"Can not use 'await' outside an async function"- React Native 文档出错

Question

我是 React Native 的新手。我正在制作这个需要打开 WiFi 的应用程序。我为 wifi 使用了 npm i react-native-wifi-reborn 包。在尝试该网页提供的示例时出现错误 不能在异步函数外使用'await' 我复制了相同的代码，仍然遇到这个错误。

代码

import { PermissionsAndroid } from 'react-native';
 
const granted = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
      {
        title: 'Location permission is required for WiFi connections',
        message:
          'This app needs location permission as this is required  ' +
          'to scan for wifi networks.',
        buttonNegative: 'DENY',
        buttonPositive: 'ALLOW',
      },
);
if (granted === PermissionsAndroid.RESULTS.GRANTED) {
    // You can now use react-native-wifi-reborn
} else {
    // Permission denied
}

点击Here查看网站。

Answer 1

开发人员希望您使用 top-level async/await，或者更可能是希望您正确处理异步调用的简单示例：

const getLocationPermission = async () => {
    try {
        const granted = await PermissionsAndroid.request(
            PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION, 
            {
                title: 'Location permission is required for WiFi connections',
                message: 'This app needs location permission as this is required to scan for wifi networks.',
                buttonNegative: 'DENY',
                buttonPositive: 'ALLOW',
            },
        );

        if (granted === PermissionsAndroid.RESULTS.GRANTED) {
            // You can now use react-native-wifi-reborn
        } else {
            // Permission denied
        }
    } catch (e) {
        // Handle unexpected error
    }
}

我不希望 React Native 处理顶级 async/await 因此您必须将对 PermissionsAndroid.request 的调用包装在异步函数中。

Answer 2

错误自行解释。您必须在 async 函数中使用 await 。试试这个：

  const isPermissionGranted = async() => {
    const granted = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
      {
        title: 'Location permission is required for WiFi connections',
        message:
          'This app needs location permission as this is required  ' +
          'to scan for wifi networks.',
        buttonNegative: 'DENY',
        buttonPositive: 'ALLOW',
      },
);

if (granted === PermissionsAndroid.RESULTS.GRANTED) {
    return true;
} else {
    return false;
}

}

"Can not use 'await' outside an async function"- React Native 文档出错

"Can not use 'await' outside an async function"- Error on React Native Docs

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async-await

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