用jquery方法操作radio使其默认选项是否

<tr>
<th>是否映射：</th>
<td>
<input type="radio" name="sfys" class="radio" id="yes"
value="1"/><label for="yes">是</label>
<input type="radio" name="sfys" class="radio" id="no"
value="0"/><label for="no">否</label>
</td>
</tr>

$(function () {
var sfys = "<#if os??&&os.sfys??>${os.sfys}</#if>";
if (sfys == 1) {
$("#yes").attr(checked, checked);
} else {
$("#no").attr(checked, checked);
}
});