对react native 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