js怎么回去select的值

// 假设有一个select元素，id为'mySelect'
var selectElement = document.getElementById('mySelect');
var selectedValue = selectElement.value;
console.log(selectedValue);

// 同样假设select元素的id为'mySelect'
var selectElement = document.getElementById('mySelect');
var selectedIndex = selectElement.selectedIndex;
var selectedOption = selectElement.options[selectedIndex];
var selectedValue = selectedOption.value;
console.log(selectedValue);

<select id="mySelect">
  <option value="">请选择</option>
  <option value="option1">选项1</option>
  <option value="option2">选项2</option>
</select>

<script>
  function getSelectedValue() {
    var selectElement = document.getElementById('mySelect');
    if (selectElement) {
      var selectedValue = selectElement.value;
      console.log(selectedValue);
    } else {
      console.error('无法找到指定的select元素');
    }
  }
</script>

<select id="select1">
  <!-- options here -->
</select>

<select id="select2">
  <!-- options here -->
</select>

<script>
  function getValues() {
    var value1 = document.getElementById('select1').value;
    var value2 = document.getElementById('select2').value;
    console.log('Select 1:', value1);
    console.log('Select 2:', value2);
  }
</script>