let disk = new NengeDisk(Moudule),path='saves';
FS.createPath('/', path, !0, !0);
FS.mount(disk, {}, path);

await disk.mountReady();
//wait indexDB file => FS file;

replace(
    /_RWebAudioInit\(latency\)\s?\{/,
    '_RWebAudioInit(latency){Module.latency=latency;'
).replace(
    /function\s?_RWebAudioStart\(\)\s?\{/,
    'function _RWebAudioStart() {if(RA.context && RA.context.state != "running") return Module.mobileAudioRun(RA);'
).replace(
    /_RWebAudioWrite\(\)\s?\{/,
    '_RWebAudioWrite(buf,size){if(RA.context&&RA.context.state != "running")return Module.mobileAudioRun(RA);\n'
);
{
    mobileAudioRun(RA) {
        let M = Module;
        M.pauseMainLoop && M.pauseMainLoop();
        //show some UI to user
        //some event like click  to run==>mobileAudioRest(RA);
    };
    mobileAudioRest(RA) {
        let M = Module;
        RA = RA || M.RA;
        if (RA.context) RA.context.resume();
        if (!RA.context || RA.context.state != 'running') {
            RA.bufIndex = 0;
            RA.bufOffset = 0
            var ac = window["AudioContext"] || window["webkitAudioContext"];
            if (RA.context) {
                RA.context.close();
                delete RA.context;
            }
            RA.context = new ac;
            RA.numBuffers = M.latency * RA.context.sampleRate / (1e3 * RA.BUFFER_SIZE) | 0;
            if (RA.numBuffers < 2) RA.numBuffers = 2;
            for (var i = 0; i < RA.numBuffers; i++) {
                RA.buffers[i] = RA.context.createBuffer(2, RA.BUFFER_SIZE, RA.context.sampleRate);
                RA.buffers[i].endTime = 0
            }
            RA.nonblock = false;
            RA.startTime = 0;
            RA.context.createGain();
            RA.setStartTime();
            RA.context.resume();
        }
        M.resumeMainLoop();
    }
}

T.DB_NAME = 'RetroArch_WEB';
T.LibStore = 'data-libjs';
T.version = 5;
T.DB_STORE_MAP = {
    'data-rooms': {},
    'data-info': { 'system': false },
    'data-system': {},
    'data-bios': { 'system': false },
    'retroarch': { 'timestamp': false },
    'userdata': { 'timestamp': false },
    'data-libjs': {},
};

let system = Nenge.getStore('data-system');
await system.get('gambatte_libretro.zip');
//output {contents:{xxx.js:Uint8Array},system:'gb',filesize: ,filetype: ,timestamp: ,type}
//if has 'contents' and filesize>0x6400000:gambatte_libretro.zip,gambatte_libretro.zip-part-1,gambatte_libretro.zip-part-2=>contents0,contents1,contents2=>contents
await system.data('gambatte_libretro.zip');
//output {xxx.js:Uint8Array}
system.remove('gambatte_libretro.zip');
//indexdb remove  gambatte_libretro.zip
system.put('gambatte_libretro.zip',1);
//indexdb add  gambatte_libretro.zip=>1
//if filesize>0x6400000 will add gambatte_libretro.zip,gambatte_libretro.zip-part-1,gambatte_libretro.zip-part-2
system.setData('gambatte_libretro.zip',1);
//indexdb add  gambatte_libretro.zip=>{contents:1,timestamp:}
await system.keys();
//output ['gambatte_libretro.zip']
await system.all();
//output {'gambatte_libretro.zip':{data...}}
await system.cursor('system',1);
//output {'gambatte_libretro.zip':{system:'gb'}}
await system.cursor('system',1,IDBKeyRange.only('gb'));
//output {'gambatte_libretro.zip':{system:'gb'}}
await system.cursor('system',1,IDBKeyRange.only('gba'));
//output {}

Nenge.FetchItem({
    url:'gambatte_libretro.zip',//core file
    unpack:true,//if a zip/7z/rar4
    key:'gambatte_libretro.zip',//if null this name will be href name;
    store:'data-system',//if set this,will save or load on IndexDB
    dataOption:{
        system:'gb'//indexDB add save option data
    },
    /* other option */
    get:{k:1},//if set, url=>gambatte_libretro.zip?k=1
    post:Nenge.I.post({'key':1} | [FormElment][FormData] ),//post method
    json:{},//if post a json File Body
    /* end option */
    success(contents){
        if(contents instanceof Uint8Array){
            //base return 
        }else{
            //if a  zip/7z/rar4 and open upack=true
            Nenge.I.toArr(contents,entry=>{

            });
        }
    },
    error(text){
    },
    process(status){
        // 0% => 100% download
    }

});
Nenge.FetchItem({
    url:'xx.json',
    type:'json',
    success(json){
    },
    error(text){
    },
    process(status){
        // 0% => 100% download
    }
});

Nenge.ajax({
    url:'xx.json',
    type:'json',
    success(json){
    },
    error(text){
    },
    process(status){
        // 0% => 100% download
    },
    PostProcess(status){
        // 0% => 100% upload
    }
});