Question

我有几个小时的奇怪错误，真的无法弄清楚它是什么。该应用程序工作正常，然后在我更改了页面标题的名称后给了我这个错误。

TypeError：null不是对象（评估'todo._id'）

此错误位于：

in TodoList (created by Connect(TodoList))
in Connect(TodoList) (at NavigatorIOS.ios.js:862)
in RCTNavItem (at NavigatorIOS.ios.js:854)
in StaticContainer (at NavigatorIOS.ios.js:853)
in RCTNavigator (at NavigatorIOS.ios.js:52)
in NavigatorTransitionerIOS (at NavigatorIOS.ios.js:882)
in StaticContainer (at NavigatorIOS.ios.js:881)
in RCTView (at View.js:78)
in View (at NavigatorIOS.ios.js:917)
in NavigatorIOS (at Main.js:26)
in Main (at App.js:25)
in RCTView (at View.js:78)
in View (at App.js:34)
in App (created by Connect(App))
in Connect(App) (at App.js:12)
in Provider (at App.js:11)
in todoListAuth (at registerRootComponent.js:35)
in RootErrorBoundary (at registerRootComponent.js:34)
in ExpoRootComponent (at renderApplication.js:35)
in RCTView (at View.js:78)
in View (at AppContainer.js:102)
in RCTView (at View.js:78)
in View (at AppContainer.js:122)
in AppContainer (at renderApplication.js:34)

app / components / TodoList.js：74：30 in
app / components / TodoList.js：在renderTodos中使用72:34
app / components / TodoList.js：99：11 TodoList_render
在finishClassComponent中的node_modules / react-native / Libraries / Renderer / ReactNativeRenderer-dev.js：8707：21
node_modules / react-native / Libraries / Renderer / ReactNativeRenderer-dev.js：11771：25 in performUnitOfWork
...来自框架内部的22个堆栈框架

从那时起，我试图以某种方式修复它甚至从昨天获得回购，但同样的事情却没有改变一切。那是REDx包的东西吗？

由于

修改

代码我已经改变了

<View style={styles.container}>
    <View style={styles.topBar}>
      <TouchableOpacity onPress={this.onBack}>
        <Icon name="chevron-left" size={20} color="white"/>
      </TouchableOpacity>
      <Text style={styles.title}>
        New To-Do // This is the text I've changed
      </Text>
      <TouchableOpacity onPress={this.addNewTodo}>
        <Icon name="check" size={20} color="white"/>
      </TouchableOpacity>
    </View>

错误行

var renderTodos = () => {
  return this.props.todos.map((todo) => { // Line 72
    return (
      <TodoItem key={todo._id} text={todo.text} id={todo._id}/> // Line 74
    )
  })
}
{renderTodos()} // Line 99

redux的错误突然

0 个答案: