Question

我的react-native变量出现问题。当我用console.log()显示变量时，一切都很好，我得到了它的内容。但是，当我将其与map一起使用时，我的变量是不确定的。这是我的代码。

const ServiceAction = (props) => {
    const { services } = props;
    console.log("Services:", services)
    return services.map((service, index) => {return <Text key={index}>{service.name}</Text>})
}

因此，当我将服务与地图一起使用时，这里的服务是不确定的，但在显示时却没有。

我刚刚调用了函数。

 const Dashboard: () => React$Node = (props) => {
        // const [state, dispatch] = React.useReducer(userReducer, props.navigation.getParam("user"));
        // const ip = props.navigation.getParam("ip");

        const ip = "192.168.1.37";
        const [state, dispatch] = React.useReducer(userReducer, initialStateUser);

        const [services, setServices] = React.useState([]);
        const [serviceAction, setServiceAction] = React.useState("Default");

        React.useEffect(() => {
            fetch(`http://${ip}:8080/about.json`)
                .then((response) => {return response.json()})
                .then((data) => setServices(data.server.services))
                .catch((err) => console.log(err))
        },[])


        return (
            <LinearGradient start={{x: 0, y: 0}} end={{x: 1, y: 1}} colors={['rgba(58,115,215,1)', 'rgba(44,120,215,1)', 'rgba(68,116,213,1)', 'rgba(47,105,191,1)', 'rgba(131,75,191,1)', 'rgba(198,98,237,1)']} style={styles.linearGradient}>
                <Image style={{width: 400, height: 50}} source={require('../assets/logo.png')}/>
                <ServiceAction services={services} />
            </LinearGradient>
        )
    }

如果有人有主意...

编辑：

服务是JSON格式

Services = [{
  name: 'toto'
 }, {
  name: 'titi'
 }
]

Answer 1

尝试这样：

const ServiceAction = (props) => {
    const { services } = props;
    let testArray = []
    console.log("Services:", services)
    services.map((service, index) => {testArray.push(<Text key={index}>{service.name}</Text>)})
    return testArray
}

反应本机未定义变量

1 个答案: