Add files via upload

index.js

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+const 
+    http=require('http'),
+    fs=require('fs'),
+    path=require('path'),
+    mime=require('mime'),
+    chatServer=require('./lib/chat_server');
+
+var cache={};//缓存静态文件内容
+//发送错误响应
+function send404(response){
+    response.writeHead(404,{'Content-Type':'text/plain'});
+    response.write('Error 4.4:文件未找到。');
+    response.end();
+}
+//发送文件内容
+function sendFile(response,filePath,fileContents){
+    response.writeHead(
+        200,
+        {"content-Type":mime.lookup(path.basename(filePath))}
+    );
+    response.end(fileContents);
+}
+//查找文件
+function serveStatic(response,cache,absPath){
+    if(cache[absPath]){
+        sendFile(response,absPath,cache[absPath]);
+    }else{
+        fs.exists(absPath,function(exists){
+            if(exists){
+                fs.readFile(absPath,function(err,data){
+                    if(err){
+                        send404(response);
+                    }else{
+                        cache[absPath]=data;
+                        sendFile(response,absPath,data);
+                    }
+                });
+            }else{
+                send404(response);
+            }
+        });
+    }
+}
+
+
+//入口
+var server=http.createServer(function(request,response){
+    var filePath=false;
+    console.log(`new request for ${request.url}`);
+    if(request.url==='/'){
+        filePath='public/index.html';
+    }else{
+        filePath='public'+request.url;
+    }
+
+    var absPath='./'+filePath;
+    serveStatic(response,cache,absPath);
+});
+server.listen(3000,function(){
+    console.log("the server is listening on prot 3000.");
+});
+chatServer.listen(server); //websocket服务也绑定到该端口上

package.json

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+{
+  "name": "chat_room",
+  "version": "1.0.0",
+  "description": "this is a room where you can chat with your friends",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "sfs",
+  "license": "ISC",
+  "dependencies": {
+    "socket.io":"2.0.3",
+    "mime":"1.3.6"
+  }
+}

test.js

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+var map=new Map();
+console.log(map.get('sdf'));