js时间-公共方法

男娘i 2022-11-10 10:58 232阅读 0赞

Date.prototype.format = function(format = 'yy-mm-dd HH:ii:ss') { 
    	var o = { 
    		"y+": this.getFullYear(),
    		"m+": this.getMonth() + 1,
    		"d+": this.getDate(), //day
    		"x+": '日一二三四五六'.split('')[this.getDay()],
    		"H+": this.getHours(),
    		"h": (this.getHours()>12?'下午':'上午') + this.getHours()%12,
    		"i+": this.getMinutes(),
    		"s+": this.getSeconds(),
    		"S": this.getMilliseconds()
    	}
    	for (var k in o) { 
    		var reg = new RegExp("(" + k + ")")
    		if (reg.test(format)) { 
    			var v = o[k] + ''
    			if(v.length==1 && RegExp.$1.length < 4 && RegExp.$1.length > 1) v = '0' + v
    			format = format.replace(reg, v)
    		}
    	}
    	return format
    }
    
    Date.prototype.getNextMonth = function(gap = 1) { 
    	const date = new Date(this.getFullYear(), this.getMonth() + gap)
    	return date
    }
    Date.prototype.getMonthEnd = function() { 
    	return new Date(this.getNextMonth() - 1e3)
    }
    
    Date.prototype.getNextDay = function(gap = 1) { 
    	const date = new Date(this.getFullYear(), this.getMonth(), this.getDate() + gap)
    	return date
    }
    Date.prototype.getToday = function() { 
    	return this.format('yy-mm-dd 00:00:00').toDate()
    }
    Date.prototype.getDayEnd = function() { 
    	return new Date(this.getToday()*1 + 86400e3 - 1e3)
    }
    Date.prototype.toISO8String = function() { 
    	return this.format('y-m-d HH:ii:ss')
    }
    
    String.prototype.toDate = function() { 
        const arr = this.split(/\D+/);
    	if(arr.length < 2) return null;
    	for(const idx in arr) { 
    		arr[idx] = arr[idx]*1
    	}
        arr[1] = arr[1]*1 - 1;
        return new Date(...arr)
    }
    
    String.prototype.toNiceTime = function(now, mode = 1) { 
    	const date = this.toString().toDate()
    	// console.log(now, date)
    	const second = (now - date)/1e3 | 0
    	if((mode == 1 || mode == 11) && second > 0) { 
    		if(second < 10) return '刚刚'
    		if(second < 60) return (second - second%10) + '秒前'
    		if(second < 60*60) return Math.floor(second/60) + '分钟前'
    		if(mode == 11) { 
    			if(second < 86400) return Math.floor(second/3600) + '小时前'
    			return Math.floor(second/86400) + '天前'
    		}
    	}
    	let datePart = date.format('yy-mm-dd')
    	const timePart = date.format('HH:ii')
    	const today = now.format('y-m-d').toDate()
    	if(date.getFullYear() == now.getFullYear()) datePart = date.format('m月d日')
    	if(mode == 2) { 
    		return datePart
    	}
    	if(second < 0) { 
    		const nextDay = now.getNextDay()
    		if(date >= nextDay && date <= nextDay.getDayEnd()) datePart = '明天'
    	}
    	else if(date >= today) datePart = '今天'
    	else if(date >= today.getNextDay(-1)) datePart = '昨天'
    	return datePart + ' ' + timePart
    }
    
    String.prototype.cutStr = function(pre = 100, trail = 0) { 
    	if(this.length <= pre + trail) return this
    	let txt = this.substr(0, pre) + '...'
    	if(trail) txt += this.substr(-trail)
    	return txt
    }
    
    Array.sortArrayBy = function(arr, key, isDesc) { 
    	arr.sort((a, b) => { 
    		return (isDesc ? -1 : 1) * (a[key] - b[key])
    	})
    	return arr
    }
    // Array.prototype.sortBy 遍历时需增加判断 arr.hasOwnProperty(key)