关于前端:JS日期的格式化

在 Date 原型链上扩大

// 对日期格式化
Date.prototype.Format = function (fmt) {
    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() + ""));
    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;
}
// 应用：new Date(1542274800000).Format('yy-MM-dd hh:mm:ss');

Vue filter

Vue.filter('dateFilter', function (value) {if (/^[0-9]*$/.test(value)) {return new Date(value).Format('yyyy-MM-dd')
    } else {return value}
})

获取指定日期的年月日

function addZero(item) {return item < 10 ? "0" + item : item;}
// 获取指定日期的前 N 天日期，startDay 默认当天
function getDate(start, end, startDay) {let day = !!startDay ? new Date(startDay) : new Date();
    day.setTime(day.getTime() + start * 24 * 60 * 60 * 1000);
    let s1 =
        day.getFullYear() +
        "-" +
        addZero(day.getMonth() + 1) +
        "-" +
        addZero(day.getDate());
    let day1 = !!startDay ? new Date(startDay) : new Date();
    day1.setTime(day1.getTime() + end * 24 * 60 * 60 * 1000);
    let s2 =
        day1.getFullYear() +
        "-" +
        addZero(day1.getMonth() + 1) +
        "-" +
        addZero(day1.getDate());
    return {
        startDate: s1,
        endDate: s2,
    };
}

将工夫转换为 13 位工夫戳

function swtichToTimestamp(time) {if (/^[0-9]*$/.test(time)) { // 工夫戳
        if (time.length > 13) {time = time.slice(0, 13)
        } else {time = time + Array(14 - time.length).join("0")
        }
    } else { // 工夫
        time = new Date(time).getTime()}
    return +time
}

比拟两个工夫的差时

function getTimeDiffByType(time1, time2, type) {
    let diff = time1 - time2
    let base = 1000
    switch (type) {
        case 'day':
            base = base * 60 * 60 * 24
            break
        case 'hour':
            base = base * 60 * 60
            break
        case 'minute':
            base = base * 60
            break
    }
    return diff/base | 0
}