js代码实现二级联动效果

<select id="sel" onchange="change()">
                
                <option value="0">运输方式</option>
                <option value="物流">物流</option>
                <option value="快递">快递</option>
                
            </select>
            
            <select id="son">
                <option value="0">物流</option>
                
            </select>

<script>
        <select id="sel" onchange="change()">