jquery获取和设置radio的值

<label class="radio inline">
<input type="radio" name="sku_or_asin" id="sku_or_asin_hit1" value="1"> SKU-Specified
</label>
<label class="radio inline">
<input type="radio" name="sku_or_asin" id="sku_or_asin_hit2" value="2"> ASIN-Specified
</label>
<label class="radio inline">
<input type="radio" name="sku_or_asin" id="sku_or_asin_hit3" value="3" checked="checked"> Default Template
</label><label class="radio inline">
<input type=