website/public/js/page.js

function getActiveTocElement(e){return[...e].find(e=>e.getBoundingClientRect().y<=0)}function findCorrespondingTocTitle(n){return[...document.querySelectorAll("#toc li a")].find(e=>e.href.substring(e.href.indexOf("#"))==="#"+n.id)}document.addEventListener("DOMContentLoaded",function(){if(null!==document.getElementById("toc")){var e=document.querySelectorAll("#toc li a");let n=[];[...e].forEach(e=>{n.push(e.href.substring(e.href.indexOf("#")))});const i=document.querySelectorAll(n.join(","));let t=[...i].reverse();e=getActiveTocElement(t)||i[0];findCorrespondingTocTitle(e).classList.add("bg-blue-700");var o=e;window.addEventListener("scroll",()=>{var e=getActiveTocElement(t)||i[0];e!==o&&(findCorrespondingTocTitle(o).classList.remove("bg-blue-700"),findCorrespondingTocTitle(e).classList.add("bg-blue-700"),o=e)})}});