一、实现当前时间到指定截止时间的倒计时功能
<html>
<head>
<title>TEST</title>
</head>
<body>
<script>
//获取当前时间距离截止时间的倒计时
//参数为截止时间
var leftTimer = function(year, month, day, hour, minute, second){
var leftTime = (new Date(year, month-1, day, hour, minute, second)) - (new Date());//计算剩余毫秒数
var days = parseInt(leftTime / 1000 / 60 / 60 / 24, 10);//计算剩余天数
var hours = parseInt(leftTime / 1000 / 60 / 60 % 24, 10);//计算剩余小时数
var minutes = parseInt(leftTime / 1000 / 60 % 60, 10);//计算剩分钟数
var seconds = parseInt(leftTime / 1000 % 60, 10);//计算剩余秒数
days = checkTime(days).toString();
hours = checkTime(hours).toString();
minutes = checkTime(minutes).toString();
seconds = checkTime(seconds).toString();
return days + ' : ' + hours + ' : ' + minutes + ' : ' + seconds
}
var checkTime = function(i){
if(i < 10){
i = "0" + i;
}
return i;
}
setInterval(function() {
document.getElementById('testId').innerHTML = leftTimer(2018, 12, 31, 11, 0, 0)
}, 1000)
</script>
<div id="testId"> </div>
</body>
</html>
二、获取当前的年月日时分秒
var currTime = new Date(); //获取当前时间的毫秒数
var year = currTime.getFullYear(); //获取当前时间的年份
var month = currTime.getMonth() + 1; //获取当前时间的月份，月份从0开始，所以需要加一
var day = currTime.getDate(); //获取当前时间的日期，getDay()可以获取星期几
var hour = currTime.getHours(); //获取当前时间的小时数
var minute = currTime.getMinutes(); //获取当前时间的分钟数
var second = currTime.getSeconds(); //获取当前时间的秒数
三、毫秒数转成年月日时分秒
//毫秒数转换成时间
var getCurrentTime = function(milliseconds){
var myDate = new Date(milliseconds);
var year = myDate.getFullYear();
var month = myDate.getMonth() + 1;
var day = myDate.getDate()
var hour = myDate.getHours();
var minute = myDate.getMinutes();
var second = myDate.getSeconds();
month = checkTime(month).toString();
day = checkTime(day).toString();
hour = checkTime(hour).toString();
minute = checkTime(minute).toString();
second = checkTime(second).toString();
return year+"-"+month+"-"+day+" "+hour+":"+minute+":"+second;
}
// 只有一位数字时添加“0”
var checkTime = function(i){
if(i < 10){
i = "0" + i;
}
return i;
}