JSFiddle - React, Tailwind, and code Playground

JavaScript

/*
 * Please scroll till you see
 * the function called addNextPage(oj)
 */

var tumblrAutoPager = {
    url: "http://proto.jp/",
    ver: "0.1.7",
    rF: true,
    gP: {},
    pp: null,
    ppId: "",
    LN: location.hostname,
    init: function () {
        if ($("autopagerize_icon") || navigator.userAgent.indexOf('iPhone') != -1) return;
        var tAP = tumblrAutoPager;
        var p = 1;
        var lh = location.href;
        var lhp = lh.lastIndexOf("/page/");
        var lht = lh.lastIndexOf("/tagged/");
        if (lhp != -1) {
            p = parseInt(lh.slice(lhp + 6));
            tAP.LN = lh.slice(7, lhp);
        } else if (lht != -1) {
            tAP.LN = lh.slice(7);
            if (tAP.LN.slice(tAP.LN.length - 1) == "/") tAP.LN = tAP.LN.slice(0, tAP.LN.length - 1);
        } else if ("http://" + tAP.LN + "/" != lh) {
            return;
        };
        var gPFncs = [];
        gPFncs[0] = function (aE) {
            var r = [];
            for (var i = 0, l = aE.length; i < l; i++) {
                if (aE[i].className == "autopagerize_page_element") {
                    r = gCE(aE[i]);
                    break;
                }
            }
            return r;
        };
        gPFncs[1] = function (aE) {
            var r = [];
            for (var i = 0, l = aE.length; i < l; i++) {
                var arr = aE[i].className ? aE[i].className.split(" ") : null;
                if (arr) {
                    for (var j = 0; j < arr.length; j++) {
                        arr[j] == "post" ? r.push(aE[i]) : null;
                    }
                }
            }
            return r;
        };
        gPFncs[2] = function (aE) {
            var r = [];
            var tmpId = tAP.ppId ? [tAP.ppId] : ["posts", "main", "container", "content", "apDiv2", "wrapper", "projects"];
            for (var i = 0, l = aE.length; i < l; i++) {
                for (var j = 0; j < tmpId.length; j++) {
                    if (aE[i].id == tmpId[j])...