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<!doctype html> <html lang="vi"> <head> <meta charset="utf-8"> <title>Học web chuẩn</title> <script src="https://code.jquery.com/jquery-latest.js"></script> <script> $(function(){ $("button").click(function () { var text = $(this).text(); $("input").val(text); }); }); </script> </head> <body> <input type="text" value=""> <button>CSS</button> <button>HTML</button> <button>JQUERY</button> </body> </html>