var ws = new WebSocket("ws://xxx.xxx.xxx.xxx:8888");

ws.onopen = function(){
    console.log("握手成功");
};

ws.onmessage = function(e) {
    var reader = new FileReader();
  	reader.onload = function (event) {
      var contents = event.target.result;
      var a = new Image();
      a.src = contents;
      document.body.appendChild(a);
    }
    reader.readAsDaraURL(e.data);
};