js获取时间函数扩展

<script type="text/javascript">
  <!--
	//---------------------------------------------------
	// 将指定的number值添加到日期
	// interval:s（秒）m（分）h（小时）d（天）w（周） q（季度） M（月）y (年)
	// number:数值
	//---------------------------------------------------
	Date.prototype.Add = function(interval, number) {
		switch (interval) {
			case 's': return new Date(Date.parse(this) + (1000 * number));
			case 'm': return new Date(Date.parse(this) + (60000 * number));
			case 'h': return new Date(Date.parse(this) + (3600000 * number));
			case 'd': return new Date(Date.parse(this) + (86400000 * number));
			case 'w': return new Date(Date.parse(this) + ((86400000 * 7) * number));
			case 'M': return new Date(this.getFullYear(), (this.getMonth()) + number, this.getDate());
			case 'q': return new Date(this.getFullYear(), (this.getMonth()) + number * 3, this.getDate());
			case 'y': return new Date((this.getFullYear() + number), this.getMonth(), this.getDate());
		}
	}
	Date.prototype.AddSecond = function(number) { return this.Add("s", number); }
	Date.prototype.AddMinute = function(number) { return this.Add("m", number); }
	Date.prototype.AddHour = function(number) { return this.Add("h", number); }
	Date.prototype.AddDay = function(number) { return this.Add("d", number); }
	Date.prototype.AddWeek = function(number) { return this.Add("w", number); }
	Date.prototype.AddMonth = function(number) { return this.Add("M", number); }
	Date.prototype.AddQuarter = function(number) { return this.Add("q", number); }
	Date.prototype.AddYear = function(number) { return this.Add("y", number); }
  //-->
  alert(new Date().AddDay(1));
  </script>