var url = "${path}/fftAction/showBillType.action?fftorg.id=" + obj.value;
    $.post(url,function(data){
        var str = "";
        if(data.zdcx == "Y"){
            str+="<input type='radio' style='width: 20px;'/>"+data.cxfs; 
        }
        if(data.zdxz == "Y"){
            str+="<input type='radio' style='width: 20px;'/>条形码"; 
        }
        $("#billType").html(str);  
    },"json");
    $("#required").show();

<input type="radio" name="sex" value="male" /> Male
<br />
<input type="radio" name="sex" value="female" /> Female

<hr/>

<input type="radio" name="sex1" value="male" /> Male1
<br />
<input type="radio" name="sex1" value="female" /> Female1

------解决方案--------------------
里面加个统一的name就可以，<input type='radio' name='code' style='width: 20px;'/>