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<style>
.a{}
</style>
<div class="a" id="aaa123"></div>
<div class="a" id="aaa133"></div>
<div class="a" id="aaa2323"></div>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script language="javascript">
$(".a").each(arr, function(){这里是你的javascript代码。attr就是你要访问的对象。});
</script>
<style>
.a{}
</style>
<div class="a" id="aaa123"></div>
<div class="a" id="aaa133"></div>
<div class="a" id="aaa2323"></div>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script language="javascript">
$(".a").each(arr, function(){这里是你的html代码。attr就是你要访问的对象。});
</script>
var i=1;
var obj = document.getElementById("aaa"+i);
var el = document.getElementsByTagName('div');
for (var i=0;i <el.length;i++)
{
if (el[i].id.indexOf('aaa') == 0)
return el[i];
}