What is JQuery IsNumeric like function in Javascript?

There is no IsNumeric similar built-in function in Javascript, but you can create your own method

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

You can test this in Javascript

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

console.log(isNumeric( "-10" )); // true
console.log(isNumeric( 0xFF )); // true
console.log(isNumeric( "3.1415" ));//true
console.log(isNumeric( +10 )); // true


console.log(isNumeric( {} ));//false
console.log(isNumeric( NaN ));//false
console.log(isNumeric( null ));//false
console.log(isNumeric( true ));//false

You can verify it on fiddle: https://jsfiddle.net/6m9qobs1/

Hope it helps.