jquery修改获取radio的选中项

<input id="txtBeginDate" onclick="$(\'#divDate\').css({\'top\':$(\'#txtBeginDate\').offset().top+\'px\',\'left\':$(\'#txtBeginDate\').offset().left+\'px\'})" style="width:170px;padding:7px 10px;border:1px solid #ccc;margin-right:10px;"/>
            <label><input type="radio" name="sotype" value="0" checked/>商城</label>
            <label><input type="radio" name="sotype" value="1" />团购</label>
            <label><input type="radio" name="sotype" value="2" />行业</label>
            <button type="button" name="appidsubmit" onclick="chaxun()" value="true" class="btnGreen vm" ><strong>查询</strong></button>
            <script>
            $(document).ready(function(){
                var type = 1;
                if(type==1){
                    $(\'input[name="sotype"]:eq(1)\').attr("checked",\'checked\'); 
                }else if(type==2){
                    $(\'input[name="sotype"]:eq(2)\').attr("checked",\'checked\'); 
                }
            });
　　　　　　</script>

 $(\'input[name="sotype"]:checked\').val();//获取选中的值