<script src="https://cdn.jsdelivr.net/pako/1.0.3/pako.min.js"></script>

<script>

var pako = window.pako; 

//https://api.okex.co.kr/kr/docs/webSocketAPI/webSocketAPI

var okexSocket = new WebSocket("wss://real.okex.com:8443/ws/v3");

okexSocket.binaryType = 'arraybuffer';

//okexSocket.binaryType = 'blob';

okexSocket.onopen = function(){

setInterval(function(){

//console.log('okex ping');

okexSocket.send('ping');

}, 10000);

//okexSocket.send('{"op": "subscribe", "args": ["spot/ticker:BTC-USDT","spot/candle60s:BTC-USDT"]}');

//okexSocket.send('{"op": "subscribe", "args": ["spot/trade:BTC-USDT"]}');

okexSocket.send('{"op": "subscribe", "args": ["spot/ticker:BTC-KRW","spot/candle60s:BTC-KRW"]}');

};

okexSocket.onmessage = function(evt){

//https://github.com/nodeca/pako

//console.log(evt);

var arr = new Uint8Array(evt.data);

var resultAsBinString  = pako.inflateRaw(arr, { to: 'string' });

console.log(resultAsBinString);

if(resultAsBinString != 'pong')

{

var data = JSON.parse(resultAsBinString);

console.log(data);

}

};

</script>