1.将string数组转换为number数组

let strArr = ["2", "3", "1", "1"];
let numArr = strArr.map(Number);
console.log(numArr);   //[2, 3, 1, 1]

2.将number数组转成string数组

let numArr1 = [2, 3, 1, 1];
let strArr1 = strArr.map(String);
console.log(strArr1);     //['2', '3', '1', '1']
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