React Native AsyncStorage local storage tool class

import {AsyncStorage} from 'react-native';

export default class StorageUtil {

  /**
   * 保存一个Json对象
   * @param key
   * @param value
   * @param callback
   */
  static async saveJsonObject(key, value) {
    return await this.saveString(key, JSON.stringify(value));
  }


  /**
   * 获取一个Json对象
   * @param key
   * @param defaultObject
   */
  static async getJsonObject(key, defaultObject) {
    let result=null;
    try{
      result=await this.getString(key,null);
      result=await JSON.parse(result);
    }catch (err){
      if(defaultObject){
        return Promise.resolve(defaultObject);
      }else{
        return Promise.reject(err);
      }
    }
    return result;

  }


  /**
   * 保存一个值
   * @param key
   * @param value
   */
  static async saveString(key, value) {
    if (key != null && value != null) {
      //Key 与Value 都不为空
      try {
         await AsyncStorage.setItem(key, value)
      } catch (err) {
        return Promise.reject(err)
      }
      return Promise.resolve(true);
    } else {
      return Promise.reject({"msg": "Key and value can not be null"});
    }
  }

  /**
   * 获取一个值
   * @param key
   * @param defaultValue
   */
  static async getString(key, defaultValue) {
    let result = null;
    let noDataError = {"msg": "No value found !"};
    if (key != null) {
      result = await AsyncStorage.getItem(key);
      // console.log('get string result',result,defaultValue);
      return result ? result : defaultValue!=null ? defaultValue : Promise.reject(noDataError);
    } else {
      if (defaultValue) {
        return Promise.resolve(defaultValue);
      } else {
        return Promise.reject(noDataError);
      }
    }

  }


  /**
   * 移除一个值
   * @param key
   */
  static async remove(key) {
    let result = true;
    try {
      result = await AsyncStorage.removeItem(key);
    } catch (err) {
      return Promise.reject(err)
    }
    return result;
  }


  /**
   * 获取所有已存储
   */
  static async getAllKeys() {
    let result=true;
    try {
      result = await AsyncStorage.getAllKeys();
    } catch (err) {
      return Promise.reject(err)
    }
    return result;
  }

}

StorageUtil.saveJsonObject(KEY_LOCAL_USER_INFO, user);

StorageUtil.getJsonObject(KEY_LOCAL_USER_INFO).then(data=>{console.log(data))}

StorageUtil.remove(KEY_LOCAL_USER_INFO)