2019-06-13 React.js this.refs vs document.getElementById React https://stackoverflow.com/questions/37273876/reactjs-this-refs-vs-document-getelementbyid Netflixはuse no refs, ever, 9:58m https://www.youtube.com/watch?v=kDARP5QZ6nU&list=PLb0IAmt7-GS0M8Q95RIc2lOM6nc77q1IY&index=28