老师，帮忙检查下

来源：1-25 编程练习

goufully

2019-04-30 15:01:39

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>闪烁的文字</title>
<style type="text/css">
div {
width: 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 text = document.getElementById("text");
//释放内存
var timer = null;
//接受闪烁值
var num = 0;
timer = setInterval(function () {
if (num) {
num = 0;
text.innerHTML = "☆☆☆今日特卖☆☆☆";

} else{
num = 1;

text.innerHTML = "★★★今日特卖★★★";

}
}, 500);

</script>
</body>
</html>