Answers for "check if variable is contains number"

javascript check if variable is number

function isNumber(n) {
  return !isNaN(parseFloat(n)) && !isNaN(n - 0);
}

check if value is number

if(isNaN(num1))
OR:
if(typeof num1 == 'number'){
    document.write(num1 + " is a number <br/>");
 }else{
    document.write(num1 + " is not a number <br/>");
 }