在devtool控制台中，同样的访问允许控制源错误，我找到了其他具有更现代语法的解决方案:

我的CORS问题是存储(不是RTDB也不是浏览器…)，然后我没有信用卡(正如上述解决方案所要求的那样)，我的无信用卡解决方案是:

安装gsutil: https://cloud.google.com/storage/docs/gsutil_install#linux-and-macos 创建cors。Json文件通过终端加载与gsutil

gsutil cors set cors.json gs://[ your-bucket ]/-1.appspot.com

https://firebase.google.com/docs/storage/web/download-files#cors_configuration

Firebase v2的云功能

Firebase v2的云函数现在允许您直接在HTTP选项中配置cors。它的工作不需要任何第三方软件包:

import { https } from 'firebase-functions/v2';

export myfunction = https.onRequest({ cors: true }, async (req, res) => {
  // this will be invoked for any request, regardless of its origin
});

请注意:

在撰写本文时，v2正在公开预览中。 目前v2中只支持区域的一个子集。 函数名被限制为小写字母、数字和破折号。 你可以在一个代码库中同时使用v1和v2函数。为了提高可读性，请更新导入以分别访问firebase-functions/v1或firebase-functions/v2。

没有CORS解决方案对我有效…直到现在!

Not sure if anyone else ran into the same issue I did, but I set up CORS like 5 different ways from examples I found and nothing seemed to work. I set up a minimal example with Plunker to see if it was really a bug, but the example ran beautifully. I decided to check the firebase functions logs (found in the firebase console) to see if that could tell me anything. I had a couple errors in my node server code, not CORS related, that when I debugged released me of my CORS error message. I don't know why code errors unrelated to CORS returns a CORS error response, but it led me down the wrong rabbit hole for a good number of hours...

dr -如果没有CORS解决方案工作，检查您的firebase函数日志并调试任何错误

如果您不使用Express或只想使用CORS。下面的代码将帮助解决这个问题

const cors = require('cors')({ origin: true, });   
exports.yourfunction = functions.https.onRequest((request, response) => {  
   return cors(request, response, () => {  
        // *Your code*
    });
});

通过这么多的搜索，我可以在相同的firebase文档中找到这个解决方案，只是在路径中实现cors:

import * as express from "express";
import * as cors from "cors";


const api = express();
api.use(cors({ origin: true }));
api.get("/url", function);

链接firebase文档:https://firebase.google.com/docs/functions/http-events

只有这种方式对我有效，因为我在我的请求中有授权:

exports.hello = functions.https.onRequest((request, response) => {
response.set('Access-Control-Allow-Origin', '*');
response.set('Access-Control-Allow-Credentials', 'true'); // vital
if (request.method === 'OPTIONS') {
    // Send response to OPTIONS requests
    response.set('Access-Control-Allow-Methods', 'GET');
    response.set('Access-Control-Allow-Headers', 'Content-Type');
    response.set('Access-Control-Max-Age', '3600');
    response.status(204).send('');
} else {
    const params = request.body;
    const html = 'some html';
    response.send(html)
} )};