ifModified-Etag 介绍
This plugin provides Etag support to jQuery AJAX calls that have
ifModified set.
Note: I don’t advise using this plugin with a jQuery 1.2 unless this page
states
otherwise by the time it is released. This functionality may be incorporated
into 1.2 itself.
Documentation: None necessary. Just include the javascript and Etag will be
supported alongside
Last-Modified method of caching.
Compatibility: 1.1.2, 1.1.3a, 1.1.3
only tested with older version of plugin