JavaScript陣列與字串相互轉換 join、split

字串轉陣列

let str = 'string'
let arr = []

arr = str.split() // arr = ['string']  直接轉為陣列[0]專案
arr = str.split('') // arr = ['s','t','r','i','n','g']  直接以單個字元分隔成陣列對應下標項

str = 's-t-r-i-n-g'
arr = str.split('-') // arr = ['s','t','r','i','n','g']  以'-'分隔字串 複製程式碼

陣列轉字串

let arr = [1,2,3,4,5]
let str = ''

str = arr.join('') // str = '1,2,3,4,5' // 預設以逗號隔開
str = arr.join('-') // str = '1-2-3-4-5' // 以'-'隔開 複製程式碼