需要从数组中删除字符串

Question

我在 for 循环中有一个数组，如下所示：var arr = ["abc", "5", "city", "2", "area", "2", "max", "choice"];我只需要这样的数字：var arr = ["5","2","2"];所以有人可以在这里帮忙。

Answer 1

filter 当它们被强制为 1 时，将作为整数的字符串输出：

var arr = ["abc", "5", "city", "2", "", "area", "2", "max", "choice"];

const out = arr.filter(el => (

  el !== '' && Number.isInteger(Number(el)))

);

console.log(out)

Answer 2

使用forEach循环和检查使用isNaN()

var arr = ["abc", "5", "city", "2", "area", "2", "max"];

var a=[];

arr.forEach(e=>isNaN(e)?true:a.push(e))

console.log(a)