javascript - $(...).functionName() is not a function - Why it occurs and how to avoid this? -


i getting console error

$(...).functionname() not function


this function call 

$("button").functionname();


function

$.fn.functionname = function() {        //do }(jquery);


why error comes , how avoid error?

try using following syntax:

jquery.fn.extend({     functionname: function () {      } });

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