微信小程序实现日期格式化和倒计时

Date.prototype.Format = function (fmt) { //author: meizz   var o = {    "M+": this.getMonth() + 1, //月份     "d+": this.getDate(), //日     "h+": this.getHours(), //小时     "m+": this.getMinutes(), //分     "s+": this.getSeconds(), //秒     "q+": Math.floor((this.getMonth() + 3) / 3), //季度     "S": this.getMilliseconds() //毫秒   };  if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));  for (var k in o)  if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));  return fmt; }

formatDateTime:function(theDate) { var _hour = theDate.getHours(); var _minute = theDate.getMinutes(); var _second = theDate.getSeconds(); var _year = theDate.getFullYear() var _month = theDate.getMonth(); var _date = theDate.getDate(); if (_hour < 10) { _hour ="0" + _hour } if (_minute < 10) { _minute = "0" + _minute } if (_second < 10) { _second = "0" + _second } _month = _month + 1 if (_month < 10) { _month = "0" + _month; } if (_date < 10) { _date ="0" + _date } var time= _year + "-" + _month + "-" + _date + " " + _hour + ":" + _minute + ":" +  _second;// var time = new Date();// var formatTime = formatDateTime(time);// 返回结果：// Tue Jun 06 2017 15:31:09 GMT+ 0800(中国标准时间)// 2017 - 06 - 06 15:31:09//clock为在data中定义的空变量，存放转化好的日期 this.setData({  clock: time })},

var formatTimeS = new Date('2017-06-06 15:31:09').getTime();

var formatTimeS = new Date(1496734269900);

//倒计时:其中time_canshu为传入的毫秒数date_format: function (time_canshu) { // let formatTime1 = new Date().getTime(); // let formatTime2 = new Date('2018-04-24 15:31:09').getTime(); // let formatTimeS = new Date(formatTime2 - formatTime1); var none = '00:00:00'; if (formatTimeS<=0){  this.setData({  clock: none })} else { // 秒数 letsecond = Math.floor(time_canshu / 1000); // 小时位 lethr = Math.floor(second / 3600); // 分钟位 letmin = Math.floor((second - hr * 3600) /60); // 秒位 letsec = second % 60;// equal to => var sec = second % 60; if (hr <= 9) hr ='0' + hr; if (min <= 9) min ='0' + min; if (sec <= 9) sec ='0' + sec; lettime = hr + ":" + min + ":" + sec + " "; this.setData({  clock: time }) }},

//时间戳转化为日期格式function timestampToTime(timestamp) {    var date = new Date(timestamp * 1000);//时间戳为10位需*1000，时间戳为13位的话不需乘1000    var Y = date.getFullYear() + '-';    var M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '-';    var D = date.getDate() + ' ';    var h = date.getHours() + ':';    var m = date.getMinutes() + ':';    var s = date.getSeconds();    return Y+M+D+h+m+s;  }  timestampToTime(1403058804);  console.log(timestampToTime(1403058804));//2014-06-18 10:33:24 //日期格式转化为时间戳var date = new Date('2014-04-23 18:55:49:123');  // 有三种方式获取  var time1 = date.getTime();  var time2 = date.valueOf();  var time3 = Date.parse(date);  console.log(time1);//1398250549123  console.log(time2);//1398250549123  console.log(time3);//1398250549000//以上三种获取方式的区别：第一、第二种：会精确到毫秒第三种：只能精确到秒，毫秒用000替代以上三个输出结果可观察其区别注意：获取到的时间戳除以1000就可获得Unix时间戳，就可传值给后台得到。

secondToDate (result) {   if (result > 60) {    let d = parseInt(Math.floor(result / 86400))    let h = d > 0? Math.floor((result - d * 86400) / 3600): Math.floor(result / 3600);    let m = h > 0? Math.floor((result - d * 86400 - h * 3600) / 60): Math.floor(result / 60);    return d + '天:' + h + '时:' + m + '分'   } else {    return result + '秒'   }  }