W3School TIY Editor
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<!DOCTYPE html> <html> <body> <p>当您提交表单时，会触发提示文本的函数。</p> <form action="/demo/html/action_page.php" onsubmit="myFunction()"> Enter name: <input type="text" name="fname"> <input type="submit" value="Submit"> </form> <script> function myFunction() { alert("The form was submitted"); } </script> </body> </html>