应用迁移辅助插件
jQuery 版本之间有区别如1.9版本对于 live() die() toggle() sub() $.browser 等等不支持了。 在不改变你网站代码的同时 要使用 1.9 之后的版本 需要使用 jQuery migrate（转移、过度）
//blog.jquery.com/2013/01/31/jquery-migrate-1-1-0-released/

jquery-migrate-1.1.0.js
就是 在原来代码上升级jquery 不用修改代码用的一个过渡插件

Thanks for all your feedback on jQuery 1.9.0! We’re preparing an update to address the issues you’ve found already, but in the meantime here’s a new version of the jQuery Migrate plugin. The plugin can be used with either 1.9 or 2.0 to detect deprecated and removed features, or to restore old features for those sticky situations where you need old code to run with new jQuery. The plugin and the messages it generates are documented in the project README.

Judging by many of the questions and bug reports we’ve gotten, far too many of you are trying to do an upgrade to jQuery 1.9 without also using jQuery Migrate. Stop hitting yourself! We created this plugin to make things easy on you. Just include the plugin after your jQuery file to see if it gives you any warnings. The updated jQuery Migrate plugin is available on jQuery’s CDN, and should be available on the Google and Microsoft CDNs within a few days:

 
 


With this development version, warning messages appear on the browser’s console.
They all start with JQMIGRATE so they’re easy to find. Just match up each message with its description in the warning list to determine what it means and how it can be fixed.

In a perfect jQuery world, you’ll be able to update your code and run without the jQuery Migrate plugin. But we’re realists, and know that it may be a while before you and the authors of your plugins can get around to fixing compatibility issues. We’ve got you covered there as well. Just use the minified version and the plugin’s fixes will stay, but the warnings will be silenced so you can deploy to production:

 
 

Finally, remember that you can include the jQuery Migrate plugin with your existing copy of jQuery all the way back to 1.6.4, to see what issues may arise when you do get around to upgrading.