javascript - JQuery Variables for Arithmetic being treated as strings -

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this question has answer here:

i trying month 3 months selected month using html select box , jquery in below code. code not adding 2 variables instead treating them 2 strings. assist me right?

<body>     <form role="form" class="form-inline">         <div class="form-group">             <label class="control-label" for="q1month">                 quarter 1 month             </label>             <select class="form-control" id="q1month">                 <option selected value=''>--select month--</option>                 <option value='1'>january</option>                 <option value='2'>february</option>                 <option value='3'>march</option>                 <option value='4'>april</option>                 <option value='5'>may</option>                 <option value='6'>june</option>                 <option value='7'>july</option>                 <option value='8'>august</option>                 <option value='9'>september</option>                 <option value='10'>october</option>                 <option value='11'>november</option>                 <option value='12'>december</option>             </select>         </div>     </form>     <script src="js/jquery.js"></script>     <script>     $(function() {         $('#q1month').change(function() {             var month = $(this).val();             $('#q2month').val(month);             var advanceby = 3;             var newmonth = month + advanceby;             window.alert(newmonth);         });     });     </script> </body>

when value read dom, string. convert number can use unary + operator.

add + in front of value

var month = +$(this).val();

+ concatenation operator in javascript, when 1 of operand string + used string concatenation.

$(function() {    $('#q1month').change(      function() {        var month = $(this).val();        $('#q2month').val(month);        var advanceby = 3;        var newmonth = month + advanceby;        window.alert(newmonth);      });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>  <form role="form" class="form-inline">    <div class="form-group">      <label class="control-label" for="q1month">        quarter 1 month      </label>      <select class="form-control" id="q1month">        <option selected value=''>--select month--</option>        <option value='1'>january</option>        <option value='2'>february</option>        <option value='3'>march</option>        <option value='4'>april</option>        <option value='5'>may</option>        <option value='6'>june</option>        <option value='7'>july</option>        <option value='8'>august</option>        <option value='9'>september</option>        <option value='10'>october</option>        <option value='11'>november</option>        <option value='12'>december</option>      </select>    </div>  </form>


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