为啥指数推送令牌为空

Posted 2023-02-24

【中文标题】为啥指数推送令牌为空

【英文标题】：Why exponentpush token is null为什么指数推送令牌为空

【发布时间】：2018-06-23 11:48:43

【问题描述】：

为什么 ExponentPush 令牌为空我 console.log 令牌显示为空 ..................................................... ..................................................... ..................................................... ..................................................... ..................................................... ..................................................... .....

见下图：

push_notifications.js

import Permissions, Notifications from 'expo';
import axios from 'axios';
import AsyncStorage from 'react-native';

const PUSH_ENDPOINT = 'http://rallycoding.herokuapp.com/api/tokens';
export default async () => 
    let previousToken = await AsyncStorage.getItem('pushtoken');
    console.log(previousToken);
    if (previousToken) 
        return;
     else 
        let  status  = await Permissions.askAsync(Permissions.NOTIFICATIONS);
        if (status !== 'granted') 
            return;
        
        let token = await Expo.Notifications.getExpoPushTokenAsync();
        await  axios.post(PUSH_ENDPOINT, token: token);
        AsyncStorage.setItem('pushtoken', token);
    

;

【参考方案1】：

let previousToken = await AsyncStorage.getItem('pushtoken');
console.log(previousToken);

您正在尝试访问AsyncStorage 以查找密钥为pushtoken 的项目。如果此应用程序是第一次运行，它将是null。您需要至少执行一次setItem。