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样式图：

• css

/*底部导航在手机端是否开启*/
@media (max-width: 800px){.footwaveline{display: none;}}
/*底部导航*/

• 自定义javascript代码

<!--底部导航滚动进度条百分比-->
$(function(){var $this=$("#footgundong");var scrollTimer;$this.hover(function(){clearInterval(scrollTimer)},function(){scrollTimer=setInterval(function(){scrollNews($this)},2000)}).trigger("mouseleave");function scrollNews(obj){var $self=obj.find("ul");var lineHeight=$self.find("li:first").height();$self.animate({"marginTop":-lineHeight+"px"},500,function(){$self.css({marginTop:0}).find("li:first").appendTo($self)})}})
window.onscroll = function() {
  let scrollNow = window.pageYOffset;
  let pageClientHeight = document.documentElement.clientHeight;
  let scrollHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight, document.body.offsetHeight, document.documentElement.offsetHeight, document.body.clientHeight, document.documentElement.clientHeight) - pageClientHeight;
  let fullWindowHeightInPercentage = Math.round((scrollNow / scrollHeight) * 100);
  let percentage = document.getElementById('percentage');
  percentage.innerHTML = '<svg class="icon" aria-hidden="true"><use xlink:href="#icon-dingwei"></use></svg> ' + fullWindowHeightInPercentage + '%';
  if (fullWindowHeightInPercentage == 0) percentage.innerHTML = '<svg class="icon" aria-hidden="true"><use xlink:href="#icon-dingwei"></use></svg> 到顶啦';
  if (fullWindowHeightInPercentage == 100) percentage.innerHTML = '<svg class="icon" aria-hidden="true"><use xlink:href="#icon-jiasu1"></use></svg> 到底啦';
}
<!--底部导航滚动进度条百分比-->

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• 图标

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<style type="text/css">.icon {width: 1em; height: 1em;vertical-align: -0.15em;fill: currentColor;overflow: hidden;}</style>