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IE9>--use addEventListener()
<script>
  document.getElementById('pink').addEventListener('click', function(){
    alert('clicked on pink');
  }, false);
</script>
  
  
  IE8--use attachEvent()
  <script> 
  document.getElementById('pink').attachEvent{'onclick', function(){
    alert('clicked on pink');
  }
  </script>
  
  Cross browser 
  <script> 
  if (window.addEventListener){
    document.getElementById('pink').addEventListener('click', function(){
      alert('clicked on pink');
      console.log('addEventListener');
    }, false);
  }else if (window.attachEvent) {
    document.getElementById('pink').attachEvent('onclick', function(){
      alert('clicked on pink');
      console.log('attachEvent');
    });
  }
  </script>