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}