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<div id=bb style="height:100px;width:100px;background:red"></div>
<script>
var bb=document.getElementById("bb")
for(i=2000;i>0;i-=500){
clearInterval(a)
a=setInterval(bb.style.width=parseFloat(bb.style.width)+100+'px',i)
if(i==1000)clearInterval(a)
}
</script>
<div id=bb style="height:100px;width:100px;background:red">test</div>
<script type="text/javascript">
var bb=document.getElementById("bb"),a = null;
for(i=2000;i>0;i-=500){
clearInterval(a);
a = setInterval(function(){bb.style.width=parseFloat(bb.style.width)+100+'px';},i);
if(i==1000){clearInterval(a)}
}
</script>