<input type="radio" id="myRadioButton" name="myRadioGroup" value="option1"> Option 1
<input type="radio" id="myRadioButton" name="myRadioGroup" value="option2"> Option 2

<script>
  var radioButton = document.getElementById("myRadioButton");
  
  if (radioButton.checked) {
    console.log("选中了该单选按钮");
  } else {
    console.log("未选中该单选按钮");
  }
</script>

<form method="post" action="process.php">
  <input type="radio" name="myRadioGroup" value="option1"> Option 1
  <input type="radio" name="myRadioGroup" value="option2"> Option 2
  <input type="submit" value="Submit">
</form>

<?php
  if (isset($_POST['myRadioGroup'])) {
    echo "选中了该单选按钮";
  } else {
    echo "未选中该单选按钮";
  }
?>