<div id="target">
  <div>A</div>
  <div>B</div>
  <div>C</div>
</div>

<script type="text/javascript">
var divs = document.getElementById( 'target' )
                   .getElementsByTagName( 'div' )
;
for( var i = 0; i < divs.length; i++ ) {
  divs[i].addEventListener( 'click', function() {
    alert( i );    
  } );
}
</script>

<script type="text/javascript">
var divs = document.getElementById( 'target' )
                   .getElementsByTagName( 'div' )
;
for( var i = 0; i < divs.length; i++ ) {
  ( function() {
      var j = i;
      divs[i].addEventListener( 'click', function() {
      alert( j );
    } );
  } )();
}
</script>