对reactnative的AsyncStorage进行小型封装

/**
 * @overview A minimalistic wrapper around React Native's AsyncStorage.
 * @license MIT
 */
import { AsyncStorage } from 'react-native';
import merge from 'lodash';

const store = {
 /**
 * Get a one or more value for a key or array of keys from AsyncStorage
 * @param {String|Array} key A key or array of keys
 * @return {Promise}
 */
 get(key) {
 if(!Array.isArray(key)) {
 return AsyncStorage.getItem(key).then(value => {
 return JSON.parse(value);
 });
 } else {
 return AsyncStorage.multiGet(key).then(values => {
 return values.map(value => {
 return JSON.parse(value[1]);
 });
 });
 }
 },

 /**
 * Save a key value pair or a series of key value pairs to AsyncStorage.
 * @param {String|Array} key The key or an array of key/value pairs
 * @param {Any} value The value to save
 * @return {Promise}
 */
 save(key, value) {
 if(!Array.isArray(key)) {
 return AsyncStorage.setItem(key, JSON.stringify(value));
 } else {
 var pairs = key.map(function(pair) {
 return [pair[0], JSON.stringify(pair[1])];
 });
 return AsyncStorage.multiSet(pairs);
 }
 },

 /**
 * Updates the value in the store for a given key in AsyncStorage. If the value is a string it will be replaced. If the value is an object it will be deep merged.
 * @param {String} key The key
 * @param {Value} value The value to update with
 * @return {Promise}
 */
 update(key, value) {
 return store.get(key).then(item => {
 value = typeof value === 'string' ? value : merge({}, item, value);
 return AsyncStorage.setItem(key, JSON.stringify(value));
 });
 },

 /**
 * Delete the value for a given key in AsyncStorage.
 * @param {String|Array} key The key or an array of keys to be deleted
 * @return {Promise}
 */
 delete(key) {
 if (Array.isArray(key)) {
 return AsyncStorage.multiRemove(key);
 } else {
 return AsyncStorage.removeItem(key);
 }
 },

 /**
 * Get all keys in AsyncStorage.
 * @return {Promise} A promise which when it resolves gets passed the saved keys in AsyncStorage.
 */
 keys() {
 return AsyncStorage.getAllKeys();
 }
};

export default store ;




然后你需要的地方import store 进来就好了。

使用方法 
store.save(key,value)
.then(()=>{store.get(key)})
.then(()=>{store.delete(key)})
.catch(error()=>{console.log(error)})

注意在调用时请使用 ansyc await