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jQuery - attr

 <input type="text" name="mytext" id="mytext" data-custom="custom value"/>

get the value of attribute:
  var defaultData = $('#mytext').attr('value');
set the value of attribute:
  var defaultData = $('#mytext').attr('value','love');
or
var defaultData = $('#mytext').attr({'value':'love','title':'my title','disabled':true});
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