js - 闭包

function outer(){
    var context = "outer";
    return function inner(){
        console.log(context);
    }
}
var fn = outer();
fn();

(() => {
if (bannerList.length > 0) {
return bannerList.map((banner,index) => {
return (
<View key={index} style={styles.slide}>
<Image style={styles.image} source={{ uri: banner.imagePath}} />
</View>
)
})
}
})()