<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
#tempdiv
{
width: 10px;
height: 10px;
border-color: Blue;
border-width: 1px;
border-style: dotted;
}
</style>
<script type="text/javascript">
var intervalid;
function OnloadEvent() {
intervalid = setInterval("GrowingDiv()", 1);
}
function f1() {
var tempdiv = document.getElementById("tempdiv");
tempdiv.innerHTML = tempdiv.innerHTML + "a";
}
function GrowingDiv() {
var tempdiv = document.getElementById("tempdiv");
//alert(tempdiv.style.width);
var tempwidth = tempdiv.style.width;
var tempheight = tempdiv.style.height;
tempwidth = parseInt(tempwidth, 10);
tempheight = parseInt(tempheight, 10);
if (tempwidth > 1000) {
clearInterval(intervalid);
}
tempwidth = tempwidth + 1;
tempdiv.style.width = tempwidth + "px";
tempheight = tempheight + 1;
tempdiv.style.height = tempheight + "px";
//clearInterval(intervalid);
}
</script>
</head>
<body onload="OnloadEvent()">
<div id="tempdiv" style="width: 10px; height: 10px;">
</div>
</body>
</html>
原文：http://www.cnblogs.com/alex01/p/4352947.html