flask跨域

from flask import Flask
from flask_cors import CORS, cross_origin

app = Flask(__name__)
CORS(app)

@app.route("/")
def helloWorld():
  return "Hello, cross-origin-world!"

from functools import wraps
from flask import make_response
一：
@app.route('/result', methods=['GET', 'POST'])
def index():
    file_object = open('/home/pyspark_project/pyspark_output_result.json')
    try:
        result_text = file_object.read()
    finally:
        file_object.close()
    #
    rst = make_response(result_text)
    rst.headers['Access-Control-Allow-Origin'] = '*'

    return rst, 201
    

from flask import Flask, request
import json

app = Flask(__name__)

@app.route('/')
def func():
    res = {
        'data': {
            'data1': [],
            'data2': []
        }
    }

    callback = request.values.get('callback')
    return ''.join([
        callback,
        '(',
        json.dumps(res),
        ');'
    ])

if __name__ == '__main__':
    cfg = {
        'host': '0.0.0.0',
        'port': 1234,
        'debug': True
    }
    '''
    // javascript code:
    $.ajax({
        url: "http://localhost:1234/",
        dataType: "jsonp",
        data: {},
        success: function(res) {
            console.log(res);
        }
    });'''
    app.run(**cfg)