模仿百度首页“元宵节汤圆”动图：（js的定时任务：setInterval）
原理：需要一张切图，通过不断定位使得图片就像一帧一帧的图片在播放从而形成了动画
效果图：
切图地址：
https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png
页面代码：
<!DOCTYPE html>
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%
String ctxPath = request.getContextPath();
request.setAttribute("ctxpath", ctxPath);//项目根路径
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="${ctxpath}/js/jquery-1.11.3.min.js"></script>
<%-- <link href="${ctxpath}/css/main.css" rel="stylesheet"> --%>
<title>首页</title>
<style type="text/css"> </style>
<script type="text/javascript">
$(function(){ //6210
// 0 270 540 810 1080 1890 2700 2970 3510 3780 4050 4320 5130 5940 6480 7290
// 定时任务,每隔100ms执行一次函数
setInterval("tangyuan()",);
setInterval("tangyuan1()",);
//setInterval("indexChange()",1);
}); //汤圆 正着挖
var count = ;
function tangyuan(){
count = count - ;
if(count == -){
count = ;
}
var ctxpath = '${ctxpath}';
//url("https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png")
//https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png
$("#tangyuan").css("background","url("+ctxpath+"/img/baidu/baidu_tangyuan.png) "+count+"px"+" 0px no-repeat");
} //汤圆 倒着挖
var count1 = -;
function tangyuan1(){
count1 = count1 + ;
if(count1 == ){
count1 = -;
}
var ctxpath = '${ctxpath}';
//url("https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png")
//https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png
$("#tangyuan1").css("background","url("+ctxpath+"/img/baidu/baidu_tangyuan.png) "+count1+"px"+" 0px no-repeat");
}
</script>
</head>
<body>
<span style="position: absolute;left: 30%">汤圆我要正着挖(●ˇ∀ˇ●)：</span>
<!-- background: url("https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png") -2970px 0px no-repeat; -->
<div id="tangyuan" style="position: absolute; top: 0px; left: 50%; cursor: pointer; width: 270px; height: 129px; margin-left: -135px;" title="团团圆圆乐元宵">
</div>
<span style="position: absolute;left: 0%">汤圆我要倒着挖o(*￣︶￣*)o：</span>
<!-- background: url("https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/img/1519708766000_4f5d68844a93b929405a11d217ef0bf5.png") -2970px 0px no-repeat; -->
<div id="tangyuan1" style="position: absolute; top: 0px; left: 20%; cursor: pointer; width: 270px; height: 129px; margin-left: -135px;" title="团团圆圆乐元宵">
</body>
</html>