Javascript undefined不是本机对象

我不知道为什么我会这样

“undefined不是对象（正在评估） “\u this.props.navigation.navigate”）”

我是react的新手，但我已经经历了每一个可能的解决方案，但仍然犯了这个错误。我在下面分享我的代码：

App.js

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import Login from './app/components/Login/Login';
import Dashboard from './app/components/Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

const Application = StackNavigator({
        Home: { screen: Login },
        Dashboard: { screen: Dashboard },
    }, {
        navigationOptions: {
            header: false
        }
});

export default class App extends React.Component {
  render() {
    return (
        <Application />
    );
  }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
    },
});

import React from 'react';
import { StyleSheet, View, Image, Text, TextInput, KeyboardAvoidingView } from 'react-native';
import LoginForm from './LoginForm';
import {StackNavigator} from 'react-navigation';

export default class Login extends React.Component {

    render() {
        return (
            <KeyboardAvoidingView behavior='padding' style={styles.container}>
                <View style={styles.logoContainer}>
                    <Image source={require('../../images/logo.png')}
                           style={styles.logo}
                    />
                </View>
                <Text style={styles.title}>Share Emotions Instantly..</Text>
                <View style={styles.formContainer}>
                    <LoginForm></LoginForm>
                </View>
            </KeyboardAvoidingView>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#bdc3c7',
        alignItems: 'center',
        justifyContent: 'center',
    },

    logoContainer: {
        alignItems: 'center',
        justifyContent: 'center'
    },

    logo: {
        width: 70,
        height: 70
    }
});

import React from 'react';
import { StyleSheet, View, TextInput, TouchableOpacity, Text, Alert } from 'react-native';
import Dashboard from '../Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

export default class LoginForm extends React.Component {

    constructor(props) {
        super(props);
    }

    onButtonPress = () => {
        alert('ok');
        const { navigate } = this.props.navigation;
        navigate('Dashboard');
    }

    render() {
        return (
            <View style={styles.container}>
                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="username or email" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType="next"
                           keyboardType="email-address"
                           autoCapitalize="none"
                           autoCorrect={false}
                           onSubmitEditing={() => this.passwordInput.focus()}>
                </TextInput>

                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="password" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType='go'
                           ref={(input) => this.passwordInput = input}
                           secureTextEntry> 
                </TextInput>

                <TouchableOpacity style={styles.buttonContainer}
                                  onPress={this.onButtonPress}>
                    <Text style={styles.buttonText}>Login</Text>
                </TouchableOpacity>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        padding: 20
    },

    input: {
        height: 40,
        marginBottom: 15,
        backgroundColor: 'rgba(255,255,255,0.2)',
        paddingHorizontal: 10,
        width: 300
    },

    buttonContainer: {
        backgroundColor: '#888',
        paddingVertical: 10
    },

    buttonText: {
        textAlign: 'center',
        color: '#fff',
        fontWeight: '700'
    }
});

import React from 'react';
import { StyleSheet, View } from 'react-native';
import {StackNavigator} from 'react-navigation';

export default class Dashboard extends React.Component {
    render() {
        return (
            <View style={styles.container}>
                <Text>this is Dashboard</Text>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1
    }
});

从“React”导入React；
从“react native”导入{样式表、文本、视图}；
从“./app/components/Login/Login”导入登录名；
从“./app/components/Dashboard/Dashboard”导入仪表板；
从“react navigation”导入{StackNavigator}；
const Application=StackNavigator({
主页：{屏幕：登录}，
仪表板：{屏幕：仪表板}，
}, {
导航选项：{
标题：false
}
});
导出默认类App扩展React.Component{
render（）{
返回(
);
}
}
const styles=StyleSheet.create({
容器：{
弹性：1，
对齐项目：“居中”，
为内容辩护：“中心”，
},
});

