Using JavaScript function from HTML Button doesn't work -

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i'm working xdk , want add html button should call js function. js file created in project , included <script type="text/javascript" src="app.js"></script>

my button code is:

<form>     <input id="change_button" type="button" value="change" onclick="change();"/> </form>

and js function:

function change() {     alert("hello! alert box!!"); }

for reason nothing happens when press button. maybe i'm missing something. hints how solve problem.

the function should work, check path of app.js file


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