vue js 判断时间日期是否为今天昨天明天

				date可以为任何日期
				if (new Date(date).getDate() === new Date().getDate()) {
					      this.time_str = "今天";
				} else if (new Date(date).getDate() === (new Date().getDate() - 1)) {
						 this.time_str = "昨天";
				} else if (new Date(date).getDate() === (new Date().getDate() + 1)) {
						 this.time_str = "明天";
				} else if (new Date(date).getDate() < new Date().getDate()) {
						 this.time_str = "过去";
				}