Login.js

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import Login from './app/components/Login/Login';
import Dashboard from './app/components/Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

const Application = StackNavigator({
        Home: { screen: Login },
        Dashboard: { screen: Dashboard },
    }, {
        navigationOptions: {
            header: false
        }
});

export default class App extends React.Component {
  render() {
    return (
        <Application />
    );
  }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
    },
});

import React from 'react';
import { StyleSheet, View, Image, Text, TextInput, KeyboardAvoidingView } from 'react-native';
import LoginForm from './LoginForm';
import {StackNavigator} from 'react-navigation';

export default class Login extends React.Component {

    render() {
        return (
            <KeyboardAvoidingView behavior='padding' style={styles.container}>
                <View style={styles.logoContainer}>
                    <Image source={require('../../images/logo.png')}
                           style={styles.logo}
                    />
                </View>
                <Text style={styles.title}>Share Emotions Instantly..</Text>
                <View style={styles.formContainer}>
                    <LoginForm></LoginForm>
                </View>
            </KeyboardAvoidingView>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#bdc3c7',
        alignItems: 'center',
        justifyContent: 'center',
    },

    logoContainer: {
        alignItems: 'center',
        justifyContent: 'center'
    },

    logo: {
        width: 70,
        height: 70
    }
});

import React from 'react';
import { StyleSheet, View, TextInput, TouchableOpacity, Text, Alert } from 'react-native';
import Dashboard from '../Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

export default class LoginForm extends React.Component {

    constructor(props) {
        super(props);
    }

    onButtonPress = () => {
        alert('ok');
        const { navigate } = this.props.navigation;
        navigate('Dashboard');
    }

    render() {
        return (
            <View style={styles.container}>
                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="username or email" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType="next"
                           keyboardType="email-address"
                           autoCapitalize="none"
                           autoCorrect={false}
                           onSubmitEditing={() => this.passwordInput.focus()}>
                </TextInput>

                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="password" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType='go'
                           ref={(input) => this.passwordInput = input}
                           secureTextEntry> 
                </TextInput>

                <TouchableOpacity style={styles.buttonContainer}
                                  onPress={this.onButtonPress}>
                    <Text style={styles.buttonText}>Login</Text>
                </TouchableOpacity>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        padding: 20
    },

    input: {
        height: 40,
        marginBottom: 15,
        backgroundColor: 'rgba(255,255,255,0.2)',
        paddingHorizontal: 10,
        width: 300
    },

    buttonContainer: {
        backgroundColor: '#888',
        paddingVertical: 10
    },

    buttonText: {
        textAlign: 'center',
        color: '#fff',
        fontWeight: '700'
    }
});

import React from 'react';
import { StyleSheet, View } from 'react-native';
import {StackNavigator} from 'react-navigation';

export default class Dashboard extends React.Component {
    render() {
        return (
            <View style={styles.container}>
                <Text>this is Dashboard</Text>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1
    }
});

从“React”导入React；
从“react native”导入{样式表、视图、图像、文本、文本输入、键盘AVOIDGVIEW}；
从“/LoginForm”导入LoginForm；
从“react navigation”导入{StackNavigator}；
导出默认类登录扩展React.Component{
render（）{
返回(
立即分享情感。。
);
}
}
const styles=StyleSheet.create({
容器：{
弹性：1，
背景颜色：“#bdc3c7”，
对齐项目：“居中”，
为内容辩护：“中心”，
},
标识容器：{
对齐项目：“居中”，
为内容辩护：“中心”
},
标志：{
宽度：70，
身高：70
}
});

