JQuery setInterval doesn't start at all

I'm trying to run a function every second but no matter what I have tried it never happens. I have even simplified t开发者_如何学编程he code to

jQuery(function(){ setInterval(function() { alert('interval'); }, 300); })

but it just doesnt do anything. I'm not getting any errors and jquery is definitely installed properly

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jquery is definitely installed properly

Are you trying to say that you have referenced the jquery file from the correct path, something like

<script src="padth to jquery.js" type="text/javascript"></script>

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Thanks for the suggestion guys, the code was correct and jQuery was installed. For some reason restarting my webserver corrected the problem, no idea what happened there.