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

var common = require('common.js')
Page({
  helloMINA: function() {
    common.sayHello('MINA')
  },
  goodbyeMINA: function() {
    common.sayGoodbye('MINA')
  }
})

//输出结果

    Hello ${name} !

Goodbye ${name} !

这是什么情况啊