字符串转数组 数组转字符串

1、字符串=>数组

const str='abc'
console.log(str.split(''))    //['a', 'b', 'c']
console.log(Array.from(str))  //['a', 'b', 'c']
console.log([...str])         //['a', 'b', 'c']

2、数组=>字符串

const arr=[1,2,3]
console.log(arr.toString())       //1,2,3
console.log(arr.toLocaleString()) //1,2,3
console.log(arr.join(','))        //1,2,3