根据下拉选项更改多个输入字段的值(js或PHP开关)

<select id="dropdown">
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

<input type="text" id="input1" value="">
<input type="text" id="input2" value="">

var dropdown = document.getElementById("dropdown");
var input1 = document.getElementById("input1");
var input2 = document.getElementById("input2");

dropdown.addEventListener("change", function() {
  var selectedOption = dropdown.value;
  
  if (selectedOption === "option1") {
    input1.value = "Value 1";
    input2.value = "Value 2";
  } else if (selectedOption === "option2") {
    input1.value = "Value 3";
    input2.value = "Value 4";
  } else if (selectedOption === "option3") {
    input1.value = "Value 5";
    input2.value = "Value 6";
  }
});

<form action="update_values.php" method="post">
  <select name="dropdown">
    <option value="option1">Option 1</option>
    <option value="option2">Option 2</option>
    <option value="option3">Option 3</option>
  </select>

  <input type="text" name="input1" value="">
  <input type="text" name="input2" value="">

  <input type="submit" value="Submit">
</form>

<?php
$selectedOption = $_POST['dropdown'];

if ($selectedOption === "option1") {
  $input1Value = "Value 1";
  $input2Value = "Value 2";
} else if ($selectedOption === "option2") {
  $input1Value = "Value 3";
  $input2Value = "Value 4";
} else if ($selectedOption === "option3") {
  $input1Value = "Value 5";
  $input2Value = "Value 6";
}

// 返回对应的输入字段值
$response = array(
  'input1' => $input1Value,
  'input2' => $input2Value
);

echo json_encode($response);
?>