js滑动进度条效果

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>js滑动进度条效果</title>
    <style>
      *{margin:0;padding:0;user-select:none;}
      .progress-bar{position:relative;height:10px;width:400px;margin:200px auto;background:#ebeef5;border-radius:10px;}
      .progress-bar .pro-bar{position:absolute;left:0;height:10px;width:10px;background:#409eff;}
      .progress-bar .min-num{position:absolute;left:-20px;top:-5px;}
      .progress-bar .max-num{position:absolute;right:-40px;top:-5px;}
      .progress-bar .block {position:absolute;height:30px;width:10px;background:#ccc;top:-10px;border-radius:10px;}
      .progress-bar .block div{position:absolute;display:none;left:-20px;top:-45px;width:50px;height:30px;text-align:center;line-height:30px;background:#ccc;border-radius:20px;}
      .progress-bar .block:hover div{display:block;font-size:10%;color:#fff;background:#409eff;}
    </style>
</head>
<body>
  <div class="progress-bar">
    <span class="min-num">0</span>
    <span class="max-num">100</span>
    <div class="pro-bar"></div>
    <div class="block">
      <div>0</div>
    </div>
  </div>
</body>
<script>
  (function(){
    let moveBlock = document.querySelector('.block');
    let proBar = document.querySelector('.pro-bar');
    let flag = false;
    let startX = null;
    let moveMax = (400 - 10); // 背景条宽度减去滑块的宽度
    moveBlock.onmousedown = function(e){
      startX = e.pageX;
      moveBlock.style.left ? moveBlock.style.left : moveBlock.style.left = '0px';
      let startLeft = parseInt(moveBlock.style.left);
      document.onmousemove = function(e){
        let moveX = (e.pageX - startX) > 0 ? true : false;
        let moveSection = startLeft + (e.pageX - startX);
        // 限定移动范围
        if (moveSection >= 0 && moveSection <= moveMax) {
          let percent = ((startLeft + (e.pageX - startX)) / moveMax).toFixed(4) * 100;
          percent.toString().length > 5 ? percent = percent.toString().subStr(0, 5) : percent = percent.toString();
          moveBlock.style.left = startLeft + (e.pageX - startX) + 'px';
          proBar.style.width = moveBlock.style.left;
          moveBlock.querySelector('div').innerText = percent + '%';
        }
      };
    };
    // 鼠标松开移除事件
    moveBlock.onmouseup = function(){
      document.onmousemove = null;
    };
  })();
</script>
</html>
#麻辣小龙虾#
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js滑动进度条效果

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