请求的键值不是对象

Question

import React, {Component} from 'react';
import {View} from 'react-native-animatable';
import {AppRegistry, StyleSheet, Text, StatusBar, AppState} from 'react- 
native';
import {Svg, Path} from 'react-native-svg';
import Fingerprint from 'react-native-fingerprint-android';

export default class example extends Component {
static PHASE_NORMAL = 'rgba(62, 130, 247, 1)';
static PHASE_WARN = 'rgba(255, 241, 118, 1)';
static PHASE_FAIL = 'rgba(239, 83, 80, 1)';
static PHASE_SUCCESS = 'rgba(38, 166, 154, 1)';

componentDidMount() {
    this.authenticate();

    AppState.addEventListener("change", async(state) => {
        try {
            if(state === "active" && await Fingerprint.isAuthenticationCanceled()) {
                this.authenticate()
            }
        }
        catch(z) {
            console.error(z)
        }
    })
}

state = {
    phase: 'normal',
    message: '',
    cancelled: false
}

async componentWillUnmount() {
    try {
        if(!Fingerprint.isAuthenticationCanceled()) {
            //stop listening to authentication.
            await Fingerprint.cancelAuthentication();
        }
    } catch(z) {
        console.error(z);
    }
}

async authenticate() {
    this.setState({
        phase: 'normal', 
        message: ''
    })

    try {
        // do sanity checks before starting authentication flow.
        // HIGHLY recommended in real life usage. see more on why you should do this in the readme.md
        const hardware = await Fingerprint.isHardwareDetected();
        const permission = await Fingerprint.hasPermission();
        const enrolled = await Fingerprint.hasEnrolledFingerprints();

        if (!hardware || !permission || !enrolled) {
            let message = !enrolled ? 'No fingerprints registered.' : !hardware ? 'This device doesn\'t support fingerprint scanning.' : 'App has no permission.'
            this.setState({
                phase: 'fail',
                message
            });
            return;
        }

        await Fingerprint.authenticate(warning => {
            this.setState({
                phase: 'warn',
                message: warning.message
            })
        });

        // if we got this far, it means the authentication succeeded.
        this.setState({
            phase: 'success',
            message: ''
        });

        // in real life, we'd probably do something here (process the payment, unlock the vault, whatever)
        // but this is a demo. so restart authentication.
        setTimeout(() => this.authenticate(), 3000);

    } catch (error) {
        if(error.code == Fingerprint.FINGERPRINT_ERROR_CANCELED) {
            // we don't show this error to the user.
            // we will check if the auth was cancelled & restart the flow when the appstate becomes active again.
            return;
        }
        this.setState({
            phase: 'fail',
            message: error.message
        })
    }
}

getPhaseColor(): string {
    return example['PHASE_'+this.state.phase.toUpperCase()];
}

