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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("p:has(span)").css("border","solid red"); }); </script> </head> <body> <p><span>p 元素中的 span 元素</span></p> <p>这个 p 元素没有 span 元素</p> </body> </html>