nodejs 全局对象

// global objects in nodejs:
// current JavaScript file:
console.log('current js file: ' + __filename);

// current JavaScript file dir:
console.log('current js dir: ' + __dirname);

process.name = 'Sample Nodejs';

// process.argv 存储了命令行参数:
console.log('arguments: ' + JSON.stringify(process.argv));

// process.cwd() 返回当前工作目录:
console.log('cwd: ' + process.cwd());

// 切换当前工作目录, Windows的目录类似 'C:\\Windows\\System32'
process.chdir('/private/tmp');

console.log('cwd: ' + process.cwd());
// process.nextTick()将在下一轮事件循环中调用:

process.nextTick(function () {
console.log('nextTick callback!');

});

console.log('nextTick was set!');
// 程序即将退出时的回调函数:

process.on('exit', function (code) {
console.log('about to exit with code: ' + code);
});

1.console

> global.console
Console {
  log: [Function: bound ],
  info: [Function: bound ],
  warn: [Function: bound ],
  error: [Function: bound ],
  dir: [Function: bound ],
  time: [Function: bound ],
  timeEnd: [Function: bound ],
  trace: [Function: bound trace],
  assert: [Function: bound ],
  Console: [Function: Console] }

2.process

> process === global.process;
true
> process.version;
'v5.2.0'
> process.platform;
'darwin'
> process.arch;
'x64'
> process.cwd(); //返回当前工作目录
'/Users/michael'
> process.chdir('/private/tmp'); // 切换当前工作目录
undefined
> process.cwd();
'/private/tmp'

3.