https://bidataydo.com/assets/toc/toc.js?v=wU3kVqmBuG

1function changeToSlug(e=""){return("@"+e.toLowerCase().replace(/á|à|ả|ạ|ã|ă|ắ|ằ|ẳ|ẵ|ặ|â|ấ|ầ|ẩ|ẫ|ậ/gi,"a").replace(/é|è|ẻ|ẽ|ẹ|ê|ế|ề|ể|ễ|ệ/gi,"e").replace(/i|í|ì|ỉ|ĩ|ị/gi,"i").replace(/ó|ò|ỏ|õ|ọ|ô|ố|ồ|ổ|ỗ|ộ|ơ|ớ|ờ|ở|ỡ|ợ/gi,"o").replace(/ú|ù|ủ|ũ|ụ|ư|ứ|ừ|ử|ữ|ự/gi,"u").replace(/ý|ỳ|ỷ|ỹ|ỵ/gi,"y").replace(/đ/gi,"d").replace(/\`|\~|\!|\@|\#|\||\$|\%|\^|\&|\*|\(|\)|\+|\=|\,|\.|\/|\?|\>|\<|\'|\"|\:|\;|_/gi,"").replace(/ /gi,"-").replace(/\-\-\-\-\-/gi,"-").replace(/\-\-\-\-/gi,"-").replace(/\-\-\-/gi,"-").replace(/\-\-/gi,"-")+"@").replace(/\@\-|\-\@|\@/gi,"")}!function(e){"use strict";var t=function(t){return this.each(function(){var n,i,a=e(this),c=a.data(),r=[a],o=this.tagName,l=0;n=e.extend({content:"body",headings:"h1,h2,h3"},{content:c.toc||void 0,headings:c.tocHeadings||void 0},t),i=n.headings.split(","),e(n.content).find(n.headings).attr("id",function(t,n){return n||function(e){0===e.length&&(e="?");for(var t=changeToSlug(e),n="",i=1;null!==document.getElementById(t+n);)n="_"+i++;return t+n}(e(this).text())}).each(function(){var t=e(this),n=e.map(i,function(e,n){return t.is(e)?n:void 0})[0];if(n>l){var a=r[0].children("li:last")[0];a&&r.unshift(e("<"+o+"/>").appendTo(a))}else r.splice(0,Math.min(l-n,Math.max(r.length-1,0)));e("<li/>").appendTo(r[0]).append(e("<a/>").text(t.text()).attr("data-rel","#"+t.attr("id"))),l=n})})},n=e.fn.toc;e.fn.toc=t,e.fn.toc.noConflict=function(){return e.fn.toc=n,this},e(function(){t.call(e("[data-toc]"))})}(window.jQuery);