jQuery 1.9 Final & jQuery 2.0 Beta:not(ie6~8) & jQuery Migrate 1.0

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jQuery 1.9 and 2.0 have the same API. Several deprecated features such as $.browser have been removed from both versions. It’s all laid out in the jQuery 1.9 upgrade guide (http://jquery.com/upgrade-guide/1.9/).
jQuery 1.9 runs on Internet Explorer 6, 7, and 8 (“oldIE”), just like previous versions. Consider it a cleaner, slimmer, modern-API upgrade from jQuery 1.8.
jQuery 2.0 will not run on oldIE. As a result of removing several layers of barnacle-encrusted code, it will be both faster and smaller than jQuery 1.9.
The team is supporting both jQuery 1.9 and 2.0 into the future. You choose which version you want to use based on your needs.


261 k
http://code.jquery.com/jquery-1.9.0.js
http://code.jquery.com/jquery-1.9.0.min.js

16 k
http://code.jquery.com/jquery-migrate-1.0.0.js
http://code.jquery.com/jquery-migrate-1.0.0.min.js

230 k (-31k)
http://code.jquery.com/jquery-2.0.0b1.js
http://code.jquery.com/jquery-2.0.0b1.min.js





<!--[if lt IE 9]>
<script src="jquery-1.9.0.js"></script>
<![endif]-->
<!--[if gte IE 9]><!-->
<script src="jquery-2.0.0.js"></script>
<!--[endif]-->



http://blog.jquery.com/2013/01/15/jquery-1-9-final-jquery-2-0-beta-migrate-final-released