How to get input value as a number in javascript?

Question

input value return as a string.

Answer 1

Number() will auto-cast float or int, but you can also use parseInt() or parseFloat() if you want to force to a specific type ^^

Answer 2

var yourString = "12";
var number = Number(yourString);

Jquery example with input:
var value = Number($("input").val());

Answer 3

var num = 12;