Is it safe to reference google's JQuery library?

I have included a reference to Google's JQuery library in my markup:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>

Is it safe to do this? How do I know Google won't change t开发者_Go百科he address, or remove it altogether? I really can't afford to have my app break without warning.

What do other people do?

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Have the best of both worlds. Use theirs for fast, possibly pre-cached, delivery and in case their server goes down (more likely than them moving it) fallback to your own:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript">
if (typeof jQuery == 'undefined')
{
    document.write(unescape("%3Cscript src='/path/to/your/jquery' type='text/javascript'%3E%3C/script%3E"));
}
</script>

Taken from: Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail

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Yes, it's completely safe. It's also hosted on Google's CDN making it load faster, in most cases, than loading from your own server.

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Absolutely, it is what you should do!

http://encosia.com/3-reasons-why-you-should-let-google-host-jquery-for-you/

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Google offers it for free. Google's servers are fast and above all you save your bandwidth.

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It is 100% safe to use Google's hosted jQuery file. In fact, it is actually faster because browsers can download multiple files at once from different servers. Also, if the user has visited a website that uses Google's jQuery before, the script will already be in the cache, causing the page to load faster.

Ad@m