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源代码：
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<!DOCTYPE html> <html> <head> <script src="//libs.baidu.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("p").not(function(){ return $("span",this).length==2;}).css("background-color","yellow"); }); </script> </head> <body> <div> <p>A p element <span>with one span element.</span></p> <p>A p element <span>with</span> two <span>span elements.</span></p> <p>A p element <span>with one span element.</span></p> <p>A p element <span>with</span> two <span>span elements.</span></p> <p>A p element with no span element.</p> </div> <div>This example returns all p elements that do not have two span elements.</div> </body> </html>
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