Javascript cors发布后的云功能

发送请求时获取cors错误，但在邮递员中工作

错误消息：

从源（我的web应用）获取（云函数url）的访问权限已被取消 已被CORS策略阻止：没有“访问控制允许来源”标题 请求的资源上存在。如果一个不透明的回应有效 根据您的需要，将请求的模式设置为“no cors”以获取资源 CORS被禁用

云功能代码：

exports.add_edit_location_routes = functions.https.onRequest((request, response) => {
    let obj = request.body
    deletePreviousRoutes(obj.assign_route_id, obj.driver_id, () => addRoutes(obj, (msg) => {
        response.send(msg)
    }))
})

请求：

fetch("url", {
    body: JSON.stringify(json),
    method: "POST",
    headers: {'Content-Type': 'application/json'},
}).then(res => res.json()).then(obj => console.log(obj))

添加了这个，但仍然不起作用

res.set('Access-Control-Allow-Origin', '*')

---

尝试将您提供的代码包含在云函数中，而不是包含获取请求

exports.add_edit_location_routes = functions.https.onRequest((request, response) => {
  let obj = request.body
  response.set('Access-Control-Allow-Origin', '*')
  deletePreviousRoutes(obj.assign_route_id, obj.driver_id, () => addRoutes(obj, (msg) => {
      response.send(msg)
  }))
})

---

尝试将您提供的代码包含在云函数中，而不是包含获取请求

exports.add_edit_location_routes = functions.https.onRequest((request, response) => {
  let obj = request.body
  response.set('Access-Control-Allow-Origin', '*')
  deletePreviousRoutes(obj.assign_route_id, obj.driver_id, () => addRoutes(obj, (msg) => {
      response.send(msg)
  }))
})