javascript-带有异步功能的箭头函数,在本机反应中等待
作者:互联网
我正在尝试在react-native中将数据保存在AsyncStorage中.我想异步保存它,所以使用async和await关键字.
async onPositiveClickListener = () => {
// user has completed product tour_end
try {
await AsyncStorage.setItem("@ProductTour:key", "true");
const { navigate } = this.props.navigation;
navigate("DashboardScreen");
} catch (error) {
console.log(error);
}
};
保存程序时出现错误
SyntaxError: Unexpected token, expected ( (40:32)
38 | };
39 |
> 40 | async onPositiveClickListener = () => {
| ^
41 | // save user has completed product tour_end
42 | try {
43 | await AsyncStorage.setItem("@ProductTour:key", "true");
Hide Stack Trace
SyntaxError: Unexpected token, expected ( (40:32)
38 | };
39 |
> 40 | async onPositiveClickListener = () => {
| ^
41 | // save user has completed product tour_end
42 | try {
解决方法:
异步命名箭头函数应声明为
const onPositiveClickListener = async () => {
// user has completed product tour_end
try {
await AsyncStorage.setItem("@ProductTour:key", "true");
const { navigate } = this.props.navigation;
navigate("DashboardScreen");
} catch (error) {
console.log(error);
}
};
标签:javascript,react-native,async-await,react-native-android 来源: https://codeday.me/bug/20191010/1887322.html