Javascript 不能'；在react native中找不到导航对象错误

这是我第一次使用react native，我想移动到另一个屏幕（幻灯片2），我有一个错误，上面写着“我们找不到导航对象。你的组件在导航器中吗？”他们说错误在幻灯片1中，我有点卡住了，这就是我已经走了多远。 也请解释一点将非常感谢，并告诉我要添加什么和在哪里，谢谢

slideOne.js页面代码

import 'react-native-gesture-handler';
import {NavigationContainer} from '@react-navigation/native';
import {createStackNavigator} from '@react-navigation/stack';
import React from 'react';
import {useNavigation} from '@react-navigation/native';
import SlideTwo from './SlideTwo';

import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
  TextInput,
  Button,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

function SlideOne() {
const navigation = useNavigation();
  return (
    <React.Fragment>
      <View style={styles.body}>
        <View style={styles.wrapper}>
          <View style={styles.imageWrap}></View>

          <TextInput
            placeholder="What should we refer to you as?"
            placeholderTextColor="#03444F60"
            style={styles.textInput}
            underlineColorAndroid="transparent"
          />
        </View>
        <View style={styles.label}>
          <Text style={styles.labelText}>First Name</Text>
        </View>

        <View style={styles.textWrap}>
          <Text style={styles.text}>Back</Text>
          <Text style={styles.text}>Next</Text>
        </View>
        <Button
          title="Go to screen two"
          onPress={() => navigation.navigate('SlideTwo')}
        />
      </View>
    </React.Fragment>
  );
}
export default SlideOne;

import React from 'react';
import {createStackNavigator} from '@react-navigation/stack';
import {NavigationContainer} from '@react-navigation/native';

import SlideOne from './SlideOne';
import SlideTwo from './SlideTwo';

// NAVIGATION
const StackNavigator = createStackNavigator();

function App() {
  <NavigationContainer>
    <StackNavigator.Navigator>
      <StackNavigator.Screen name="SlideOne" component={SlideOne} />
      <StackNavigator.Screen name="SlideTwo" component={SlideTwo} />
    </StackNavigator.Navigator>
  </NavigationContainer>;
}

export default App;

app.js代码

import 'react-native-gesture-handler';
import {NavigationContainer} from '@react-navigation/native';
import {createStackNavigator} from '@react-navigation/stack';
import React from 'react';
import {useNavigation} from '@react-navigation/native';
import SlideTwo from './SlideTwo';

import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
  TextInput,
  Button,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

function SlideOne() {
const navigation = useNavigation();
  return (
    <React.Fragment>
      <View style={styles.body}>
        <View style={styles.wrapper}>
          <View style={styles.imageWrap}></View>

          <TextInput
            placeholder="What should we refer to you as?"
            placeholderTextColor="#03444F60"
            style={styles.textInput}
            underlineColorAndroid="transparent"
          />
        </View>
        <View style={styles.label}>
          <Text style={styles.labelText}>First Name</Text>
        </View>

        <View style={styles.textWrap}>
          <Text style={styles.text}>Back</Text>
          <Text style={styles.text}>Next</Text>
        </View>
        <Button
          title="Go to screen two"
          onPress={() => navigation.navigate('SlideTwo')}
        />
      </View>
    </React.Fragment>
  );
}
export default SlideOne;

import React from 'react';
import {createStackNavigator} from '@react-navigation/stack';
import {NavigationContainer} from '@react-navigation/native';

import SlideOne from './SlideOne';
import SlideTwo from './SlideTwo';

// NAVIGATION
const StackNavigator = createStackNavigator();

function App() {
  <NavigationContainer>
    <StackNavigator.Navigator>
      <StackNavigator.Screen name="SlideOne" component={SlideOne} />
      <StackNavigator.Screen name="SlideTwo" component={SlideTwo} />
    </StackNavigator.Navigator>
  </NavigationContainer>;
}

export default App;

从“React”导入React；
从'@react navigation/stack'导入{createStackNavigator}；
从'@react-navigation/native'导入{NavigationContainer}；
从“/SlideOne”导入SlideOne；
从“/slidewo”导入slidewo；
//航行
const StackNavigator=createStackNavigator（）；
函数App（）{
;
}
导出默认应用程序；

问题出在index.js中，您使用的是注册SlideOne组件，这不是必需的。您应该像下面那样注册应用程序组件

AppRegistry.registerComponent(appName, () => App);

现在错误出现在您的组件上，而SlideOne不在导航器中，这是真的。当您运行应用程序时，您会跳过该应用程序并直接呈现未连接到任何导航器的SlideOne组件，因此当您尝试导航时，最终会出现错误

当你使用你的应用程序组件时，你会呈现一个导航器中的SlideOne组件，这样它就可以正常工作了