<!DOCTYPE html>
<html>
<head>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
var div = $("div");
startAnimation();
function startAnimation(){
div.animate({height:300},"slow");
div.animate({300},"slow");
div.css("background-color","blue");
div.animate({height:100},"slow");
div.animate({100},"slow",startAnimation);
}
});
});
</script>
</head>
<body>
<button>Start Animation</button>
<div style="50px;height:50px;position:absolute;left:10px;top:50px;background-color:red;"></div>