时间的各种转换+倒计时

js去除时分秒

var time_str= '2014-9-19 13:19:21';
var t = time_str.substr(0,10);
alert(t);

获取当前时间，格式YYYY-MM-DD

getNowFormatDate(date) {
    var seperator1 = "-";
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    if (month >= 1 && month <= 9) {
       month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    var currentdate = year + seperator1 + month + seperator1 + strDate;
    return currentdate;
},

时间戳转换成”yyyy–mm–dd”格式

fmtDate(timestamp) {
    var date = new Date(timestamp);
    var y = 1900 + date.getYear();
    var m = "0" + (date.getMonth() + 1);
    var d = "0" + date.getDate();
    return y + "-" + m.substring(m.length - 2, m.length) + "-" + d.substring(d.length - 2, d.length);
},

毫秒转 X分X秒

counttime(rowtime) {
    var second = Math.floor(rowtime / 1000);
    var min = Math.floor(parseInt(second) / 60);
    var second = parseInt(second) % 60;
    return min + '分' + second + '秒'
},

倒计时

countDown(){
    let maxtime = 30 * 60; //30分钟
    let minutes = '';
    let seconds = '';
    --maxtime;
    this.timer2 = setInterval(() => {
        if (maxtime >= 0) {
            minutes = Math.floor(maxtime / 60);
            seconds = Math.floor(maxtime % 60);
            --maxtime;
            if(seconds < 10){
                seconds = '0' + seconds;
            }
            this.timeRemaining = minutes + "分" + seconds + "秒";
        } else{
            clearInterval(this.timer2);
        }
    }, 1000);
},