运行node.js时出现问题

我是node.js的新手。我按照这里的下载和安装说明进行操作。

现在的问题是，当我在我的终端

节点

我得到以下消息

No script was specified.
Usage: node [options] script.js [arguments] 
Options:
  -v, --version      print node's version
  --debug[=port]     enable remote debugging via given TCP port
                     without stopping the execution
  --debug-brk[=port] as above, but break in script.js and
                     wait for remote debugger to connect
  --v8-options       print v8 command line options
  --vars             print various compiled-in variables
Enviromental variables:
NODE_PATH            ':'-separated list of directories
                     prefixed to the module search path,
                     require.paths.
NODE_DEBUG           Print additional debugging output.
Documentation can be found at http://nodejs.org/api.html or with 'man node'

之后，我尝试了这个例子:

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World'n');
}).listen(8124, "127.0.0.1");
console.log('Server running at http://127.0.0.1:8124/');

提示:ReferenceError: console is not defined.

我在谷歌上搜索了一下，发现我没有正确安装nodejs，所以我又安装了一次，但没有成功:(

请帮忙!!