LoginForm.js

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import Login from './app/components/Login/Login';
import Dashboard from './app/components/Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

const Application = StackNavigator({
        Home: { screen: Login },
        Dashboard: { screen: Dashboard },
    }, {
        navigationOptions: {
            header: false
        }
});

export default class App extends React.Component {
  render() {
    return (
        <Application />
    );
  }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
    },
});

import React from 'react';
import { StyleSheet, View, Image, Text, TextInput, KeyboardAvoidingView } from 'react-native';
import LoginForm from './LoginForm';
import {StackNavigator} from 'react-navigation';

export default class Login extends React.Component {

    render() {
        return (
            <KeyboardAvoidingView behavior='padding' style={styles.container}>
                <View style={styles.logoContainer}>
                    <Image source={require('../../images/logo.png')}
                           style={styles.logo}
                    />
                </View>
                <Text style={styles.title}>Share Emotions Instantly..</Text>
                <View style={styles.formContainer}>
                    <LoginForm></LoginForm>
                </View>
            </KeyboardAvoidingView>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#bdc3c7',
        alignItems: 'center',
        justifyContent: 'center',
    },

    logoContainer: {
        alignItems: 'center',
        justifyContent: 'center'
    },

    logo: {
        width: 70,
        height: 70
    }
});

import React from 'react';
import { StyleSheet, View, TextInput, TouchableOpacity, Text, Alert } from 'react-native';
import Dashboard from '../Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

export default class LoginForm extends React.Component {

    constructor(props) {
        super(props);
    }

    onButtonPress = () => {
        alert('ok');
        const { navigate } = this.props.navigation;
        navigate('Dashboard');
    }

    render() {
        return (
            <View style={styles.container}>
                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="username or email" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType="next"
                           keyboardType="email-address"
                           autoCapitalize="none"
                           autoCorrect={false}
                           onSubmitEditing={() => this.passwordInput.focus()}>
                </TextInput>

                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="password" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType='go'
                           ref={(input) => this.passwordInput = input}
                           secureTextEntry> 
                </TextInput>

                <TouchableOpacity style={styles.buttonContainer}
                                  onPress={this.onButtonPress}>
                    <Text style={styles.buttonText}>Login</Text>
                </TouchableOpacity>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        padding: 20
    },

    input: {
        height: 40,
        marginBottom: 15,
        backgroundColor: 'rgba(255,255,255,0.2)',
        paddingHorizontal: 10,
        width: 300
    },

    buttonContainer: {
        backgroundColor: '#888',
        paddingVertical: 10
    },

    buttonText: {
        textAlign: 'center',
        color: '#fff',
        fontWeight: '700'
    }
});

import React from 'react';
import { StyleSheet, View } from 'react-native';
import {StackNavigator} from 'react-navigation';

export default class Dashboard extends React.Component {
    render() {
        return (
            <View style={styles.container}>
                <Text>this is Dashboard</Text>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1
    }
});

从“React”导入React；
从“react native”导入{样式表、视图、文本输入、TouchableOpacity、文本、警报}；
从“../Dashboard/Dashboard”导入仪表板；
从“react navigation”导入{StackNavigator}；
导出默认类LoginForm扩展React.Component{
建造师（道具）{
超级（道具）；
}
onButtonPress=（）=>{
警报（“正常”）；
const{navigate}=this.props.navigation；
导航（“仪表板”）；
}
render（）{
返回(
this.passwordInput.focus（）}>
this.passwordInput=input}
secureTextEntry>
登录
);
}
}
const styles=StyleSheet.create({
容器：{
填充：20
},
输入：{
身高：40，
marginBottom:15，
背景颜色：“rgba（255255,0.2）”，
水平方向：10，
宽度：300
},
按钮容器：{
背景颜色：“#888”，
填充垂直：10
},
按钮文字：{
textAlign:'中心'，
颜色：“#fff”，
重量：'700'
}
});

