柠檬铺

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<p>  

    <span id="timer"></span> 秒后自动返回  

    <a href="http://www.qianduanzu.com/">直接跳转</a>  

</p>

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window.onload = function(){  

     var time = 3; //设置时间为几秒  

     var timer = document.getElementById('timer'); //获取ID为timer的对象  

     timer.innerHTML = time; //初始化显示秒数  

     time = time - 1;  

     var g = window.setInterval(function(){  

         if(time<0){  

             window.clearTimeout(g); //清除动画  

             window.location.href = 'http://www.qianduanzu.com/'; //跳转到指定地址  

             //window.history.back(-1); //后退  

         } else {  

             showTime();  

         }  

     },1000);  

     //显示函数  

     function showTime(){  

         timer.innerHTML = time;  

         time--;  

     }  

 };

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<meta http-equiv="refresh" content="3;url=http://www.qianduanzu.com