แก้ไขโค้ด:
เห็นผล »
ลองตัวเอง - ©
w3ii.com
<!DOCTYPE html> <html> <body> <p>This example uses the addEventListener() method to attach a click event to a button.</p> <button id="myBtn">Try it</button> <script> document.getElementById("myBtn").addEventListener("click", function(){ alert("Hello World!"); }); </script> </body> </html>