how to check if string contain only digits js code example

Example 1: check if string only contains integer digits numbers javascript

let val = '1234567890' 
let isnum = /^\d+$/.test(val);
if (isnum) {
  // val is a number
}

Example 2: check if a string contains digits js

function hasNumber(myString) {
  return /\d/.test(myString);
}