#author("2018-01-05T00:10:02+00:00","default:admin","admin") -[[JavaScriptの「this」は「4種類」??:https://qiita.com/takeharu/items/9935ce476a17d6258e27]] -[[JavaScript の this を理解する多分一番分かりやすい説明:https://qiita.com/takkyun/items/c6e2f2cf25327299cf03]] -[[JavaScript の this を理解する:http://tacamy.hatenablog.com/entry/2013/01/06/224718]]