Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>
<div class="im">
</div>

Preparation code output

Test runner

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var $im = $('.im');
$im.each(function(i) {
  $im.eq(i).attr('hehe', '123');
});

var $im = $('.im');
$im.attr('hehe', '123')

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