객체불러오기(펼침연산자사용>복사,추가,결합)
{ //객체불러오기(펼침연산자,복사) const ob18 = { a: 100, b: 200, c: "javascript" } const spread = { ...ob18 }; document.write(spread.a, " "); document.write(spread.b, " "); document.write(spread.c, " "); document.write( " "); } { //객체불러오기(펼침연산자,추가) const ob19 = { a: 100, b: 200, c: "javascript" }; const spread = { ...ob19, d: "react" }; document.write(spread.a, " "); document.write(spread.b, " "); document.w..