Javascript React native:未处理的承诺拒绝：TypeError:undefined不是对象

不幸的是，我对代码有一个经典的“现在只有上帝知道”的时刻（或者因为它是由我的团队成员编写的）。 我返回到一个项目，已经搁置了相当长的一段时间，现在在返回，并试图更新一些软件包等。我得到一些恼人的错误

现在，当我尝试运行我的React原生项目时，最主要的问题是：

* http://blurred-IP/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:150165:37 in _callee$
- node_modules/regenerator-runtime/runtime.js:45:44 in tryCatch
- node_modules/regenerator-runtime/runtime.js:271:30 in invoke
- node_modules/regenerator-runtime/runtime.js:45:44 in tryCatch
- node_modules/regenerator-runtime/runtime.js:135:28 in invoke
- node_modules/regenerator-runtime/runtime.js:170:17 in Promise$argument_0
- node_modules/promise/setimmediate/core.js:45:7 in tryCallTwo
- node_modules/promise/setimmediate/core.js:200:23 in doResolve
- node_modules/promise/setimmediate/core.js:66:12 in Promise
- node_modules/regenerator-runtime/runtime.js:169:27 in Promise$argument_0
- node_modules/regenerator-runtime/runtime.js:192:38 in enqueue
- node_modules/regenerator-runtime/runtime.js:216:8 in exports.async
* src/screens/main/DashBoard.js:150:18 in splitServices
* http:blurred-IP/node_modules/expo/AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false:150661:69 in fetchEverything$
- node_modules/regenerator-runtime/runtime.js:45:44 in tryCatch
- node_modules/regenerator-runtime/runtime.js:271:30 in invoke
- node_modules/regenerator-runtime/runtime.js:45:44 in tryCatch
- node_modules/regenerator-runtime/runtime.js:135:28 in invoke
- node_modules/regenerator-runtime/runtime.js:145:19 in Promise.resolve.then$argument_0
- node_modules/promise/setimmediate/core.js:37:14 in tryCallOne
- node_modules/promise/setimmediate/core.js:123:25 in setImmediate$argument_0
- node_modules/react-native/Libraries/Core/Timers/JSTimers.js:146:14 in _callTimer
- node_modules/react-native/Libraries/Core/Timers/JSTimers.js:194:17 in _callImmediatesPass
- node_modules/react-native/Libraries/Core/Timers/JSTimers.js:458:30 in callImmediates
* [native code]:null in callImmediates
- node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:407:6 in __callImmediates
- node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:143:6 in __guard$argument_0
- node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:384:10 in __guard
- node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:142:17 in __guard$argument_0
* [native code]:null in flushedQueue
* [native code]:null in invokeCallbackAndReturnFlushedQueue

据我所知，问题应该出现在DashBoard.js文件的第150行。 该行及其周围的代码：

async fetchEverything（）{
const services=await NetworkingService.fetchActiveServices（）
const events=await NetworkingService.fetchAllEvents（）
const things=wait NetworkingService.fetchAllThings（）
const splitservices=等待此消息。splitservices（服务）
等待此消息。setstatesync({
eventData:events.events，
requestData:splitservices.requests，
offerData:splitservices.offers，
thingData:things.data.things，
})
this.createRenders（）
}
splitServices=async（服务）=>{
const list=services.services
常量请求=[]
const offers=[]
for（设i=0；i

列表可能是空的？空着

---

任何帮助都将不胜感激

将变量值从undefined更改为{}（空对象）应该可以工作，如果这个问题不久前解决了的话

编辑：

---

或者[]

我猜当您尝试访问

服务时，
服务
未定义。服务

。我想您需要检查

NetworkingService.fetchActiveServices（）

是否返回有效响应。可能在这里，请尝试const list=services.services？？[]并在调用函数之前声明函数