node exercise

w11_node/save-dots/server/index.js

@@ -0,0 +1,34 @@
+import path from 'path';
+import express from 'express';
+import fs from 'fs';
+import { createServer } from 'http';
+import { Server } from 'socket.io';
+// Create a server on port 3000
+const PORT = process.env.PORT || 3000;
+
+const app = express();
+const server = createServer(app);
+// socket.io
+
+const io = new Server(server, {
+  cors: {
+    origin: '*',
+  },
+});
+
+server.listen(PORT, function () {
+  console.log('Server listening at port %d', PORT);
+});
+
+// Optionally routing your app
+// app.use(express.static(path.join(__dirname, '../client')));
+
+io.on('connection', function (socket) {
+  socket.on('save', function (data) {
+    //...  
+  });
+
+  socket.on('load', function () {
+    ///...
+  });
+});