buttonclick - javascript linking onclick to a .js to a file -

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i created .js file, , included in html pages by:

<script type="text/javascript" src="yourexternalfile.js"></script>

how call function of .js file using onclick = "...." ?

i know like: 

<input type="button" value="exit" onclick="javascript: ???;" >

but can't figure out...

if using jquery, can this,

       <input type="button" onclick="javascript: $.getscript('../scripts/yourfilepath' , function (){ youfunctioncall() ; } );" />

this download js file when button cliked , shall execute function called within.


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