js时间的一些处理

1.判断是否为同一天

function isSameFay(t) {
    return new Date(t).toDateString() === new Date().toDateString();
}

 2. 将时间字符串转换为时间戳NAN

var data = "2019-01-22 11:11:11";
//将"-"换成"/"，IOS不支持‘-’
var time = data.replace(/-/g, '/');
//转换成时间戳
time = new Date(time).getTime()

3.时间戳转化为字符串

function timestampTransformStrDate(timestamp, type){ //type 1 XX-XX-XX XX：XX:XX; 2 XX月XX日XX：XX
    var myDate = timestamp || new Date();
    //获取当前年
    var year = myDate.getFullYear();
    //获取当前月
    var month = myDate.getMonth() + 1;
    //获取当前日
    var day = myDate.getDate();
    var h = myDate.getHours(); //获取当前小时数(0-23)
    var m = myDate.getMinutes(); //获取当前分钟数(0-59)
    var s = myDate.getSeconds();
    //获取当前时间
    var now
    if (type == 1) {
        now = year + '-' + conver(month) + "-" + conver(day) + " " + conver(h) + ':' + conver(m) + ":" + conver(s);
    } else if (type == 2) {
        now = conver(month) + "月" + conver(day) + "日" + conver(h) + ':' + conver(m);
    }
    return now;
}

//日期时间处理
function conver(s) {
    return s < 10 ? '0' + s : s;
}

4.字符串转化为时间

function getDateFromString(dateString) {
    var parts = dateString.split(' ');
    if(parts.length < 1) {
        return null;
    }
    var part1 = parts[0].split('-');
    if(part1.length != 3) {
        return null;
    }
    var d = new Date(part1[0], part1[1] - 1, part1[2]);
    if(parts[1] && d) {
        var part2 = parts[1].split(':');
        if(part2) {
            d.setHours(part2[0]);
            d.setMinutes(part2[1]);
            d.setSeconds(part2[2]);
        }
    }
    return d;
}

5.比较日期大小

function compDate(date1, date2) {
    var a = Date.parse(date1) - Date.parse(date2);
    // console.log("a:"+a);
    if(a < 0) {
        // console.log("date1小!");
    } else if(a > 0) {
        // console.log("date1大!");
    } else if(a == 0) {
        // console.log("时间相等!");
    } else {
        return 'exception';
    }
    return a;
}

 6.设置剩余时间

var timeFlag = false 
var timeLeftTimer = setInterval(function() {
    setTimeLeft('2019-12-18 15:00:00')
}, 1000)

//设置剩余时间
function setTimeLeft(endTime) {
    endTimestamp = strDateTransformTimestamp(endTime)
    var timeLeft = endTimestamp - new Date().getTime()
    if (timeLeft <= 0) {
        timeFlag = true
    }
    var timeLeftD = parseInt(timeLeft / 86400000) //剩余天数
    var timeLeftH = parseInt((timeLeft % 86400000) / 3600000) //剩余小时数
    var timeLeftM = parseInt((timeLeft % 3600000) / 60000) //剩余分钟数
    var timeLeftS = parseInt((timeLeft % 60000) / 1000) //剩余秒数
    var timeLeftStr = timeLeftD + '天' + timeLeftH + '小时' + timeLeftM + '分' + timeLeftS + '秒'
    // console.log(timeLeftStr)if (timeFlag) {
        clearInterval(timeLeftTimer)
    }
}

//日期转换为时间戳
function strDateTransformTimestamp(str) { //str '2015-03-05 17:59:00'
    str = str.substring(0,19);    
    str = str.replace(/-/g,'/'); 
    return new Date(str).getTime();
}

 7.获取当前时间格式化

function getDate(){
    var myDate = new Date();
    //获取当前年
    var year = myDate.getFullYear();
    //获取当前月
    var month = myDate.getMonth() + 1;
    //获取当前日
    var date = myDate.getDate();
    var h = myDate.getHours(); //获取当前小时数(0-23)
    var m = myDate.getMinutes(); //获取当前分钟数(0-59)
    var s = myDate.getSeconds();
    //获取当前时间
    var now = year + '-' + conver(month) + "-" + conver(date) + " " + conver(h) + ':' + conver(m) + ":" + conver(s);
    return now;

}

//日期时间处理
function conver(s) {
    return s < 10 ? '0' + s : s;
}

 8.时间处理

function handleDate(date, isHasHMS, days) { //isHasHMS是否需要时分秒，date时间，days增加多少天
    var myDate = ''
    if (date) {
        myDate = new Date(date)
    } else {
        myDate = new Date()
    }
    if (days == undefined || days == '') {
        days = 0
    }
    myDate.setDate(myDate.getDate() + days)
    var year = myDate.getFullYear() //获取当前年
    var month = myDate.getMonth() + 1 //获取当前月
    var day = myDate.getDate() //获取当前日
    var hour = myDate.getHours() //获取当前小时数(0-23)
    var minute = myDate.getMinutes() //获取当前分钟数(0-59)
    var second = myDate.getSeconds() //获取当前秒(0-59)
    //获取当前时间

    if (isHasHMS) {
        date = year + '-' + this.conver(month) + "-" + this.conver(day) + " " + this.conver(hour) + ':' + this.conver(minute) + ":" + this.conver(second)
    } else {
        date = year + '-' + this.conver(month) + "-" + this.conver(day)
    }
    return date
}
conver(s) {
    return s < 10 ? '0' + s : s
}