js之侧边栏分享

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>广告自动关闭</title>    
    </head>
    <style>
        .tip{
            position: fixed;
            top: 100px;
            left: 400px;
            display: block;
            width: 400px;
            height: 200px;
            border-style: dotted;
            border-width: thin;
            border-color: darkgreen;
            background: #f0c;
            z-index: 100;
        }
        
    </style>
    <script type="text/javascript" src="js/base.js"></script>
    <script>
        /*
        window.onload = function(){
            var timer = setInterval(function(){
                var _span = document.getElementsByTagName("span")[0];
                _span.innerHTML -= 1;
                
                if(_span.innerHTML == 0){
                    clearInterval(timer);
                    document.getElementById("ad").style.display = "none";
                }
            },1000);
        }
        */
        
        window.onload = function(){
            var num = 5;
            var oDiv = document.getElementById("ad");
            var t = setInterval(function(){
                countDown();
                if(num == 0) {
                    clearInterval(t);
                    oDiv.style.display = "none";
                }
            },1000);
        
            function countDown(){
                oDiv.children[0].innerHTML -= 1;
                num--;
            }
        }
    </script>
    <body>
        <div id="ad" class="tip">
            我是一条广告，谢谢！
            <span style="color:yellow; font-weight:bold;">5</span>秒钟后自动关闭
        </div>
    </body>
</html>
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