js怎么获取radio的值和下拉框的值，赋值给radio标签，select标签

$("input[name='rating']:checked").val();

<div>
<input type ="radio" name="rating" value="1">1
<input type ="radio" name="rating" value="2">2
<input type ="radio" name="rating" value="3">3
<input type ="radio" name="rating" value="4">4
</div>

<div>
<select id="selectType" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
</div>

$("#selectType option:selected").text();//选中的文本
$("#selectType option:select").val();//选中的值
$("#selectType option:select").selectedIndex;//索引