JSFiddle - React, Tailwind, and code Playground

HTML

<div class="t">
  ?p=489&cpage=1#comments <span class="reset">[reset]</span>
</div>

<ul>
  <li class="test">くまくまくま</li>
  <li class="test">ねこねこねこ</li>
  <li class="test">いぬいぬいぬ</li>
  <li class="test">くまくまくま</li>
  <li class="test">ねこねこねこ</li>
  <li class="test">いぬいぬいぬ</li>
</ul>

<ul>
  <li class="test">くまくまくま</li>
  <li class="test">ねこねこねこ</li>
  <li class="test">いぬいぬいぬ</li>
  <li class="test">くまくまくま</li>
  <li class="test">ねこねこねこ</li>
  <li class="test">いぬいぬいぬ</li>
  <li class="test">くまくまくま</li>
  <li class="test">ねこねこねこ</li>
  <li class="test">いぬいぬいぬ</li>
  <li class="test">くまくまくま</li>
  <li class="test">ねこねこねこ</li>
  <li class="test">いぬいぬいぬ</li>
</ul>

CSS

ul {
  counter-reset: olcount 0;
}

ul:last-child {}

ul li {
  list-style: none;
}

ul li::before {
  content: counter(olcount);
  counter-increment: olcount;
  margin-right: 1em;
}

JavaScript

(function($) {
  $(function() {
    var address = $(".t").text();
    //var address = location.search; //本番用
    var cpage = address.match(/cpage=(\d)/)[1];
    //var p = location.search.match(/\?(.*?)&/);

    //cpageが無いか1の時
    if (cpage === null || cpage === "1") {
      //その時のアイテム数を数える
      //便宜上 ul:first
      var licount = $("ul:first").find("li").length;
      //これをwebストレージで覚えておく
      sessionStorage.setItem(address, licount);
//console.log(sessionStorage.getItem(address))
      $("ul:first").css({
        "counter-reset": "olcount 0"
      });

    } else {
      var rAddress = address.replace(/cpage=(\d)/, "cpage=1");
    	var count = sessionStorage.getItem(rAddress);
      console.log(rAddress)
      if (count) {
        $("ul:last-child").css({
          "counter-reset": "olcount " + count
        });
      } else {
        $("ul:first").css({
          "counter-reset": "olcount 0"
        });
      }
    }
    
    $(".t .reset").on("click", function(){
    	sessionStorage.clear();
      var address = $(".t").text();
      var rAddress = address.replace(/cpage=(\d)/, "cpage=1");
      var count = sessionStorage.getItem(rAddress);
      if (!count) {
      	alert("セッションストレージをクリアしました カウント→" + count)
      } 
    });
    
  });
})(jQuery);