performs concatenation instead of addition javascript [closed]

Answer 1

This line:

var y=$("#text").val();

returns a string.

What you need to do is convert/coerce this result to a number using one of the following methods:

var y = parseInt($("#text").val(), 10);

var y = parseFloat($("#text").val()); //  returns a floating point number

var y = Number($("#text").val());

var y = +$("#text").val();