javascript - Why I can't use number() on input value? -

why can't use javascript number() on input value?

got html code

<input type="text" id="someid" value="1" min="0"> 

and i'm trying handle javascript with:

var counter = document.getelementbyid("someid"); var currentcounter = counter.value; counter.value = number(currentcounter)+1; 

it's not working. works parseint:

var counter = document.getelementbyid("someid"); var currentcounter = counter.value; counter.value = parseint(currentcounter)+1; 

anybody know why? thank you.

it number, not number

var counter = document.getelementbyid("someid"); var currentcounter = counter.value; counter.value = number(currentcounter) + 1; //-------------^^^^^^^