// common.js
function sayHello(name) {
  console.log(Hello ${name} !)
}
function sayGoodbye(name) {
  console.log(Goodbye ${name} !)
}
module.exports.sayHello = sayHello
exports.sayGoodbye = sayGoodbye

// a.js
GameGlobal.globalData = 1

// b.js
console.log(GameGlobal.globalData) // 输出 "1"