使用swiper写滑动刻度功能

最近移动端项目中遇到一个滑动刻度功能，找了2个组件，都不能满足需求，想要改动一波，代码太糟糕（都莫得注释），无处下手。。。。越改越糟，就放弃了，自己来写。最后用swiper完成了这个功能。

代码如下：

swiper官网地址：https://www.swiper.com.cn/demo/index.html

scale.html
该demo中我默认生成了100个刻度，如果需要计算每个刻度代表的数值，可以在slideChange事件中通过 mySwiper.activeIndex计算

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/Swiper/4.5.0/css/swiper.min.css">
    <style>
    .swiper-container {
        position: relative;
        width: 100%;
        padding-top: 20px;
        height: 85px;
    }
    .swiper-slide {
        position: relative;
        text-align: center;
        height: 22px;
        /* Center slide text vertically */
        display: -webkit-box;
        display: -ms-flexbox;
        display: -webkit-flex;
        display: flex;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        -webkit-justify-content: center;
        justify-content: center;
        -webkit-box-align: center;
        -ms-flex-align: center;
        -webkit-align-items: center;
        align-items: center;
    }
    .swiper-slide:after {
        position: absolute;
        display: block;
        content: '';
        width: 4px;
        height: 22px;
        right: 50%;
        margin-right: -2px;
        background: #FC552D;
    }
    .point{
      position: absolute;
      border-right: 6px solid transparent;
      border-left: 6px solid transparent;
      border-bottom: 12px solid #FC552D;
      left: 50%; top: 47px;
      margin-left: -6px;
    }
    .point:after {
        position: absolute;
        left: 50%; top: -40px;
        margin-left: -3px;
        display: block;
        content: '';
        width: 6px; height: 35px;
        background: #FC552D;
      }
    .gradient {
        display: block;
        position: absolute;
        top: 0;
        z-index: 99;
        width: 40%;
        height: 85px;
    }
    .gradient.left {
        left: 0;
        background-image: -webkit-linear-gradient(right, rgba(255,255, 255, 0) 0, rgba(255,255, 255, 1) 100%);
    }
    .gradient.right {
        right: 0;
        background-image: -webkit-linear-gradient(left, rgba(255,255, 255, 0) 0, rgba(255,255, 255, 1) 100%);
    }
    </style>
</head>
<body>
    <div class="swiper-container">
        <div class="point"></div>
        <div class="swiper-wrapper"></div>
        <span class="gradient left"></span>
        <span class="gradient right"></span>
    </div>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/Swiper/4.5.0/js/swiper.min.js"></script>
    <script>
    var mySwiper = new Swiper('.swiper-container', {
        slidesPerView: 15, // 设置slider容器能够同时显示的slides数量
        centeredSlides: true, // 设定为true时，active slide会居中，而不是默认状态下的居左
        initialSlide: 99, // 设定初始化时slide的索引。
        virtual: { // 开启虚拟Slide功能，可设置选项或设置为true则使用默认值,
          slides: (function() { // 生成的刻度，100个
            var slides = [];
            for (var i = 0; i < 100; i += 1) {
              slides.push('');
            }
            return slides;
          }()),
        },
        on: {
          slideChange() { // 你的事件
            setTimeout(function() {
              console.log(mySwiper.activeIndex); // mySwiper.activeIndex active slide的索引
            });
          },
        }
    });
    </script>
</body>
</html>