AsyncStorage和Promise配合使用

代码：

AsyncStorage封装

import {AsyncStorage} from "react-native";

class DeviceStorage {
    //保存数据
   static saveData(keyName,keyValue) {
       var p = new Promise(function(resolve, reject){
           //做一些异步操作
           AsyncStorage.setItem(keyName, keyValue, function (error) {
               if (error) {
                   return resolve('存储失败');

               } else {
                   return  resolve('存储成功');
               }
           })

       });
       return p;

    }

    static loadData(keyName) {
        var p = new Promise(function(resolve, reject){
            //做一些异步操作
            AsyncStorage.getItem(keyName, function (error, result) {
                if (!error) {
                    return resolve(result);
                }else{
                    return resolve( '数据已经删除')
                }
            })

        });
        return p;

    }

    //删除指定的数据
    static  delData(keyName) {
       var p = new Promise(function (resolve,reject) {
           AsyncStorage.removeItem(keyName, function (error) {
               if (!error) {
                   return resolve( '数据已经删除') ;
               }else{
                   return resolve('数据删除失败' );
               }
           })
       })
        return p;

    }
}

export default DeviceStorage;

使用：

//保存
DeviceStorage.saveData("name","lpp").then(function(data){
           alert(data)

        });
//获取
   DeviceStorage.loadData("name").then(function(data){
            alert(data)

        });
//删除
DeviceStorage.delData("name").then(function(data){
            alert(data)

        });