python学习-- django 2.1.7 ajax 请求

#--------------views.py----------------------

def add(request):
    a = request.GET['a']
    print(a)
    b = request.GET['b']
    a = int(a)
    b = int(b)
    return HttpResponse(str(a+b))

#--------------templates/*.html----------------------

{% extends 'base.html' %}
{% load static %}  #目的 <script src="{% static "js/jquery.min.js" %}"></script>  没有这个不现实 js引用

{% block content %}
<form action="/add/" method="get">
    a: <input type="text" id="a" name="a"> <br>
    b: <input type="text" id="b" name="b"> <br>
    <p>result: <span id='result'></span></p>
    <button type="button" id='sum'>提交</button>
</form>

    <script src="{% static "js/jquery.min.js" %}"></script>
    <script type="application/javascript">
     $(document).ready(function(){
      $("#sum").click(function(){

        var a = $("#a").val();
        alert(a);
        var b = $("#b").val();
        alert(b);
        $.get("/add/",{'a':a,'b':b}, function(ret){ 
            $('#result').html(ret)
        })
      });
    });
    </script>
{% endblock %}

#-----------urls.py----------------------------------------------------------*

urlpatterns = [
    path('add/',views.add,name='add'),
    path('admin/', admin.site.urls),
]