主要思路：在一个容器中用display:flex + justify-content:space-between将几个块级元素水平均匀分布并且第一个元素和最后一个元素靠边,然后设置progress进度条和伪元素进度条样式一下且置于块级进度显示元素下方，用js实现点击按钮控制进度条长度变化

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>progress steps</title>

  <link rel="stylesheet" href="./style.css">

</head>
<body>
  <div class="container">
    <div class="progress-container">
      <div id="progress"></div>
      <div class="circle active">1</div>
      <div class="circle">2</div>
      <div class="circle">3</div>
      <div class="circle">4</div>
    </div>

    <button class="btn" id="pre">Prev</button>
    <button class="btn" id="next">Next</button>
  </div>

  <script src="./script.js"></script>
</body>
</html>



:root {
  --line-border-fill: #3498db;
  --line-border-empty: #e0e0e0;
}

*{
  box-sizing: border-box;
}


body{
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}

.container{
  text-align: center;
}

.progress-container{
  display: flex;
  justify-content: space-between;
  position: relative;
  margin-bottom: 30px;
  width: 350px;
}

.progress-container::before{
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  width: 100%;
  height: 4px;
  background-color: var(--line-border-empty);
  z-index: -1;
}

#progress{
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  width: 0%;
  height: 4px;
  background-color: var(--line-border-fill);
  transition: all 0.4s ease;
  z-index: -1;
}

.circle{
  background-color: #fff;
  color: #999;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--line-border-empty);
  transition: all 0.4s ease;
}

.circle.active{
  border-color: var(--line-border-fill);
}

.btn{
  background-color: var(--line-border-fill);
  color: #fff;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  padding: 8px 30px;
  margin: 5px;
  font-size: 14px;
}

.btn:active{
  transform: scale(0.98);
}

.btn:focus{
  outline: 0;
}

.btn:disabled{
  background-color: var(--line-border-empty);
  cursor: not-allowed;
}

const progress = document.querySelector('#progress')
const circleList = document.querySelectorAll('.circle')
const pre = document.querySelector('#pre')
const next = document.querySelector('#next')


let activeCount = 1

next.addEventListener('click', () => {
  activeCount++

  if (activeCount > circleList.length) {
    activeCount = circleList.length
  }

  update()
})

pre.addEventListener('click', () => {
  activeCount--

  if (activeCount < 1) {
    activeCount = 1
  }

  update()
})


function update () {
  circleList.forEach((circle, index) => {
    if (index < activeCount) {
      circle.classList.add('active')
    } else{
      circle.classList.remove('active')
    }
  })

  progress.style.width = (activeCount - 1) / (circleList.length - 1) * 100 + '%'

  if (activeCount === 1) {
    pre.disabled = true
  } else if (activeCount === circleList.length) {
    next.disabled = true
  } else {
    pre.disabled = false
    next.disabled = false
  }
}

效果展示

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Q.E.D.

一个二次元web开发咸鱼