前端代码如下

后端代码如下：
import os
import sys
from flask import Flask, request, jsonify, make_response, abort, json, send_from_directory
from flask_cors import *
import json
app = Flask(__name__)
#设置跨域
CORS(app, supports_credentials=True)
@app.route('/getlunbo', methods=['GET'])
def getlunbo():
    test={
        "id": "1",
        "picurl": 'www.baidu.com'
    }
    return json.dumps(test)
    
def main():
    app.run(host='0.0.0.0', port=8808)

if __name__ == '__main__':
    main()

解决方法是在后端python flask 设置允许跨域即
设置CORS(app,supports_credentials=True)解决问题