倒计时

function aa() {
var totalSecond = 11111 - Date.parse(new Date())/1000;

var interval = setInterval(function () {
// 秒数
var second = totalSecond;

// 天数位
var day = Math.floor(second / 3600 / 24);
var dayStr = day.toString();
if (dayStr.length == 1) dayStr = '0' + dayStr;

// 小时位
var hr = Math.floor((second - day * 3600 * 24) / 3600);
var hrStr = hr.toString();
if (hrStr.length == 1) hrStr = '0' + hrStr;

// 分钟位
var min = Math.floor((second - day * 3600 *24 - hr * 3600) / 60);
var minStr = min.toString();
if (minStr.length == 1) minStr = '0' + minStr;

// 秒位
var sec = second - day * 3600 * 24 - hr * 3600 - min*60;
var secStr = sec.toString();
if (secStr.length == 1) secStr = '0' + secStr;
console.log(dayStr + ':' + hrStr + ':' + minStr + ':' +secStr);

totalSecond--;
if (totalSecond < 0) {
console.log('已结束')
}
}.bind(this), 1000);
}