text: window.addEventListener('load', start)
  
  const clickArray = []
  
  function start() {
    const button = document.querySelector('#clickButton')
    button.addEventListener('click', handleButtonClick)
  }
  
  function handleButtonClick() {
    clickArray.push(getNewTimestamp())
    render()
  }
  
  function render() {
    const ul = document.querySelector('#data')
    ul.innerHTML = ''
    let lis = ''
  
    clickArray.map(item => {
      lis += `<li>${item}</li>`
    })
  
    ul.innerHTML = lis
  
    document.title = clickArray.length
  }
  