CSS3圆形进度条动画特效

这是一款简单的CSS3圆形进度条动画特效。该圆形进度条特效采用bootstrap网格系统进行布局，并通过CSS3代码来完成圆形进度条的动画效果。

使用方法

在页面中引入bootstrap.min.css文件。

<link rel="stylesheet" href="path/to/bootstrap.min.css">
                

HTML结构

圆形进度条的基本HTML结构如下：

<div class="container">
      <div class="row">
          <div class="col-md-3 col-sm-6">
            <!--  一个蓝色的圆形进度条，进度从0动画到90% -->
              <div class="progress blue">
                  <span class="progress-left">
                      <span class="progress-bar"></span>
                  </span>
                  <span class="progress-right">
                      <span class="progress-bar"></span>
                  </span>
                  <div class="progress-value">90%</div>
              </div>
          </div>
  </div>
</div>
                

CSS代码

圆形进度条的基本样式如下：

.progress{
    width: 150px;
    height: 150px;
    line-height: 150px;
    background: none;
    margin: 0 auto;
    box-shadow: none;
    position: relative;
}
.progress:after{
    content: "";
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid #fff;
    position: absolute;
    top: 0;
    left: 0;
}
.progress > span{
    width: 50%;
    height: 100%;
    overflow: hidden;
    position: absolute;
    top: 0;
    z-index: 1;
}
.progress .progress-left{
    left: 0;
}
.progress .progress-bar{
    width: 100%;
    height: 100%;
    background: none;
    border-width: 2px;
    border-style: solid;
    position: absolute;
    top: 0;
}
.progress .progress-left .progress-bar{
    left: 100%;
    border-top-right-radius: 80px;
    border-bottom-right-radius: 80px;
    border-left: 0;
    -webkit-transform-origin: center left;
    transform-origin: center left;
}
.progress .progress-right{
    right: 0;
}
.progress .progress-right .progress-bar{
    left: -100%;
    border-top-left-radius: 80px;
    border-bottom-left-radius: 80px;
    border-right: 0;
    -webkit-transform-origin: center right;
    transform-origin: center right;
    animation: loading-1 1.8s linear forwards;
}
.progress .progress-value{
    width: 85%;
    height: 85%;
    border-radius: 50%;
    border: 2px solid #ebebeb;
    font-size: 32px;
    line-height: 125px;
    text-align: center;
    position: absolute;
    top: 7.5%;
    left: 7.5%;
}
                

内置有4种颜色的圆形进度条。

.progress.blue .progress-bar{
    border-color: #049dff;
}
.progress.blue .progress-value{
    color: #049dff;
}
.progress.yellow .progress-bar{
    border-color: #fdba04;
}
.progress.yellow .progress-value{
    color: #fdba04;
}
.progress.pink .progress-bar{
    border-color: #ed687c;
}
.progress.pink .progress-value{
    color: #ed687c;
}
.progress.green .progress-bar{
    border-color: #1abc9c;
}
.progress.green .progress-value{
    color: #1abc9c;
}                  
                

所有的圆形进度条都执行loading-*的CSS3 animation动画。

.progress.blue .progress-left .progress-bar{
    animation: loading-2 1.5s linear forwards 1.8s;
}
.progress.yellow .progress-left .progress-bar{
    animation: loading-3 1s linear forwards 1.8s;
}
.progress.pink .progress-left .progress-bar{
    animation: loading-4 0.4s linear forwards 1.8s;
}
.progress.green .progress-left .progress-bar{
    animation: loading-5 1.2s linear forwards 1.8s;
}
@keyframes loading-1{
0%{
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
}
100%{
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
}
}
@keyframes loading-2{
0%{
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
}
100%{
    -webkit-transform: rotate(144deg);
    transform: rotate(144deg);
}
}
@keyframes loading-3{
0%{
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
}
100%{
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
}
}
@keyframes loading-4{
0%{
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
}
100%{
    -webkit-transform: rotate(36deg);
    transform: rotate(36deg);
}
}
@keyframes loading-5{
0%{
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
}
100%{
    -webkit-transform: rotate(126deg);
    transform: rotate(126deg);
}
}
@media only screen and (max-width: 990px){
.progress{ margin-bottom: 20px; }
}