广告框自动关闭

作者: 这里是久顾 | 来源:发表于2017-06-15 20:37 被阅读0次

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>广告框自动关闭</title>
<style>
.ad {
width: 400px;
height: 200px;
position: fixed;
top: 100px;
left: 400px;
background-color: blue;
border: 2px solid black;
}
</style>

    <script>
            
        window.onload = function() {
            var ad = document.getElementById("ad");
            var num = document.getElementById("num");
            var count = 5;
            var timer = setInterval(function() {
                count--;
                if(count == 0) {
                    ad.style.display = "none";
                    clearInterval(timer);
                }
                num.innerHTML = count;
            }, 1000)
        }
    </script>
    
    
</head>
<body>
    <div id="ad" class="ad">我是广告框<span id="num">5</span>s后消失</div>
</body>

</html>