基于Flask创建Python服务端，并调用JavaScript客户端

from flask import Flask, request
from flask_cors import CORS
class AiServer(object):
    def __init__(self):
        server = Flask(__name__)
        CORS(server, supports_credentials=True)
        server.route('/post', methods=['POST'])(self.post)
        server.run(port=8000, threaded=True)
    def post(self):
        if request.method == "POST":
            print("get post")
            response_data = request.get_data()
            print("response_data", response_data)
            return "Hello"
if __name__ == '__main__':
    AiServer()

<script>
  function createXMLHTTPObject()
    {
      var XMLhttpFactories = [//兼容不同浏览器和版本的创建函数数组
          function() {return new XMLHttpRequest()},
          function() {return new ActiveXObject("Msxml2.XMLHTTP")},
          function() {return new ActiveXObject("Msxml3.XMLHTTP")},
          function() {return new ActiveXObject("Microsoft.XMLHTTP")},
      ];
      var xmlhttp = false;
      for (var i = 0; i < XMLhttpFactories.length; i++)
      {
          try
          {
            xmlhttp = XMLhttpFactories[i]();
            break; //如果成功，则终止循环
          }
          catch (e)
          {
            continue; //如果异常，则继续使用下一个创建函数
          }        
      }
      return xmlhttp;
    }
    xmlhttp = createXMLHTTPObject();
    var receive_data;
    xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            receive_data = this.responseText
            console.log("rece:", this.responseText);
            // myObj = JSON.parse(this.responseText);
            // console.log(myObj);
        }
    };
    asynchronous_type = false;  //True为异步，false为同步
    xmlhttp.open("POST", "http://localhost:8000/post", asynchronous_type);
    // 发送数据格式：https://www.cnblogs.com/softidea/p/5745369.html  # x-www-form-urlencoded
    xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    obs = {num : 1}
    json_data = JSON.stringify(obs)
    xmlhttp.send(json_data)
    console.log(receive_data)
</script>