js刷新

<script type="text/javascript">
        function SetTime() {
            document.getElementById("Time").innerHTML = parseInt(document.getElementById("Time").innerHTML) -1;
            setInterval("CheckTime();", 1000);
        }
        function CheckTime() {
            var ddd = document.getElementById("Time");
            if (parseInt(ddd.innerHTML) !="1") {
                ddd.innerHTML = parseInt(ddd.innerHTML) -1;
            }
            else {
                alert('时间已到');
                //你的操作
             }
         }
    </script>

<div>
        <div id="Time" style="border:1px solid red;">60</div>
    </div>