1、字符串转数组
var name = 'zhangsan'
var nameList = name.split('')
console.log('one',nameList) //["z", "h", "a", "n", "g", "s", "a", "n"]
var name2 = 'li si'
var nameList2 = name2.split(' ')
console.log('two',nameList2) //["li", "si"]
2、数组转字符串
var arr = [1,2,3,4,5]
var arr1 = arr.join('')
console.log(arr1) //12345
var arr3 = [1,2,3,4,5]
var arr4 = arr.join('-')
console.log(arr4) //1-2-3-4-5