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jsp实现半小时的倒计时页面

Java代码 
<%@ page language="java"  pageEncoding="UTF-8"%>  
<div id="leftTime"></div>  
<script>  
      
    var leftTime = <%=Integer.parseInt("1800")%>;  
      
    function showLeftTime(){  
        var leftMinutes = parseInt(leftTime/60);  
        var leftSeconds = parseInt(leftTime%60);  
          
        if(leftTime < 0){  
            clearInterval(timer);  
            document.location.href = document.location.href;  
            //document.getElementById('leftTime').innerHTML = '';  
              
        }else{  
            document.getElementById('leftTime').innerHTML = '      如未选择付费方式 ,剩余时间小于5分钟将不允许支付 ,剩余时间:'+leftMinutes+'分'+leftSeconds+'秒';  
        }  
        leftTime--;  
    }  
      
      
    var timer = setInterval('showLeftTime()',1000);  
      
</script> 
 

补充:软件开发 , Java ,
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