当前页面跳转倒计时

<p ><span id="span">5</span>秒后进入主页....</p> <script>     var number = 5;     var span = document.getElementById("span");     function get() {         number--;         if(number <= 0){             location.href="https://www.baidu.com";         }         span.innerHTML=number + "";     }     setInterval(get,1000);
</script>