时间格式化

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/**
* 格式化时间
*
* @param {time} 时间
* @param {cFormat} 格式
* @return {String} 字符串
*
* @example formatTime('2018-1-29', '{y}/{m}/{d} {h}:{i}:{s}') // -> 2018/01/29 00:00:00
*/
formatTime(time, cFormat) {
if (arguments.length === 0) return null
if ((time + '').length === 10) {
time = +time * 1000
}

var format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}', date
if (typeof time === 'object') {
date = time
} else {
date = new Date(time)
}

var formatObj = {
y: date.getFullYear(),
m: date.getMonth() + 1,
d: date.getDate(),
h: date.getHours(),
i: date.getMinutes(),
s: date.getSeconds(),
a: date.getDay()
}
var time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
var value = formatObj[key]
if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
if (result.length > 0 && value < 10) {
value = '0' + value
}
return value || 0
})
return time_str
}


/**
* 返回指定长度的月份集合
*
* @param {time} 时间
* @param {len} 长度
* @param {direction} 方向: 1: 前几个月; 2: 后几个月; 3:前后几个月 默认 3
* @return {Array} 数组
*
* @example getMonths('2018-1-29', 6, 1) // -> ["2018-1", "2017-12", "2017-11", "2017-10", "2017-9", "2017-8", "2017-7"]
*/
getMonths(time, len, direction) {
var mm = new Date(time).getMonth(),
yy = new Date(time).getFullYear(),
direction = isNaN(direction) ? 3 : direction,
index = mm;
var cutMonth = function(index) {
if ( index <= len && index >= -len) {
return direction === 1 ? formatPre(index).concat(cutMonth(++index)):
direction === 2 ? formatNext(index).concat(cutMonth(++index)):formatCurr(index).concat(cutMonth(++index))
}
return []
}
var formatNext = function(i) {
var y = Math.floor(i/12),
m = i%12
return [yy+y + '-' + (m+1)]
}
var formatPre = function(i) {
var y = Math.ceil(i/12),
m = i%12
m = m===0 ? 12 : m
return [yy-y + '-' + (13 - m)]
}
var formatCurr = function(i) {
var y = Math.floor(i/12),
yNext = Math.ceil(i/12),
m = i%12,
mNext = m===0 ? 12 : m
return [yy-yNext + '-' + (13 - mNext),yy+y + '-' + (m+1)]
}
// 数组去重
var unique = function(arr) {
if ( Array.hasOwnProperty('from') ) {
return Array.from(new Set(arr));
}else{
var n = {},r=[];
for(var i = 0; i < arr.length; i++){
if (!n[arr[i]]){
n[arr[i]] = true;
r.push(arr[i]);
}
}
return r;
}
}
return direction !== 3 ? cutMonth(index) : unique(cutMonth(index).sort(function(t1, t2){
return new Date(t1).getTime() - new Date(t2).getTime()
}))
}



/**
* 返回指定长度的天数集合
*
* @param {time} 时间
* @param {len} 长度
* @param {direction} 方向: 1: 前几天; 2: 后几天; 3:前后几天 默认 3
* @return {Array} 数组
*
* @example date.getDays('2018-1-29', 6) // -> ["2018-1-26", "2018-1-27", "2018-1-28", "2018-1-29", "2018-1-30", "2018-1-31", "2018-2-1"]
*/
getDays(time, len, diretion) {
var tt = new Date(time)
var getDay = function(day) {
var t = new Date(time)
t.setDate(t.getDate() + day)
var m = t.getMonth()+1
return t.getFullYear()+'-'+m+'-'+t.getDate()
}
var arr = []
if (diretion === 1) {
for (var i = 1; i <= len; i++) {
arr.unshift(getDay(-i))
}
}else if(diretion === 2) {
for (var i = 1; i <= len; i++) {
arr.push(getDay(i))
}
}else {
for (var i = 1; i <= len; i++) {
arr.unshift(getDay(-i))
}
arr.push(tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate())
for (var i = 1; i <= len; i++) {
arr.push(getDay(i))
}
}
return diretion === 1 ? arr.concat([tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()]) :
diretion === 2 ? [tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()].concat(arr) : arr
}


/**
* @param {s} 秒数
* @return {String} 字符串
*
* @example formatHMS(3610) // -> 1h0m10s
*/
formatHMS (s) {
var str = ''
if (s > 3600) {
str = Math.floor(s/3600)+'h'+Math.floor(s%3600/60)+'m'+s%60+'s'
}else if(s > 60) {
str = Math.floor(s/60)+'m'+s%60+'s'
}else{
str = s%60+'s'
}
return str
}

/*获取某月有多少天*/
getMonthOfDay (time) {
var date = new Date(time)
var year = date.getFullYear()
var mouth = date.getMonth() + 1
var days

//当月份为二月时,根据闰年还是非闰年判断天数
if (mouth == 2) {
days = year % 4 == 0 ? 29 : 28
} else if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12) {
//月份为:1,3,5,7,8,10,12 时,为大月.则天数为31;
days = 31
} else {
//其他月份,天数为:30.
days = 30
}
return days
}

/*获取某年有多少天*/
getYearOfDay (time) {
var firstDayYear = this.getFirstDayOfYear(time);
var lastDayYear = this.getLastDayOfYear(time);
var numSecond = (new Date(lastDayYear).getTime() - new Date(firstDayYear).getTime())/1000;
return Math.ceil(numSecond/(24*3600));
}

/*获取某年的第一天*/
getFirstDayOfYear (time) {
var year = new Date(time).getFullYear();
return year + "-01-01 00:00:00";
}

/*获取某年最后一天*/
getLastDayOfYear (time) {
var year = new Date(time).getFullYear();
var dateString = year + "-12-01 00:00:00";
var endDay = this.getMonthOfDay(dateString);
return year + "-12-" + endDay + " 23:59:59";
}

/*获取某个日期是当年中的第几天*/
getDayOfYear (time) {
var firstDayYear = this.getFirstDayOfYear(time);
var numSecond = (new Date(time).getTime() - new Date(firstDayYear).getTime())/1000;
return Math.ceil(numSecond/(24*3600));
}

/*获取某个日期在这一年的第几周*/
getDayOfYearWeek (time) {
var numdays = this.getDayOfYear(time);
return Math.ceil(numdays / 7);
}
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