W3Schools 線上編輯器 - W3Schools 教學

<!DOCTYPE html>
<html>
<body>

<p>This example contains a form with two submit buttons. The first submit button submits the form-data with method="get", and the second submits the form-data with method="post":</p>

<form action="/action_page.php" method="get">
  First name: <input type="text" name="fname" value="Donald"><br>
  Last name: <input type="text" name="lname" value="Duck"><br>
  <button type="submit">Submit</button>
  <button id="myBtn" type="submit" formmethod="post">Submit using POST</button>
</form>

<p>If you click on the submit buttons above, notice that the formmethod attribute overrides the HTML form's method attribute.</p>

<p>Click the button below to return the value of the formmethod attribute of the second submit button above.</p>

<button onclick="myFunction()">Return formmethod of the second button</button>

</body>
</html>