JQuery：单选框，复选框取值

<div style="width:100%; border:solid 1px #0000ff; line-height:25px">    
   　  <input type="radio" name="items" id="item1" value="1" checked="checked" />1&nbsp;&nbsp;&nbsp;&nbsp;
        <input type="radio" name="items" id="item2" value="2"/>2&nbsp;&nbsp;&nbsp;&nbsp;  
        <input type="radio" name="items" id="item3" value="3"/>3&nbsp;&nbsp;&nbsp;&nbsp;
        <input type="radio" name="items" id="item4" value="4"/>4&nbsp;&nbsp;&nbsp;&nbsp;
        <input type="radio" name="items" id="item5" value="5"/>5
        <br/>
        <input id="bt_radio" type="button" value="单选框测试">

<script type="text/javascript"> 
div>