wb关闭时保留组合框的值

// 保存组合框的值到本地存储
window.addEventListener('beforeunload', function() {
  var selectedValue = document.getElementById('myComboBox').value;
  localStorage.setItem('selectedValue', selectedValue);
});

// 页面加载完成后，设置组合框的默认选项
window.addEventListener('load', function() {
  var selectedValue = localStorage.getItem('selectedValue');
  if (selectedValue) {
    document.getElementById('myComboBox').value = selectedValue;
  }
});