我正在使用 React + Redux 开发一个应用程序，并且我在 Firebase 数据库中有我的 JSON 数据库。
为此，我尝试从有效的 URL(从 Firebase 模拟器验证)获取我的数据
let firebase = 'https://******.firebaseio.com/**/*/***/*'
return (dispatch) => {
return fetch(firebase)
.then(res => res.json())
.then(json => dispatch({ type: 'GET_JSON', payload: json }))
}
这会给我返回错误:
Fetch API cannot load https://console.firebase.google.com/project/****/database/data/**/*/***/*. Redirect from 'https://console.firebase.google.com/project//database/data/**///' to 'https://accounts.google.com/ServiceLogin?ltmpl=firebase&osid=1&passive=true…ole.firebase.google.com/project//database/data///**/' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.`
我尝试了很多解决方案，比如添加到 fetch 的第二个参数 { mode: 'no-cors', credentials: 'same-origin'}，但是当我尝试这个时我得到了 未捕获( promise )语法错误:输入意外结束。
我错过了什么？
最佳答案
likely error that arise to cors blocked when using firebase is
when you initiate a put or get request with an incomplete firebase url
e.g
// wrong form
this.http.get('https://******.firebaseio.com/data') //this will throw an exception
// correct form
this.http.get('https://******.firebaseio.com/data.json')
关于javascript - Firebase Fetch - 没有访问控制允许来源，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40081984/