这个怎么不行呢？

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#1 Created at ... [Delete] [Delete and Lock User]

我之前有用这句可以

selected = $('ul.test-lang li.lang-javascript');

后来想用过滤器试试，结果报错

selected = $('ul.test-lang li:lang-javascript');

Error: Syntax error, unrecognized expression: unsupported pseudo: lang-javascript

#2 Created at ... [Delete] [Delete and Lock User]

过滤器好像不是那样用， li: 后面的是筛选条件

#3 Created at ... [Delete] [Delete and Lock User]

selected = $('ul.test-lang li:first-child');