php - checking javascript is enabled -

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i building html page. make quick 1 line test which, if user has javascript enabled says "javascript on" otherwise says "javascript off" let them know.

how can this?

<div id="js_onoff">javascript off :(</div> <script>     document.getelementbyid("js_onoff").innerhtml = "javascript on, yeah! :)"; </script>

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