代码如下：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>闪烁的文字</title>
<style type="text/css">
div{
200px;
height:200px;
line-height:200px;
border:2px solid gray;
text-align:center;
color:red;
}
</style>
</head>
<body>
<h3>会闪烁的文字</h3>
<div id="text"> </div>
<script type="text/javascript">
var oText=document.getElementById("text");
var num=0,timer=null;
timer=setInterval(function(){
if(num==0)
{
oText.innerHTML="☆☆☆今日特卖☆☆☆"
num=1
}
else
{
oText.innerHTML="★★★今日特卖★★★"
num=0
}
},500)
</script>
</body>
</html>