.val()
Run
↔
<!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(){ var inputVal = $('input').val(); $('button').click(function(){ alert(inputVal); }); }); </script> </head> <body> <input type="text" value="12"> <button>Click</button> </body> </html>
