javascript - Functions not changing the second time its called Jquery/JS -

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i'm new js , trying use functions call later different values. function seems applying first value in both instances.

html

<div class="quality">     <span id="quality" data-avgquality="28"></span> </div> <div class="cost">     <span id="cost" data-avgcost="50"></span> </div>

js

$(document).ready(function(){            var qualitydata = $("#quality").attr("data-avgquality");     var costdata = $("#cost").attr("data-avgcost");      function loaddata(id,data)      {         $("#"+id+"").animate({ "width" : qualitydata+"%" }, 1500 );     };      loaddata("quality",qualitydata);     loaddata("cost",costdata);  });

when run data value both comes 28%.

change 

function loaddata(id,data)  {     $("#"+id+"").animate({ "width" : qualitydata+"%" }, 1500 ); };

to

function loaddata(id,data)  {     $("#"+id+"").animate({ "width" : data +"%" }, 1500 ); };

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