50 个jquery 好的用法
http://www.gbin1.com/technology/jquery/50jquerycodesnippetsforbetterjavascript/index.html
http://addyosmani.com/blog/50-jquery-snippets-for-developers/
How to Create A Nested Filter:
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//a filter allows you to reduce the set of matched elements
//to those that match a given selector. In this case the query
//removes anything which doesn't (:not) have (:has) a child with
//class "selected" (.selected)
.filter(":not(:has(.selected))")
