通过jQuery获取页面中radio选中的值

<tr>
    <td class="tdtext" colspan="3">2、廉洁自律，不利用岗位职权方便谋取私利。</td>
    <td class="trss"><input name="radio17" type="radio" value="5" required/></td>
    <td class="trss"><input name="radio17" type="radio" value="4" /></td>
    <td class="trss"><input name="radio17" type="radio" value="3" /></td>
    <td class="trss"><input name="radio17" type="radio" value="2" /></td>
    <td class="trss"><input name="radio17" type="radio" value="1" /></td>
</tr>

        var value17 = $('input[name="radio17"]:checked').val()