如何在页面加载/提交时将checkbox设置为默认false？

<input type="checkbox" checked="false">

<input type="checkbox" id="myCheckbox">

<script>
window.onload = function() {
  document.getElementById("myCheckbox").checked = false;
};
</script>

<input type="checkbox" id="myCheckbox">

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function() {
  $("#myCheckbox").prop("checked", false);
});
</script>