<!DOCTYPE html> <html> <head> <script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-1.9.0.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("p.intro").hide(); }); }); </script> </head> <body> <h2 class="intro">Title</h2> <p class="intro">id="intro", content</p> <p>Content</p> <button>ここにクリックして</button> </body> </html>