<html>
<body>
<form id="myForm" action="https://www.w3schools.com/action_page.php" method="get" target="_blank">
First name: <input type="text" name="fname" value="Donald"><br>
Last name: <input type="text" name="lname" value="Duck"><br>
<input type="submit" value="Submit">
</form>
<p>Click the "Change method" button to change the method in the form above.</p>
<p><b>Note:</b> Click the "Submit" button before and after you have clicked the "Change method" button, and check the browser's address bar to see the effect.</p>
<button onclick="myFunction()">Change method</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("myForm").method = "post";
document.getElementById("demo").innerHTML = "The method was set to 'post'.";
}
</script>
</body>
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</html>