如何对进度条进行三角形设计

<div class="progress-bar"></div>

.progress-bar {
  width: 100%;
  height: 20px;
  background-color: #f2f2f2;
}

.progress-bar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-right: 10px solid #ff0000;
  opacity: 0.8;
}

// 使用JavaScript计算进度百分比
var progress = 50; // 进度值，范围为0-100
var progressBar = document.querySelector('.progress-bar');
var triangle = document.querySelector('.progress-bar::before');
var triangleWidth = progress + '%';

// 使用CSS样式修改三角形宽度
triangle.style.width = triangleWidth;

// 或者使用添加CSS类来实现动画效果
progressBar.classList.add('progress-animation');

/* 使用CSS动画实现进度条动画 */
@keyframes progress-animation {
  from {
    width: 0;
  }
  to {
    width: 50%;
  }
}

.progress-animation {
  animation: progress-animation 1s ease-in-out forwards;
}