render() {
    return (
        <View style={{flex:1}}>
            <View duration={1000} transition="backgroundColor"
                  style={[styles.container, {backgroundColor: this.getPhaseColor()}]}>
                <View style={styles.icon}>
                    <Svg width={100} height={100} viewBox="0 0 24 24">
                        <Path fill={this.getPhaseColor()} d="M11.83,1.73C8.43,1.79 6.23,3.32 6.23,3.32C5.95,3.5 5.88,3.91 6.07,4.19C6.27,4.5 6.66,4.55 6.96,4.34C6.96,4.34 11.27,1.15 17.46,4.38C17.75,4.55 18.14,4.45 18.31,4.15C18.5,3.85 18.37,3.47 18.03,3.28C16.36,2.4 14.78,1.96 13.36,1.8C12.83,1.74 12.32,1.72 11.83,1.73M12.22,4.34C6.26,4.26 3.41,9.05 3.41,9.05C3.22,9.34 3.3,9.72 3.58,9.91C3.87,10.1 4.26,10 4.5,9.68C4.5,9.68 6.92,5.5 12.2,5.59C17.5,5.66 19.82,9.65 19.82,9.65C20,9.94 20.38,10.04 20.68,9.87C21,9.69 21.07,9.31 20.9,9C20.9,9 18.15,4.42 12.22,4.34M11.5,6.82C9.82,6.94 8.21,7.55 7,8.56C4.62,10.53 3.1,14.14 4.77,19C4.88,19.33 5.24,19.5 5.57,19.39C5.89,19.28 6.07,18.92 5.95,18.6V18.6C4.41,14.13 5.78,11.2 7.8,9.5C9.77,7.89 13.25,7.5 15.84,9.1C17.11,9.9 18.1,11.28 18.6,12.64C19.11,14 19.08,15.32 18.67,15.94C18.25,16.59 17.4,16.83 16.65,16.64C15.9,16.45 15.29,15.91 15.26,14.77C15.23,13.06 13.89,12 12.5,11.84C11.16,11.68 9.61,12.4 9.21,14C8.45,16.92 10.36,21.07 14.78,22.45C15.11,22.55 15.46,22.37 15.57,22.04C15.67,21.71 15.5,21.35 15.15,21.25C11.32,20.06 9.87,16.43 10.42,14.29C10.66,13.33 11.5,13 12.38,13.08C13.25,13.18 14,13.7 14,14.79C14.05,16.43 15.12,17.54 16.34,17.85C17.56,18.16 18.97,17.77 19.72,16.62C20.5,15.45 20.37,13.8 19.78,12.21C19.18,10.61 18.07,9.03 16.5,8.04C14.96,7.08 13.19,6.7 11.5,6.82M11.86,9.25V9.26C10.08,9.32 8.3,10.24 7.28,12.18C5.96,14.67 6.56,17.21 7.44,19.04C8.33,20.88 9.54,22.1 9.54,22.1C9.78,22.35 10.17,22.35 10.42,22.11C10.67,21.87 10.67,21.5 10.43,21.23C10.43,21.23 9.36,20.13 8.57,18.5C7.78,16.87 7.3,14.81 8.38,12.77C9.5,10.67 11.5,10.16 13.26,10.67C15.04,11.19 16.53,12.74 16.5,15.03C16.46,15.38 16.71,15.68 17.06,15.7C17.4,15.73 17.7,15.47 17.73,15.06C17.79,12.2 15.87,10.13 13.61,9.47C13.04,9.31 12.45,9.23 11.86,9.25M12.08,14.25C11.73,14.26 11.46,14.55 11.47,14.89C11.47,14.89 11.5,16.37 12.31,17.8C13.15,19.23 14.93,20.59 18.03,20.3C18.37,20.28 18.64,20 18.62,19.64C18.6,19.29 18.3,19.03 17.91,19.06C15.19,19.31 14.04,18.28 13.39,17.17C12.74,16.07 12.72,14.88 12.72,14.88C12.72,14.53 12.44,14.25 12.08,14.25Z"/>
                    </Svg>
                </View>

                <Text style={styles.welcome}>
                    {this.state.phase === 'normal' && 'Touch the fingerprint sensor.'}
                    {this.state.phase === 'warn' && 'Try again.'}
                    {this.state.phase === 'fail' && 'Authentication failed.'}
                    {this.state.phase === 'success' && 'Authentication succeeded.'}
                </Text>
                <Text>
                    {this.state.message}
                </Text>
            </View>
            <StatusBar backgroundColor="rgba(0, 0, 0, 0.2)" translucent={true}/>
        </View>

    );
}
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center'
    },
    welcome: {
        fontFamily: 'Roboto',
        color: 'black',
        fontSize: 26,
        textAlign: 'center',
        margin: 10,
        marginTop: 20
    },
    icon: {
        borderRadius: 100,
        padding: 20,
        backgroundColor: "#fff",
        elevation: 5
    }
});

AppRegistry.registerComponent('example', () => example);

运行此代码时，显示错误