Javascript倒计时效果

相对于服务器的时间，天 时 分 秒

 // 倒计时
//param{Date}start 开始日期 2018-11-03 06:00:00
//param{Date}end 结束日期 2018-11-03 06:00:00
function countTime(start,end) {
  // 开始时间
  var date = new Date(start.replace(/-/g,'/')); // ios 不支持2018-11-03 06:00:00
  var now = date.getTime();
  //设置截止时间
  var endDate = new Date(end.replace(/-/g,'/'));
  var end = endDate.getTime();
  //时间差
  var leftTime = 0;
  var timer = null;

  var d=00,h=00, m = 00, s=00;
  count();
  function count() {
    now += 1000;
    leftTime = end - now;
    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);
        if (h < 10 ) {
          h = '0'+h;
        }
        if (m < 10 ) {
          m = '0'+m;
        }
        if (s < 10 ) {
          s = '0'+s;
        }
    } else {
      h = 00;
      m = 00;
      s = 00;
      clearTimeout(timer);
    }
    document.getElementById("h").innerHTML = h;
    document.getElementById("m").innerHTML = m;
    document.getElementById("s").innerHTML = s;
    timer = setTimeout(function () {
        count();
    }, 1000);
  }


}
countTime("2018-11-03 06:00:00","2018-11-04 06:00:00");

相对于本地的时间，天 时 分 秒

// 倒计时
//param{Date}end 结束日期 2018-11-03 06:00:00
function countTime(end) {
  // 开始时间
  var date = new Date();
  var now = date.getTime();
  //设置截止时间
  var endDate = new Date(end.replace(/-/g,'/'));
  var end = endDate.getTime();
  //时间差
  var leftTime = 0;
  var timer = null;

  var h=00, m = 00, s=00;
  count();
  function count() {
    date = new Date());
    now = date.getTime();
    leftTime = end - now;
    if (leftTime >= 0) {
        h = Math.floor(leftTime / 1000 / 60 / 60 % 24);
        m = Math.floor(leftTime / 1000 / 60 % 60);
        s = Math.floor(leftTime / 1000 % 60);
        if (h < 10 ) {
          h = '0'+h;
        }
        if (m < 10 ) {
          m = '0'+m;
        }
        if (s < 10 ) {
          s = '0'+s;
        }
    } else {
      h = 00;
      m = 00;
      s = 00;
      clearTimeout(timer);
    }
    document.getElementById("h").innerHTML = h;
    document.getElementById("m").innerHTML = m;
    document.getElementById("s").innerHTML = s;
    timer = setTimeout(function () {
        count();
    }, 1000);
  }


}
countTime("2018-11-04 06:00:00");