將JS數組轉成Number類型或者String類型
1.將string數組轉成number數組
// 字符數組轉數字數組
let strArr = ["2", "3", "1", "1"]
let numArr = strArr.map(Number)
console.log(numArr)
2.將number數組轉成string數組
// number數組轉為string數組
let numArr1 = [2, 3, 1, 1]
let strArr1 = strArr.map(String)
console.log(strArr1)
