// 数组转字符串,用逗号间隔

let list=['aaa']

console.log(list.join(','))

list=['aaa','bbb','ccc']

console.log(list.join(','))

// 字符串转数组,用逗号间隔

let str='aaa'

console.log(str.split(','))

str='aaa,bbb,ccc'

console.log(str.split(','))

输出:

aaa

aaa,bbb,ccc

["aaa"]

["aaa", "bbb", "ccc"]