<div id="demo"></div>

<script type="text/javascript">
    window.onload=function(){
        var demo=document.getElementById("demo");
        var count=5; //倒计时5秒；
        setTimeout(fn,1000);
        function fn(){
            count--;
            demo.innerHTML="本页面将在"+count+"秒之后跳转";
// 如果等于0秒，页面自动跳转到新页面
            if(count<=0){
                window.location.href="http://www.cnblogs.com/zhaocong/p/6947201.html";
            }else{
                setTimeout(fn,1000);s
            }
        }
    }
</script>