dedecms自定义联动

<select id="province" onchange="updateCity()">
    <option value="">请选择省份</option>
    <!-- 省份选项 -->
</select>

<select id="city">
    <option value="">请选择城市</option>
    <!-- 城市选项 -->
</select>

function updateCity() {
    var province = document.getElementById('province').value;
    var citySelect = document.getElementById('city');
    citySelect.innerHTML = '<option value="">请选择城市</option>';

    // 发送AJAX请求获取城市数据
    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4 && xhr.status == 200) {
            var cities = JSON.parse(xhr.responseText);
            for (var i = 0; i < cities.length; i++) {
                var option = document.createElement('option');
                option.value = cities[i].id;
                option.text = cities[i].name;
                citySelect.appendChild(option);
            }
        }
    };
    xhr.open('GET', 'getCity.php?province=' + province, true);
    xhr.send();
}

<?php
$province = $_GET['province'];
// 根据省份获取城市数据
$cities = array(
    // 城市数据
);
echo json_encode($cities);
?>