描述：当用户打开页面之后，显示对联广告，广告在5秒之后关闭。
实现代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>定时关闭广告</title>
<style>
*{
margin: 0;
border: 0;
}
.content{
width: 1200px;
height: 1200px;
//background: coral;
margin: 0 auto;
}
img{
position: fixed;
top: 50%;
margin-top: -220px;
}
.img1{
left: 10px;
}
.img2{
right: 10px;
}
</style>
</head>
<body>
<div class="content"></div>
<img class="img1" src="./images/1.gif" alt="">
<img class="img2" src="./images/2.gif" alt="">
</body>
</html>
<script>
window.onload = function () {
var imgArr = document.getElementsByTagName("img");
setTimeout(fn,5000);
function fn() {
imgArr[0].style.display = "none";
imgArr[1].style.display = "none";
}
}
</script>