React Native Javascript 异常答案

【问题标题】：React Native Javascript exceptionsReact Native Javascript 异常
【发布时间】：2017-07-28 11:29:29
【问题描述】：

我在商店中有一个 Android React Native 应用程序，最近在应用程序的统计信息中，我可以看到一些 JavaScript 异常，并且提供了一些错误代码。我已经阅读了一些东西来告诉我代码中的错误在哪里，或者这个错误何时向最终用户弹出但无法找到解决方案。知道如何解决这个问题或这段文字的含义吗？

com.facebook.react.common.JavascriptException: null is not an object (evaluating 'n._currentElement'), stack:
_updateRenderedComponent@139:6700
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
performUpdateIfNecessary@139:5029
performUpdateIfNecessary@130:963
s@126:940
perform@134:617
perform@134:617
perform@126:2082
k@126:2254
closeAll@134:1270
perform@134:704
batchedUpdates@210:485
o@126:412
_receiveRootNodeIDEvent@117:647
receiveEvent@117:757
value@30:2778
<unknown>@30:1013
<unknown>@30:106
value@30:985
at com.facebook.react.modules.core.ExceptionsManagerModule.showOrThrowError(ExceptionsManagerModule.java
  at com.facebook.react.modules.core.ExceptionsManagerModule.reportFatalException (ExceptionsManagerModule.java:83)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.facebook.react.bridge.BaseJavaModule$JavaMethod.invoke (BaseJavaModule.java:345)
  at com.facebook.react.cxxbridge.JavaModuleWrapper.invoke (JavaModuleWrapper.java:136)
  at com.facebook.react.bridge.queue.NativeRunnable.run (Native Method)
  at android.os.Handler.handleCallback (Handler.java:751)
  at android.os.Handler.dispatchMessage (Handler.java:95)
  at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage (MessageQueueThreadHandler.java:31)
  at android.os.Looper.loop (Looper.java:154)
  at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run (MessageQueueThreadImpl.java:196)
  at java.lang.Thread.run (Thread.java:762)

我得到的第二个错误是这个：

com.facebook.react.common.JavascriptException: null is not an object (evaluating 'e.getHostNode'), stack:
getHostNode@130:343
getHostNode@139:3247
getHostNode@130:355
updateChildren@137:515
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
updateChildren@137:471
_reconcilerUpdateChildren@135:955
_updateChildren@135:1807
updateChildren@135:1695
receiveComponent@115:817
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
receiveComponent@139:4813
receiveComponent@130:601
_updateRenderedComponent@139:6780
_performComponentUpdate@139:6549
updateComponent@139:5788
performUpdateIfNecessary@139:5029
performUpdateIfNecessary@130:963
s@126:940
perform@134:617
perform@134:617
perform@126:2082
k@126:2254
closeAll@134:1270
perform@134:704
batchedUpdates@210:485
o@126:412
_receiveRootNodeIDEvent@117:647
receiveTouches@117:1021
value@30:2778
<unknown>@30:1013
<unknown>@30:106
value@30:985
at com.facebook.react.modules.core.ExceptionsManagerModule.showOrThrowError(ExceptionsManagerModule.java
  at com.facebook.react.modules.core.ExceptionsManagerModule.reportFatalException (ExceptionsManagerModule.java:83)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.facebook.react.bridge.BaseJavaModule$JavaMethod.invoke (BaseJavaModule.java:345)
  at com.facebook.react.cxxbridge.JavaModuleWrapper.invoke (JavaModuleWrapper.java:136)
  at com.facebook.react.bridge.queue.NativeRunnable.run (Native Method)
  at android.os.Handler.handleCallback (Handler.java:751)
  at android.os.Handler.dispatchMessage (Handler.java:95)
  at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage (MessageQueueThreadHandler.java:31)
  at android.os.Looper.loop (Looper.java:154)
  at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run (MessageQueueThreadImpl.java:196)
  at java.lang.Thread.run (Thread.java:762)

【问题讨论】：

代码在哪里？
商店没有告诉我错误在哪里，我得到的只是我已经放的东西。应用的代码太长了，全部放在这里。
我也经历了第二个。不知道是什么原因造成的。

标签： javascript android reactjs react-native native

【解决方案1】：

没有代码我几乎无法回答，但这是我的猜测：

错误是说变量未填充或（尚）不存在，而您的代码在某处要求它。尝试查找'n._currentElement'和'e.getHostNode'，我建议使用Cmd/Ctrl + F。如果你能找到这些变量的使用位置，也许你也可以找出错误产生的位置。

祝你好运！

【讨论】：