js获取时间(本周、本季度、本月)

 封装成js文件

var now = new Date(); // 当前日期
var nowDayOfWeek = now.getDay(); // 今天本周的第几天
var nowDay = now.getDate(); // 当前日
var nowMonth = now.getMonth(); // 当前月
var nowYear = now.getYear(); // 当前年
nowYear += (nowYear < 2000) ? 1900 : 0;

var DateUtil = {
	/**
	 * 获得当前日期
	 * 
	 * @returns
	 */
	getNowDay : function() {
		return this.formatDate(new Date());
	},
	/**
	 * 获得本周的开始时间
	 * 
	 * @returns
	 */
	getStartDayOfWeek : function() {
		var day = nowDayOfWeek || 7;
		return this.formatDate(new Date(now.getFullYear(), nowMonth, nowDay + 1 - day));
	},
	/**
	 * 获得本周的结束时间
	 * 
	 * @returns
	 */
	getEndDayOfWeek : function() {
		var day = nowDayOfWeek || 7;
		return this.formatDate(new Date(now.getFullYear(), nowMonth, nowDay + 7 - day));
	},
	/**
	 * 获得本月的开始时间
	 * 
	 * @returns
	 */
	getStartDayOfMonth : function() {
		var monthStartDate = new Date(nowYear, nowMonth, 1);
		return this.formatDate(monthStartDate);
	},
	/**
	 * 获得本月的结束时间
	 * 
	 * @returns
	 */
	getEndDayOfMonth : function() {
		var monthEndDate = new Date(nowYear, nowMonth, this.getMonthDays());
		return this.formatDate(monthEndDate);
	},
	/**
	 * 获得本月天数
	 * 
	 * @returns
	 */
	getMonthDays : function() {
		var monthStartDate = new Date(nowYear, nowMonth, 1);
		var monthEndDate = new Date(nowYear, nowMonth + 1, 1);
		var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
		return days;
	},
	/**
	 * @param 日期格式化
	 * @returns {String}
	 */
	formatDate : function(date) {
		var myyear = date.getFullYear();
		var mymonth = date.getMonth() + 1;
		var myweekday = date.getDate();

		if (mymonth < 10) {
			mymonth = "0" + mymonth;
		}
		if (myweekday < 10) {
			myweekday = "0" + myweekday;
		}
		return (myyear + "-" + mymonth + "-" + myweekday);
	}
};