globalinnode.js

// File: global.js
var timestamp = new Date()
exports.global = {
    timestamp: timestamp
}
console.log('timestemp from global.js is ' + timestamp)


// File: foo.js
var _global = require('./global').global
console.log('timestemp from foo.js is ' + _global.timestamp)
console.log('change timestamp to ' + (_global.timestamp = new Date()))


// File: bar.js
var _global = require('./global').global
require('./foo')
console.log('timestemp from bar.js is ' + _global.timestamp)

// git bash
// node bar.js
// timestemp from global.js is  Tue Mar 05 2013 19:42:21 GMT+0800 (中国标准时间)
// timestemp from foo.js is     Tue Mar 05 2013 19:42:21 GMT+0800 (中国标准时间)
// change timestamp to          Tue Mar 05 2013 19:42:21 GMT+0800 (中国标准时间)
// timestemp from bar.js is     Tue Mar 05 2013 19:42:21 GMT+0800 (中国标准时间)