<select id="myid">
    <option value ="1">one</option>
    <option value ="2">two</option>
    <option value="3">three</option>
    <option value="4">four</option>
</select>

var myId = $("#myid").val();   // 获取select value值
var myIdName = $("#myid option:checked").text();  // 获取select 显示值