JS实现简单的天、时、分、秒倒计时代码

  
  
  
      
    js简单时分秒倒计时  
      
        function countTime() {  
            //获取当前时间  
            var date = new Date();  
            var now = date.getTime();  
            //设置截止时间  
            var endDate = new Date("2016-10-22 23:23:23");  
            var end = endDate.getTime();  
            //时间差  
            var leftTime = end-now;  
            //定义变量 d,h,m,s保存倒计时的时间  
            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);                     
            }  
             h = h >= 10 ? h : `0${h}`;
             m = m >= 10 ? m : `0${m}`;
             s = s >= 10 ? s : `0${s}`;
            //将倒计时赋值到div中  
            document.getElementById("_d").innerHTML = d+"天";  
            document.getElementById("_h").innerHTML = h+"时";  
            document.getElementById("_m").innerHTML = m+"分";  
            document.getElementById("_s").innerHTML = s+"秒";  
            //递归每秒调用countTime方法，显示动态时间效果  
            setTimeout(countTime,1000);  
  
        }  
      
  
  
    
  
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