CONTENTS JavaScript10.객체4)내장객체(String)5)내장객체(Date)6)내장객체(Math)7)내장객체(Number)8)내장객체(RegExp) --------------------------------------------------------- JavaScript 10.객체 4)내장객체(String) String메서드 script> let str01 = "this is JavaScript"; document.write("1. 인덱스가 1인 문자는: " + str01.charAt(1) + ""); document.write("2. 결합된 문자열: " + str01.concat('World...') + ""); document.write("3. 검색된 'Ja'인덱..