Biegral Blog

var tt = setInterval(function () {
		dateDown(timeCalc(toTime))  //定义倒计时的结束时间，注意格式  
	}, 50); //定义计时器，每隔1000毫秒 也就是1秒 计算并更新 div的显示  
	var cha;  
    var toTime = new Date('2018/05/13 00:00:00');  ////iphone下时间固定为这个格式否则会发生错误  
    function timeCalc(toTime){
        var now = new Date();  
        cha= toTime - now;
        if(cha<=0 || !cha){
            var newCha = Math.ceil((now*1 - toTime*1)/(1000*60*60*24))
            toTime =toTime*1 + 24*60*60*1000 * newCha
        }
        cha= toTime - now;
        return cha;
    }
	function dateDown(cha) {
		/*var toTime = new Date(data);
		var now = new Date();
		var cha = toTime - now;
		if (cha <= 0) { //如果差小于等于0  也就是过期或者正好过期，则推出程序  
			$('.downTime span').html("00")
			clearInterval(tt); //清除计时器  
			return; //结束执行  
		}*/
		var h = Math.floor(cha / 1000 / 60 / 60 % 24);
		// var m = Math.floor(cha - Math.floor(cha/1000/60/60));
		var m = Math.floor(cha / 1000 / 60 % 60);
		var s = Math.floor(cha / 1000 % 60);
		var ms = (cha % 1000 + '').slice(0, 2);
		// console.log(document.getElementById("time"))
		if (h < 0) {
			h = "00";
		}
		if (m < 0) {
			m = "00"
		}
		if (s < 0) {
			s = "00"
		}
		if (ms < 0) {
			ms = "00"
		}
		if (h < 10) {
			h = "0" + h;
		}
		if (m < 10) {
			m = "0" + m;
		}
		if (s < 10) {
			s = "0" + s;
		}
		if (ms < 10) {
			ms = "0" + ms;
		}
		document.getElementById('_d').innerHTML = h;
		document.getElementById('_h').innerHTML = m;
		document.getElementById('_m').innerHTML = s;
		document.getElementById('_s').innerHTML = ms;
	}