inomata137

## main.js
const s = '甲乙甲乙乙甲'
const a = '甲'
const b = '乙'

console.log(
  s.split(a).map(substr => substr.replaceAll(b, a)).join(b)
)
	const s = '甲乙甲乙乙甲'
	const a = '甲'
	const b = '乙'

	console.log(
	s.split(a).map(substr => substr.replaceAll(b, a)).join(b)
	)