js获取一周的日期范围

function getWeek() {
				this.nowTime = new Date();
				this.init = function() {
					this.dayInWeek = this.nowTime.getDay();
					this.dayInWeek == 0 && (this.dayInWeek = 7);
					this.thsiWeekFirstDay = this.nowTime.getTime() - (this.dayInWeek - 1) * 86400000;
					this.thisWeekLastDay = this.nowTime.getTime() + (7 - this.dayInWeek) * 86400000;
					return this;
				};
				this.getWeekType = function(type) {
					type = ~~type;
					var firstDay = this.thsiWeekFirstDay + type * 7 * 86400000;
					var lastDay = this.thisWeekLastDay + type * 7 * 86400000;
					return this.getWeekHtml(firstDay, lastDay);
				}
				this.formateDate = function(time) {
					var newTime = new Date(time)
					var year = newTime.getFullYear();
					var month = newTime.getMonth() + 1;
					var day = newTime.getDate();
					return year + "-" + (month >= 10 ? month : "0" + month) + "-" + (day >= 10 ? day : "0" + day);
				};
				this.getWeekHtml = function(f, l) {
					return this.formateDate(f) + "至" + this.formateDate(l);
				};
			}
			var getWeek = new getWeek();
			var week = getWeek.init().getWeekType();
			console.log(week);

　　

getWeekType()这个方法如果不传参数 或者传入0，返回的是本周的日期范围，如果要下周的范围则传入1，上周的传入-1；
注：这个是从周一开始算一周的开始，周日为结束。