TP中ajax请求如何使用模板渲染代替html代码拼接

思路
index.html去ajax请求index控制器下的getdata（）方法，在getdata（）方法里面把数据在cesuan_detail模板里面渲染完，作为结果返回给index.html里。
代码
index.html

var postData = {"xing" : xing, "ming": ming, "sex": sex,"birthday":birthday,"product":product};
        $.post("/index/getdata", postData, function(result){
            if (result.status == 1){
                $(".fitWxParent").show();
                $(".fitWx").html(result.data.htmlStr);
            }else{
                layui.layer.msg(result.msg, {icon:5});
            }
        }, "json");

IndexController.class.php

public function getdata(){
        $xing = I("xing");
        $ming = I("ming");
        $sex = I("sex");
        $birthday = I("birthday");
        $product = I("product");
        $name_list = [1,2,3,4,5,6];
        $isFit = true;
        $this->assign('isFit',$isFit);
        $this->assign('name_list',$name_list);
        $cxdata = $this->fetch('Public/cesuan_detail');
        ajaxSuccess([
            'htmlStr' => $cxdata
        ]);
    }