数组、字符串转换

数组转字符串

join: 将数组元素通过某个字符拼接成字符串，不改变原数组 入参：拼接符

let arr = [1, 2, 3, 4]
let str = arr.join(',')
// str = '1,2,3,4'
// arr = [1, 2, 3, 4]

字符串转数组

split：切割字符串，不会改变原字符串 入参：指定分割符

let nameStr = "lily, jenny, lisa"
let nameArr = nameStr.split(',')
// nameArr = [lily, jenny, lisa]
// nameStr = "lily, jenny, lisa"