django 视图函数返回queryset对象或日期对象至浏览器ajax接收的写法

class MyDateTimeEncode(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, datetime):
            return o.strftime('%Y-%m-%d %H:%M:%S')
        elif isinstance(o, date):
            return o.strftime('%Y-%m-%d')
        else:
            return json.JSONEncoder.default(self, o)

def seriallizer_view(request):
    books_obj = models.Book.objects.all()
    # 传queryset对象
    # json_books_obj = serializers.serialize('json', books_obj)
    time1 = datetime.now()
    json_time1 = json.dumps(time1, cls=MyDateTimeEncode)
    if request.method == "POST":
        return HttpResponse(json_time1)
        # return JsonResponse({"key": 'OK'})  # 默认只能传值字典，其余字符串等需要设置参数safe=False
    return render(request, 'serial.html')

前端ajax代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>
    <script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
    <script src="https://cdn.bootcss.com/jquery-cookie/1.4.1/jquery.cookie.js"></script>
</head>
<body>
<button id="btn">点我获取数据</button>

<script>
    $("#btn").click(function () {
        {#$.ajax({#}
        {#    url:"",#}
        {#    type:'post',#}
        {#    contentType:'json',#}
        {#    headers:{"X-CSRFToken":$.cookie("csrftoken")},#}
        {#    data:{},#}
        {#    success:function (res) {#}
        {#        data = JSON.parse(res);#}
        {#        console.log(data[0]);#}
        {#        console.log(typeof res);#}
        {#        for(var i=0;i<data.length;i++)#}
        {#        $("body").append(`<li>${data[i].fields.title}</li>`)#}
        {#    }#}
        {#)#}
        $.ajax({
            url:"",
            type:'post',
            contentType:'json',
            headers:{"X-CSRFToken":$.cookie("csrftoken")},
            data:{},
            success:function (res) {
              console.log(res);
              console.log(typeof JSON.parse(res))
            }
        })
    })
    
</script>
</body>
</html>

ajax代码