如何访问 Javascript 文件中 Flask 路由的 return 值？

Question

我遇到的问题是在 flask 路由 (resp["login"]) 中访问 return 语句中的值。我试图在 javascript 文件中使用此值并将其用作查询参数。但是每当我在 javascript 文件中尝试 console.log() 时，我都会得到一个 promise 对象。但是我找不到在哪里可以找到 Flask 应用程序的价值。我以为它会在下面的响应对象中，但没有这样的运气。

@app.route('/route', methods=['GET', 'POST'])
@cross_origin(supports_credentials=True)
def handle_callback():

    if request.method == 'POST':

        payload = {
            blahhh
        }
        headers = {'Accept': 'application/json', 'Access-Control-Allow-Origin': '*'}
        req = requests.post(token_url, params=payload, headers=headers)
        # make another request after this using access token with updated header field 
        resp = req.json()

        if 'access_token' in resp:
            oauthHeader = "token " + resp['blahhh']
            headers = {'Authorization': oauthHeader}
            access_token_url = 'https://blahhh.com'
            r = requests.get(url=access_token_url, headers=headers)
            resp = r.json()
            return resp["login"]
        else:
            return "error", 404

const queryString = window.location.search;
const urlParams = new URLSearchParams(queryString);
const codeGit = urlParams.get('code')

const sub = {codeGit};
 

const res = fetch('http://localhost:4000/route', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json',
        'Access-Control-Allow-Origin': '*',
        'code': codeGit
    },
    credentials: 'include'
}).then(response => {
    if(response.status == 200){
        console.log('Success! ' + response.json() )
    }
}).catch(error => {
    console.log('error with access token req!')
})

console.log(res)

Answer 1

response.json()return一个承诺

Return value: A Promise that resolves to a JavaScript object. This object could be anything that can be represented by JSON — an object, an array, a string, a number...

.then(response => {
    if(response.status == 200){
        return response.json();
    } else {
        // handle this somehow
    }
}).then(json => {
    console.log('Success! ' + JSON.stringify(json))
}).catch(error => {
    console.log('error with access token req!')
})

如何访问 Javascript 文件中 Flask 路由的 return 值？

How can I access the return value of a Flask route within a Javascript file?

javascript

fetch-api