点击运行
<!DOCTYPE html> <html> <head> <script type="text/javascript" src="/static/jquery/jquery.min.js"></script> <style> p, div { margin:5px; padding:5px; } .border { border: 2px solid red; } .background { background:yellow; } </style> </head> <body> <div> <p>First Paragraph</p> <p>Second Paragraph</p> </div> <script> $("div").find("p").andSelf().addClass("border"); $("div").find("p").addClass("background"); </script> </body> </html>
运行结果
