警告：在简单的Javascript类中不推荐使用isMounted（...）

我正在使用react-navigation实现2个屏幕。但是在导航到第二页时我收到了以下警告：

I am implementing 2 screens using react-navigation. But I got the warning below while navigating to the second page:

警告：isMounted（...）在普通Javascript类中已弃用。相反，请确保清除componentWillUnmount中的订阅和待处理请求以防止内存泄漏。

Warning: isMounted(...) is deprecated in plain Javascript Classes. Instead, make sure to clean up subscriptions and pending requests in componentWillUnmount to prevent memory leaks.

版本：

• react：16.3.1


• react-native：0.55.2


• react -navigation：1.5.11


• util：0.10.3

• react: 16.3.1
• react-native: 0.55.2
• react-navigation: 1.5.11
• util: 0.10.3

登录。 js

import React, { Component } from 'react';
import { Text, View, Image, TextInput, TouchableOpacity } from 'react-native';
import styles from "./styles";

export default class Login extends Component {
    constructor(props) {
    super(props);
}

render() {
    const { navigate } = this.props.navigation;     
    return (
        <View style={styles.container}>         
            <View style={styles.formContainer}>                 
                <TouchableOpacity style={styles.button} onPress={()=> navigate('Home')} >
                    <Text style={styles.buttonText}>LOGIN</Text>
                </TouchableOpacity>
            </View>
        </View>
    )
}

Home.js

import React, { Component } from 'react';
import { Text, View } from 'react-native';
import styles from "./styles";

export default class Home extends Component {
    constructor(props) {
        super(props);
    }
    render() {
        const { navigate } = this.props.navigation;
        return(
            <View style={styles.container}>         
                <Text>Home Screen</Text>
            </View>
        )
    }
}

我在这里缺少什么？