javascript - document.getElementById(fieldName).value; is not working in chrome and firefox -

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following javascript in html working in ie browser. but, when execute in chrome , firefox browser not working. 

var lastname = getvalueoffield("txtname");  function getvalueoffield(fieldname)     {         return document.getelementbyid(fieldname).value;     }

please me.

it working fine...

fiddle

<input type="text" id="txtname" value="testdata">  var lastname = getvalueoffield("txtname"); function getvalueoffield(fieldname)     {     console.log(document.getelementbyid(fieldname).value)         return document.getelementbyid(fieldname).value;     }

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