一个交互式自定义光标，自动填充圆圈以指示当前滚动位置。

如何使用它:

1.为自定义光标和滚动位置指示器编码HTML。

<div class="cursor" id="cursor"></div>
<div class="cursor2" id="cursor2">          
<div class="progress-wrap">
  <svg class="progress-circle svg-content" width="100%" height="100%" viewBox="-1 -1 102 102">
    <path d="M50,1 a49,49 0 0,1 0,98 a49,49 0 0,1 0,-98"/>
  </svg>
</div>
  </div>
<div class="cursor3" id="cursor3"></div>

2.自定义光标所需的CSS样式。

.cursor,
.cursor2,
.cursor3{
  position: fixed;
  border-radius: 50%; 
  transform: translateX(-50%) translateY(-50%);
  pointer-events: none;
  left: -100px;
  top: 50%;
  -webkit-transition: all 300ms linear;
  transition: all 300ms linear;
}
.cursor{
  background-color: #fff;
  z-index: 99999;
  height: 0;
  width: 0;
}
.cursor2,.cursor3{
  height: 46px;
  width: 46px;
  z-index:99998;
  -webkit-transition:all 0.3s ease-out;
  transition:all 0.3s ease-out
}

.cursor2.hover,
.cursor3.hover{
  -webkit-transform:scale(1.4) translateX(-35%) translateY(-35%);
  transform:scale(1.4) translateX(-35%) translateY(-35%);
  border:none
}

.cursor2.hover{
  background: rgba(255,255,255,0.1);
}

.cursor2.hover .progress-wrap {
  box-shadow: inset  0 0 0 2px rgba(255,255,255,0);
}

.cursor2.hover .progress-wrap svg.progress-circle path {
  opacity: 0.4;
}

3.设置滚动位置指示器的样式。

.progress-wrap {
  height: 46px;
  width: 46px;
  cursor: pointer;
  display: block;
  border-radius: 50px;
  box-shadow: inset  0 0 0 2px rgba(255,255,255,0.2);
  z-index: 10000;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

.progress-wrap svg path { 
  fill: none; 
}

.progress-wrap svg.progress-circle path {
  stroke: var(--grey);
  stroke-width: 4;
  box-sizing: border-box;
  -webkit-transition: all 200ms linear;
  transition: all 200ms linear;
}

4.在文档末尾加载所需的jQuery库。

<script src="/path/to/cdn/jquery.slim.min.js"></script>

5.用于激活自定义光标和滚动位置指示器的主JavaScript。

(function($) { "use strict";

  // Page cursors

    document.getElementsByTagName("body")[0].addEventListener("mousemove", function(n) {
      t.style.left = n.clientX + "px", 
      t.style.top = n.clientY + "px", 
      e.style.left = n.clientX + "px", 
      e.style.top = n.clientY + "px", 
      i.style.left = n.clientX + "px", 
      i.style.top = n.clientY + "px"
    });
    var t = document.getElementById("cursor"),
        e = document.getElementById("cursor2"),
        i = document.getElementById("cursor3");
    function n(t) {
        e.classList.add("hover"), i.classList.add("hover")
    }
    function s(t) {
        e.classList.remove("hover"), i.classList.remove("hover")
    }
    s();
    for (var r = document.querySelectorAll(".hover-target"), a = r.length - 1; a >= 0; a--) {
        o(r[a])
    }
    function o(t) {
        t.addEventListener("mouseover", n), t.addEventListener("mouseout", s)
    }
    
  $(document).ready(function(){"use strict";
  
    //Scroll indicator
    
    var progressPath = document.querySelector('.progress-wrap path');
    var pathLength = progressPath.getTotalLength();
    progressPath.style.transition = progressPath.style.WebkitTransition = 'none';
    progressPath.style.strokeDasharray = pathLength + ' ' + pathLength;
    progressPath.style.strokeDashoffset = pathLength;
    progressPath.getBoundingClientRect();
    progressPath.style.transition = progressPath.style.WebkitTransition = 'stroke-dashoffset 10ms linear';    
    var updateProgress = function () {
      var scroll = $(window).scrollTop();
      var height = $(document).height() - $(window).height();
      var progress = pathLength - (scroll * pathLength / height);
      progressPath.style.strokeDashoffset = progress;
    }
    updateProgress();
    $(window).scroll(updateProgress);
    
  });
  
})(jQuery);

预览截图

滚动进度指示器 自定义光标