NicoNico Header

// ==UserScript==
// @name         NicoNico Header
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  none
// @author       tacostea
// @match        www.nicovideo.jp/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    Element.prototype.insertHeader = function(href, label){
        var parent = this.parentNode;
        var newElm = document.createElement('a');
        newElm.id = 'siteHeader';
        newElm.class = 'nico-CommonHeaderRoot'
        newElm.setAttribute('href', href);
        newElm.innerText = label;
        parent.insertBefore(newElm, this);
    }

    window.onload = window.setTimeout( function(){
        if(document.querySelector('li.siteHeaderHorizon')){return;}
        var refElm = document.querySelectorAll('a[href*="prem"]')[0];
        refElm.insertHeader('/my/top', 'マイページ');
        refElm.insertHeader('/recommendations', 'オススメ');
        refElm.insertHeader('https://www.upload.nicovideo.jp/garage/upload', '動画投稿');
        refElm.insertHeader('/ranking', 'ランキング');

        var e = document.createElement('style');
        e.innerText = `a#siteHeader{
position: relative;
text-decoration: none;
cursor: pointer;
line-height: 36px;
height: 36px;
display: flex;
-moz-box-align: center;
align-items: center;
font-size: 12px;
width: auto;
padding: 0px 6px;
color: rgb(255, 255, 255);
}
a[href*='/my?']{
display:none!important
}`;
        document.head.appendChild(e);
    }, 500);
})();