倒计时跳转页面

<h3>目标：百度<span id='t'></span></h3>
<script>
        var i=5;
        var t=document.getElementById('t');
         t.innerHTML =i+'秒后跳转';
         setInterval(function () {
              t.innerHTML=--i+'秒后跳转';
              if(i==0){
                 location.href='baidu.com'
            }
        },1000)
</script>