<select name="tableName"> <option value="user_node_isp" id="user_node_isp" >节点isp用户</option> <option value="user_node" id="user_node" >节点用户</option> </select>
$("#tableName option[value='user_node']").attr("selected", true);
<select name="tableName"> <option value="user_node_isp" id="user_node_isp" >节点isp用户</option> <option value="user_node" id="user_node" >节点用户</option> </select>
$("#tableName option[value='user_node']").attr("selected", true);