jQuery :lang() 选择器
定义和用法
：lang() 选择器选择所有语言属性以指定值开头的元素。
注意：该值必须是一个完整的单词，可以单独使用，例如 lang="en"，或者后面跟着一个连字符 (-)，例如 lang="en-us"。
语法
$(":lang(语言)")
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