jQuery 获取select选中的option
alert($("#id option:selected").val());
<selected >
<option value="1" selected="selected">1</option>
<option value="2">2</option>
</selected>
alert($("#id option:selected").val());
<selected >
<option value="1" selected="selected">1</option>
<option value="2">2</option>
</selected>