javascript '' , "" 차이javascript single quote double quote https://www.w3schools.com/js/js_strings.asphttps://bytearcher.com/articles/single-or-double-quotes-strings-javascript/ escape 문자로 쓰이는것 같다.... 잘 모르겠음..... alert('Say Hello'); // Say Hello alert("Say Hello"); // Say Hello alert('Say "Hello"'); // Say "Hello" alert("Say 'Hello'"); // Say 'Hello'