Userscript for NICONICO(GINZA): add download link and axel download command generator after video title

smiledown.user.js

// ==UserScript==
// @name                Smile Download
// @namespace           https://kirisetsz.github.io/
// @version             0.1.1
// @description         Download video from Niconico (GINZA)
// @match               http://www.nicovideo.jp/watch/*
// @copyright           2014, kirisetsz
// ==/UserScript==

var smile = function () {
  var title = document.getElementsByClassName("videoHeaderTitle")[0];
  var name = title.innerHTML;
  var id = location.href.replace(/http.*?watch\/([^?]*)(\?.*)?$/g,"$1");
  $.getJSON("http://www.nicovideo.jp/watch/" + id + "?mode=normal&playlist_token=" + require("WatchApp").ns('init').WatchInitializer.watchAPILoader.playlistToken, 
    function (json) { 
      var flv = unescape(/url\=(.*?)\&/.exec(decodeURIComponent(json.flashvars.flvInfo))[1]);
      title.innerHTML = name + '<a href="' + flv + '" download="' + name + '.mp4">ヽ(•̀ω•́ )ゝ</a><a id="dcmd" href="#">✧</a>';
      document.getElementById('dcmd').addEventListener('click', function (e) {
          window.prompt('Download Command', 'axel -a -n3 -H \'Cookie: ' + document.cookie + '\' -o \'' + name + '.mp4\' ' + flv + '\n');
          return e.preventDefault();
      });
    });
};

window.addEventListener('load', smile, false);