Dashboard.js

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import Login from './app/components/Login/Login';
import Dashboard from './app/components/Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

const Application = StackNavigator({
        Home: { screen: Login },
        Dashboard: { screen: Dashboard },
    }, {
        navigationOptions: {
            header: false
        }
});

export default class App extends React.Component {
  render() {
    return (
        <Application />
    );
  }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
    },
});

import React from 'react';
import { StyleSheet, View, Image, Text, TextInput, KeyboardAvoidingView } from 'react-native';
import LoginForm from './LoginForm';
import {StackNavigator} from 'react-navigation';

export default class Login extends React.Component {

    render() {
        return (
            <KeyboardAvoidingView behavior='padding' style={styles.container}>
                <View style={styles.logoContainer}>
                    <Image source={require('../../images/logo.png')}
                           style={styles.logo}
                    />
                </View>
                <Text style={styles.title}>Share Emotions Instantly..</Text>
                <View style={styles.formContainer}>
                    <LoginForm></LoginForm>
                </View>
            </KeyboardAvoidingView>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#bdc3c7',
        alignItems: 'center',
        justifyContent: 'center',
    },

    logoContainer: {
        alignItems: 'center',
        justifyContent: 'center'
    },

    logo: {
        width: 70,
        height: 70
    }
});

import React from 'react';
import { StyleSheet, View, TextInput, TouchableOpacity, Text, Alert } from 'react-native';
import Dashboard from '../Dashboard/Dashboard';
import {StackNavigator} from 'react-navigation';

export default class LoginForm extends React.Component {

    constructor(props) {
        super(props);
    }

    onButtonPress = () => {
        alert('ok');
        const { navigate } = this.props.navigation;
        navigate('Dashboard');
    }

    render() {
        return (
            <View style={styles.container}>
                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="username or email" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType="next"
                           keyboardType="email-address"
                           autoCapitalize="none"
                           autoCorrect={false}
                           onSubmitEditing={() => this.passwordInput.focus()}>
                </TextInput>

                <TextInput underlineColorAndroid="transparent" 
                           style={styles.input} 
                           placeholder="password" 
                           placeholderTextColor='rgba(255,255,255,0.5)'
                           returnKeyType='go'
                           ref={(input) => this.passwordInput = input}
                           secureTextEntry> 
                </TextInput>

                <TouchableOpacity style={styles.buttonContainer}
                                  onPress={this.onButtonPress}>
                    <Text style={styles.buttonText}>Login</Text>
                </TouchableOpacity>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        padding: 20
    },

    input: {
        height: 40,
        marginBottom: 15,
        backgroundColor: 'rgba(255,255,255,0.2)',
        paddingHorizontal: 10,
        width: 300
    },

    buttonContainer: {
        backgroundColor: '#888',
        paddingVertical: 10
    },

    buttonText: {
        textAlign: 'center',
        color: '#fff',
        fontWeight: '700'
    }
});

import React from 'react';
import { StyleSheet, View } from 'react-native';
import {StackNavigator} from 'react-navigation';

export default class Dashboard extends React.Component {
    render() {
        return (
            <View style={styles.container}>
                <Text>this is Dashboard</Text>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1
    }
});

从“React”导入React；
从“react native”导入{StyleSheet，View}；
从“react navigation”导入{StackNavigator}；
导出默认类Dashboard扩展React.Component{
render（）{
返回(
这是仪表板
);
}
}
const styles=StyleSheet.create({
容器：{
弹性：1
}
});

---

我知道这是一个常见的问题，但我仍然不明白为什么“导航”对象没有作为道具传递给其他组件。

导航属性将被注入到为ScreenNavigator添加到route configs的所有屏幕中（在您的情况下为Home和Dashboard）。但是，对于这些屏幕的子组件，您必须传递导航属性

---

我看不出您在任何地方试图将导航作为道具传递到哪里？我对自己的反应还不熟悉，但我认为您需要在登录组件中创建LoginForm元素时传递属性@让我没有什么可以通过的。现在只想在单击按钮时导航到仪表板页面。如果我仍然需要这样做，你能告诉我通过哪个属性以及如何通过吗？我通过了教程，虽然没有通过，但教程仍然有效。我真的需要传递什么吗？@ChrisPossible replication of i see！！情况就是这样。谢谢你的回复和描述。你能回答我吗：我没有看到足够的优势来使用它。已经公布的答案似乎是公平的