js的常用封装函数库之Date操作

不念不忘少年蓝@ 2022-01-28 23:55 240阅读 0赞

**js的常用封装函数库之Date日期的操作**

/* * 函数功能：Date */
    
    class DateFn { 
        /** * 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 && year%100==0 && year%400==0) || (year%4==0 && year%100!=0) ? 28 : 29
            } 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);
        }
    
    }