效果展示

(拖动图片查看效果)

代码实现

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<div class="box">
  <div class="img down"></div>
  <div class="img up"></div>
  <input
    class="progress"
    name="progress"
    type="range"
    min="0"
    max="100"
    value="50" />
</div>
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const progress = document.querySelector('.progress')
const dom = document.querySelector('.up')
progress.addEventListener('input', (e) => {
  let position = e.target.value || 1
  dom.style.width = `${position}%`
})
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.box {
  width: 600px;
  height: 400px;
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.img {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-size: 600px 100%;
}

.down {
  background-image: url(https://wade1999-images-1307558348.cos.ap-shanghai.myqcloud.com/202306251658818.png);
}

.up {
  width: 50%;
  background-image: url(https://wade1999-images-1307558348.cos.ap-shanghai.myqcloud.com/202306251658817.jpg);
}

.progress {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  appearance: none;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0);
  outline: none;
  margin: 0;
  transition: all 0.3s;
}

.progress:hover {
  background: rgba(255, 255, 255, 0.1);
}

.progress::-webkit-slider-thumb {
  appearance: none;
  width: 5px;
  height: 400px;
  background-color: rgba(0, 0, 0, 0);
  cursor: ew-resize;
}