JS 将数字字符串转为 数字数组

将字符串转化为数组主要代码：

let str = '3,4,5,6'
let arr = str.split(",").map(Number);
console.log(arr) //结果：[3,4,5,6]

 

将数字数组转化为字符串数组

let arrs = [1, 2, 3, 4, 5, 6, 7, 8, 9];
let strArr = arrs.map(String); //结果： ['1', '2', '3', '4', '5', '6', '7', '8', '9']
let newStr = strArr.join(',');
console.log(newStr)//结果为：1,2,3,4,5,6,7,8,9