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不写作业要挨打

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// 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');//所有语言
selected = $('ul.test-lang li,li.lang-swift');//所有动态语言，JavaScript/Python/Swift/Lua
selected = $('.lang-java,.lang-c');//所有静态语言，Java/C
selected = $('ul li:first-child');//JavaScript
selected = $('ul li:last-child');//Lua
selected = $('ol li:last-child');//C
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