JavaScript调用ajax发送一个json

$('#cc').click(function () {            mdffilepath = {                'name1': 'aaaa1','name2': 'aaaa2','name3': 'aaaa3','name4': 'aaaa4'//要发送的字典，在JavaScript里被定义为对象            }; //传输数据            $.ajax({                type: 'POST',                url: '/calc/read_inca_func',                data: JSON.stringify(mdffilepath),//将对象打包成json的字符串发送，对应下面也要将字符串解码成字典                contentType: 'application/json;charset=UTF-8',//编码格式                dataType: 'json',                success: function (data) {                    console.log(typeof(data["calc"]));//打印为字符串                    console.log(data["calc"]);//打印为对象object                }            })        })

from flask import Flask,render_template, request, url_for, jsonifyimport osimport jsonimport sysimport subprocessapp = Flask(__name__)//与下面的  app.run()对应app.config['SECRET_KEY'] = "dfdfdffdad"//抄的，不知道干嘛@app.route('/')def index():    return render_template('index.html')@app.route('/calc/read_inca_func', methods=['POST'])def upload_file():    a=request.get_data()//得到JavaScript发送的字符串流    print(type(a))//bytes    s1 = str(a, encoding='utf-8')//解码为string    print(type(s1))    print(s1)    user_dict1 = json.loads(s1)//将string变成dict    for key in user_dict1.keys():        print(key,user_dict1[key])    user_dict = json.loads(a)//将bytes变成dict    # info = eval(str(requests.post(url_now).content.decode()))//抄的，不知道什么意思    for key in user_dict.keys():        print(key,user_dict[key])    dict4={"calc":"fail"}    return jsonify(dict4)if __name__ == '__main__'://flask实例化，上面相当于类的子函数    app.run()