅5.2秒，二者完全不匹配
• 进度端点无圆角：目标进度条两端为圆润效果，当前实现未给进度条添加圆角属性
• 未填充区域样式错误：当前未填充进度条是纯白色，和页面背景色差过大，不符合预期样式

修改后完整代码 #

HTML #

<div class="circular">
    <div class="inner"></div>
    <div class="number">100%</div>
    <div class="circle">
        <div class="bar left">
            <div class="progress"></div>
        </div>
        <div class="bar right">
            <div class="progress"></div>
        </div>
    </div>
</div>

CSS #

*{
  margin: 0;
  padding: 0;
  font-family: 'Arial', sans-serif;
}
html, body{
  display:grid;
  height:100%;
  text-align: center;
  place-items: center;
  background: #dde6f0;
}
.circular{
  height:120px;
  width: 120px;
  position: relative;
  transform:scale(2);
}
.circular .inner{
  position: absolute;
  z-index: 6;
  top: 50%;
  left: 50%;
  height: 80px;
  width: 80px;
  margin: -40px 0 0 -40px;
  background: #dde6f0;
  border-radius: 100%;
 
}
.circular .number{
  position: absolute;
  top:50%;
  left:50%;
  transform: translate(-50%, -50%);
  z-index:10;
  font-size:18px;
  font-weight:500;
  color:#4158d0;
}
.circular .bar{
  position: absolute;
  height: 100%;
  width: 100%;
  background: #d0d8e2;
  -webkit-border-radius: 100%;
  clip: rect(0px, 120px, 120px, 70px);
}
.circle .bar .progress{
  position: absolute;
  height: 100%;
  width: 100%;
  -webkit-border-radius: 100%;
  clip: rect(0px, 70px, 120px, 0px);
  background: #FF6600;
  border-radius: 100%;
}
.circle .left .progress{
  z-index:1;
  animation: left 2.6s linear both;
}
@keyframes left{
  100%{
    transform: rotate(180deg);
  }
}
.circle .right {
  transform: rotate(180deg);
  z-index:3;
 
}
.circle .right .progress{
  animation: right 2.6s linear both;
  animation-delay:2.6s;
}
@keyframes right{
  100%{
    transform: rotate(54deg);
  }
}

JavaScript #

const numb = document.querySelector(".number");
let counter = 0;
const timer = setInterval(() => {
  if(counter == 65 ){
    clearInterval(timer);
  }else{
    counter+=1;
    numb.textContent = counter + "%";
  }
}, 80);

修改后进度动画和数值会完全同步，进度端点为圆角，未填充区域为浅灰色，符合预期样式。

内容的提问来源于stack exchange，提问作者Elex Promise