javascript- advertising popups

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <script type="text/javascript">
            var time;
            window.onload = function(){
                time = setTimeout ( " show () " , 2000 ); // start calling the show method after setting two seconds and a time to remember the return value of the setTimeout
            }
            function show(){
                var img1 = document.getElementById("img1");
                img1.style.display =  " Block " ; // set a picture as display
                clearTimeout (time); // remove the original setTimeout settings, you can not write, because here are reassigned
                time = window.setTimeout ( " hide () " , 2000 ); call hide () method // hide picture after two seconds and the time to re-assignment.   
            }
            function hide(){
                var img1 = document.getElementById("img1");
                img1.style.display =  " none " ; // set a picture as hidden
                clearTimeout (time); // optional
                time = window.setTimeout ( " show () " , 2000 ); // two seconds after the call to show () method to display pictures, time and reassigned
            }
        </script>
    </head>
    <body>
        <img src="img3.jpg" id="img1" id="img1">
    </body>
</html>

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Origin www.cnblogs.com/wwww2/p/12106621.html