Reactnative atob() btoa() 在没有远程 JS 调试的情况下无法工作

我在react native中有一个测试应用程序，当我远程启用调试js时，一切都正常.它在设备(来自XCode)和模拟器中运行良好，运行后:

react-native run ios

问题是，如果我停止远程js调试，登录测试将不再有效.登录逻辑非常简单，我正在获取api以测试登录，api端点通过https.

我需要改变什么？

Updated: This code works perfetly with JS Debug Remote Enabled, if I disable it, it not works anymore.

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React, { Component } from 'react'
import {
  AppRegistry,
  StyleSheet,      
  View,
  Button,
  Alert
} from 'react-native'

export default class MyClass extends Component {

  constructor (props) {
    super(props)
    this.testFetch = this.testFetch.bind(this)
  }

  async testFetch () {
    const email = 'email@example.com'
    const password = '123456'

    try {
      const response = await fetch('https://www.example.com/api/auth/login', {
        /* eslint no-undef: 0 */
        method: 'POST',
        headers: {
          'Accept': 'application/json' /* eslint quote-props: 0 */,
          'Content-Type': 'application/json',
          'Authorization': 'Basic ' + btoa(email + ':' + password)
        }

      })
      Alert.alert('Error fail!', 'Fail')
      console.log(response)
    } catch (error) {
      Alert.alert('Error response!', 'Ok')
    }
  }

  render () {
    return (
      <View style={styles.container}>            
        <Button
          onPress={this.testFetch}
          title="Test me!"

        />            
      </View>
    )
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF'
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5
  }
})

AppRegistry.registerComponent('testingReactNative', () => MyClass)

谢谢