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HTML

              
                <button id="start">スタート</button>
<button id="cansel">キャンセル</button>
<div id="result"></div> 
              
            
!

CSS

              
                
              
            
!

JS

              
                document.addEventListener('DOMContentLoaded',function(){
  //タイマーID
  let timerID;
  
  //「スタート」ボタン押下時に呼び出される関数。
  function start(){
    
    document.getElementById('result').innerHTML += 'ここはsetTimeoutよりも前の行です。<br>';
    
    function print(){

      document.getElementById('result').innerHTML += '3秒経過しました。<br>';
    }
    
    //3秒後にprint()を実行。
    timerID = setTimeout(print,3000);
    
    document.getElementById('result').innerHTML += 'ここはsetTimeoutよりも後ろの行です。<br>';

  }

   //「キャンセル」ボタン押下時に呼び出される関数。
  function cansel(){
    //タイマーを終了する。
    window.clearTimeout(timerID);
    //キャンセルした旨を画面に表示する。
    document.getElementById('result').textContent += "キャンセルされました。";
  }
  
  //イベントリスナー登録(スタート)
  document.getElementById('start').addEventListener('click',start,false);

  //イベントリスナー登録(キャンセル)
  document.getElementById('cansel').addEventListener('click',cansel,false);
},false);
              
            
!
999px

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