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显示倒数几秒

<html>

<head>

    <script  type="text/javascript">

    window.onload =function() {

       var i = 4;

      setInterval(function(){               

            if(i == 0) {

                    location.href = http://www.mamicode.com/"http://www.baidu.com/";

                }

                document.getElementById("test").innerHTML = i--;

            },1000);

        };

    </script>

</head>

<body>

  <span  id="test">5</span>秒后自动跳转

</body>

</html>