flask中的跨域处理-方法二不使用第三方库

方法1（第三方库）

pip install flask-cors

from flask import Flask
from flask_cors import CORS

app = Flask(__name__)
CORS(app, resources={r"/api/*": {"origins": ["http://localhost:63342", "http://localhost:63345"]}})
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方法2（声明周期函数）

from flask import Flask, jsonify, request, make_response

# 创建Flask应用程序实例
app = Flask(__name__)
origins = ["http://localhost:63342", "http://localhost:63345"]


# 定义路由和视图函数
@app.route('/api/object', methods=["get", "post"])
def hello_world():
    loginWay = request.args.get("loginWay")

    username = ""
    if loginWay == "sms":
        mobile = request.json.get("mobile")
        code = request.json.get("code")
        if mobile != "153" or code != "123":
            return jsonify(code=-1, msg="短信验证码错误或已过期")
    elif loginWay == "password":
        username = request.json.get("username")
        password = request.json.get("password")
        if username != "myn" or password != "149":
            return jsonify(code=-1, msg="用户名或密码错误")
    data = {"account": username if username else mobile, "loginWay": loginWay, "msg": "登录成功"}
    return jsonify(code=0, msg="登录成功", data=data)


@app.after_request
def app_after_request(response):
    current_origin = request.headers.get("Origin")
    response.headers['Access-Control-Allow-Origin'] = current_origin
    return response


@app.before_request
def app_before_request():
    if request.method == "OPTIONS" and request.headers.get("Origin") in origins:
        resp = make_response()
        resp.headers.add('Access-Control-Allow-Credentials', 'true')
        resp.headers.add('Access-Control-Allow-Methods', 'GET,POST,OPTIONS')
        resp.headers.add('Access-Control-Allow-Headers',
                         "Content-Type,X-Requested-With,X-Csrf-Token,DNT,X-CustomHeader,"
                         "Keep-Alive,User-Agent,If-Modified-Since,Cache-Control,Authorization")
        return resp

# 启动应用程序
if __name__ == '__main__':
    app.run(debug=True)

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