如何避免意外的标识符

Question

关于节点js我是新的，我想写一个Hello Word。这是代码：

var http = require('http');

// Configure our HTTP server to respond with Hello World to all requests.
var server = http.createServer(function (request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.end("Hello World\n");
});

// Listen on port 8000, IP defaults to 127.0.0.1
server.listen(8000);

// Put a friendly message on the terminal
console.log("Server running at http://127.0.0.1:8000/");

当我启动节点时，我以这种方式调用文件并获得意外的标识符异常：

http://it.tinypic.com/r/n3uo45/8

任何人都可以帮助我？