javascript - jQuery: Simple plugin does not work -

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i trying create plugin jquery. basic plugin (plugin.js)

(function ( $ ) {  $.fn.testplugin= function() {    alert('test');  }( jquery ));

this file (ext.js) calls function testplugin() inside plugin.js

$(document).ready(function(){  $('p').testplugin();  };

in html page included files above plus jquery library (jquery.js) 

<script type="text/javascript" src="js/jquery.js"></script> <script type="text/javascript" src="js/plugin.js"></script> <script type="text/javascript" src="js/ext.js"></script>

unfortunately plugin not work expected.

well, simple example work (after removed ) mentioned tibzon , wojtek).

$.fn.testplugin=function(){ alert('test'); };    $('p').testplugin()
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

i left out enclosing parenthetical expression (function($){ ... })(jquery) doesn't make difference example chosen. variable affected $ itself.


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