将JS数组转成Number类型或者String类型
1.将string数组转成number数组
// 字符数组转数字数组
let strArr = ["2", "3", "1", "1"]
let numArr = strArr.map(Number)
console.log(numArr)
2.将number数组转成string数组
// number数组转为string数组
let numArr1 = [2, 3, 1, 1]
let strArr1 = strArr.map(String)
console.log(strArr1)
