jsはタイムスタンプを設定し、カウントダウンを行います.イベント終了時間など

  
  
      
      
      
        function countTime() {  
            //        
            var date = new Date();  
            var now = date.getTime();  
            //        
            var str="2017/5/17 00:00:00";
            var endDate = new Date(str); 
            var end = endDate.getTime();  
            
            //     
            var leftTime = end-now; 
            //     d,h,m,s          
            var d,h,m,s;  
            if (leftTime>=0) {  
                d = Math.floor(leftTime/1000/60/60/24);  
                h = Math.floor(leftTime/1000/60/60%24);  
                m = Math.floor(leftTime/1000/60%60);  
                s = Math.floor(leftTime/1000%60);                     
            }  
            //       div   
            document.getElementById("_d").innerHTML = d+" ";  
            document.getElementById("_h").innerHTML = h+" ";  
            document.getElementById("_m").innerHTML = m+" ";  
            document.getElementById("_s").innerHTML = s+" ";  
            //      countTime  ，          
            setTimeout(countTime,1000);  
  
        }  
      
  
  
    
  
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