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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("#btn1").click(function(){ $("#test1").text(function(i, origText){ return "Old text: " + origText + " New text: Hello world! (index: " + i + ")"; }); }); $("#btn2").click(function(){ $("#test2").html(function(i, origText){ return "Old html: " + origText + " New html: Hello <b>world!</b> (index: " + i + ")"; }); }); }); </script> </head> <body> <p id="test1">This is a <b>bold</b> paragraph.</p> <p id="test2">This is another <b>bold</b> paragraph.</p> <button id="btn1">Show Old/New Text</button> <button id="btn2">Show Old/New HTML</button> </body> </html>