about how to use WebSocket to receive and display pictures or manipulate binary __web

JS Operation WebSocket receive the binary system, security can be guaranteed, has been a year of practice test:

[JavaScript] View Plain copy ws.onmessage = function (evt)  {       if (typeof ( Evt.data) = = "string") {           texthandler (JSON.parse ( Evt.data));       }else{            var reader = new filereader ();            reader.onload = function (evt) {                if (evt.target.readystate == filereader.done) {                    var data = new  uint8array (evt.target.result);                    handler (data);               &nbsP;}            }            reader.readasarraybuffer (evt.data);       }  };     
[HTML]View plain copy function handler (data) {switch (data[0]) {case 1:getcard (data[1));      Break ...

JS Operation WebSocket received pictures, just write today, but also with FileReader implementation.[HTML] View Plain copy ws.onmessage = function (evt)  {       if (typeof ( Evt.data) = = "string") {           //texthandler (JSON.parse ( Evt.data);       }else{     var reader = new  filereader ();           reader.onload =  function (evt) {               if ( Evt.target.readystate == filereader.done) {                    var url = evt.target.result;       alert (URL);                    var img = document.getelementbyid ("ImgDiv");       img.innerhtml =  "