我找到了一个解决办法：
首先需要在Django视图中添加一个端点：

# views.py
from django.http import JsonResponse

def address_lookup(request):
    postcode = request.GET.get('postcode')
    house_number = request.GET.get('house_number')
    full_address = address_find(postcode, house_number)
    return JsonResponse({'full_address': full_address})

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然后需要为新视图创建一个URL模式：

# urls.py
from django.urls import path
from .views import address_lookup

urlpatterns = [
    # other patterns
    path('address_lookup/', address_lookup, name='address_lookup'),
]

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最后需要编写JavaScript来处理表单输入：

<script>
    // Add event listeners to input fields
    document.getElementById('postcode').addEventListener('input', updateAddress);
    document.getElementById('house_number').addEventListener('input', updateAddress);

    function updateAddress() {
        // Get values from input fields
        var postcode = document.getElementById('postcode').value;
        var houseNumber = document.getElementById('house_number').value;

        // Make an Ajax request to the server
        var xhr = new XMLHttpRequest();
        xhr.open('GET', '/address_lookup/?postcode=' + postcode + '&house_number=' + houseNumber, true);
        xhr.onreadystatechange = function () {
            if (xhr.readyState === 4 && xhr.status === 200) {
                // Update the displayed address
                document.getElementById('fullAddress').innerText = JSON.parse(xhr.responseText).full_address;
            }
        };
        xhr.send();
    }
</script>

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