This, Call, Apply, Bind 2017-12-16 Javascript 정리할예정.참고 : http://dailyjs.com/2012/06/18/js101-this/ http://dailyjs.com/2012/06/25/this-binding/ https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind http://anster.tistory.com/165