使用JavaScript从select标签获取数据

var selectElement = document.getElementById("mySelect");

var selectedOption = selectElement.options[selectElement.selectedIndex];

var optionValue = selectedOption.value;
var optionText = selectedOption.text;

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

<script>
  var selectElement = document.getElementById("mySelect");
  var selectedOption = selectElement.options[selectElement.selectedIndex];
  var optionValue = selectedOption.value;
  var optionText = selectedOption.text;

  console.log("选中的选项值：" + optionValue);
  console.log("选中的选项文本：" + optionText);
</script>