global.js

isCrossViewport(id) {
      const rect = document.getElementById(id).getBoundingClientRect()
      console.log('rect.top', rect.top)
      console.log('rect.bottom', rect.bottom)
      console.log('window.innerHeight', window.innerHeight)
      console.log(
        'document.documentElement.clientHeight',
        document.documentElement.clientHeight
      )
      return rect.bottom <= window.innerHeight
    },