javascript - AsyncStorage 获取项目

Question

如何在“componentDidMount”处获取 AsyncStorage 项目，这里是我的代码

componentDidMount() {

	AsyncStorage.getItem('customer_id').then((value)=> this.setState({ customer_id: value }));
        console.log(this.state.customer_id); /* doesn't work */
        console.log(`${this.state.customer_id}`); /* doesn't work */
  }
	
	
  render() {return <View><Text>Customer ID : {this.state.customer_id}</Text></View>; /* it's work */     }

Answer 1

您必须处理 AsyncStorage - 异步，这很有趣!无论如何，您想将回调传递给处理结果的 getItem 方法。尝试

componentDidMount(){
    AsyncStorage.getItem('customer_id', (error,value) => {
        if (!error) { //If there are no errors
            //handle result
            if (result !== null) this.setState({customer_id:value}); 
        }
    });
}