Object exports

      module.exports 的引用

      示例代码

      1. // common.js
      2. function sayHello(name) {
      3.   console.log(Hello ${name} !)
      4. }
      5. function sayGoodbye(name) {
      6.   console.log(Goodbye ${name} !)
      7. }
      9. module.exports.sayHello = sayHello
      10. exports.sayGoodbye = sayGoodbye