js string has only number 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: js string have number js

var hasNumber = /\d/;   
      hasNumber.test("ABC33SDF");  //true
      hasNumber.test("ABCSDF");  //false