js恢复select到默认值

<select id="mySelect">
  <option value="default" selected>请选择</option>
  <option value="option1">选项1</option>
  <option value="option2">选项2</option>
  <option value="option3">选项3</option>
</select>

function resetSelectToDefault() {
  var selectElement = document.getElementById('mySelect');
  // 设置selectedIndex为0，即第一个选项
  selectElement.selectedIndex = 0;
}

// 调用函数来重置select元素
resetSelectToDefault();

function resetSelectToDefaultValue(value) {
  var selectElement = document.getElementById('mySelect');
  // 遍历所有选项，找到匹配value属性的选项并设置为选中
  for (var i = 0; i < selectElement.options.length; i++) {
    if (selectElement.options[i].value === value) {
      selectElement.selectedIndex = i;
      break;
    }
  }
}

// 调用函数来重置select元素到特定的默认值
resetSelectToDefaultValue('default');

window.onload = function() {
  resetSelectToDefault();
};