我用node.js实现了一个画图板的同步功能，执行npm install时出现了以下警告，图片在下面。。。

Question

这是警告信息
我网上查了说只是警告，没有关系，但是下边执行的时候也还有问题，截图如下

我想请问以下这是什么问题

var express = require('express'), 
    app = express(),
    http = require('http'),
    socketIo = require('socket.io');

var server = http.createServer(app);
var io = socketIo.listen(server);
server.listen(8080);
app.use(express.static(__dirname + '/public'));
console.log("Server running on 127.0.0.1:8080");

// array of all lines drawn
var line_history = [];

// event-handler for new incoming connections
io.on('connection', function (socket) {

   // first send the history to the new client
   for (var i in line_history) {
      socket.emit('draw_line', { line: line_history[i] } );
   }

   // add handler for message type "draw_line".
   socket.on('draw_line', function (data) {
      // add received line to history 
      line_history.push(data.line);
      // send line to all clients
      io.emit('draw_line', { line: data.line });
   });
});

Answer 1

改个端口先试试，是不是8080被占用了