Digital JavaScript & amp; chain problem

Hello world
I have a form that takes two fields as numerical values, and with the function javascript the sum of these two values should appear after that any changes. but instead of the SUM she CONCATENATE these two values. How can I tell Javascript function that these are digital, not string?
Thank you for your help in advance.
(I know this is a section of CF, but I think that people in the CF use js as well)

var a = 1;
var b = 2;

$ var = parseInt (a) + parseInt (b);

(there also a parseFloat() If you do not deal exclusively with the ints)

Tags: ColdFusion

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