该模板不会在发出发布请求时呈现

Question

我正在尝试构建MNIST分类器并使用flask进行部署。我在javascript向'/'路由发出发布请求时呈现模板时遇到问题。我想将预测结果显示在同一页面上。请帮帮我。

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'GET':
        return render_template("index.html", value = "Output")
    if request.method == 'POST':
        print("Image recieved")
        data_url = request.values
        x = [i for i in data_url.items()]
        url = x[0][1]

        newimg = Image.open(urllib.request.urlopen(url))

        transform = transforms.Compose([transforms.Resize((32, 32)), 
                                        transforms.Grayscale(1),
                                        transforms.ToTensor(),
                                        transforms.Normalize((0.5,), (0.5,))
                                       ])

        newimg = transform(newimg).unsqueeze(0)

        model = get_model()
        model.eval()
        output = model(newimg)

        pred = output.argmax(dim=1)
        print("Predicted value : ", pred.item())

        return render_template("index.html", value = pred)


if __name__ == "__main__":
    app.run(debug = True)

这是javascript请求：

$.ajax({
        type: "POST",
        url: "http://localhost:5000/",
        data: { 'data' : d},
      }).done(function() {
        console.log("Sent");
      });