ES6 修飾器 在日誌記錄中的應用

{
  // 日誌系統
  let log = (type) => {
    return function(target, name, descriptor) {
      let src_method = descriptor.value
      descriptor.value = (...arg) => {
        src_method.apply(target, arg)
        console.info(`log ${type}`)
      }
    }
  }
  class AD {
    @log('show')
    show() {
      console.info('ad is show')
    }
    @log('click')
    click() {
      console.info('ad is click')
    }
  }

  let ad = new AD()
  ad.show()
  ad.click()
}