// 分别选择所有语言，所有动态语言，所有静态语言，JavaScript，Lua，C等:
selected = $('div.test-selector li');
selected = $('ul.test-lang>li');
selected = $('ol.test-lang>li');
selected = $('ul.test-lang>li.lang-javascript');
selected = $('ul.test-lang li:last-child');
selected = $('ol.test-lang li.lang-c');