js时间转化为几天前,几小时前，几分钟前

http://caibaojian.com/timestamp.html

在前面一篇文章中，我们学习到了如何获取时间和怎么算出两者之间的时间差

今天看看怎么将时间戳转换为几个月前，几周前，几天前，几分钟前的形式。与上面类似通过JavaScript计算当前时间与定义的时间的对比，匹配不同时间段的值。

function getDateDiff(dateTimeStamp){
	var minute = 1000 * 60;
	var hour = minute * 60;
	var day = hour * 24;
	var halfamonth = day * 15;
	var month = day * 30;
	var now = new Date().getTime();
	var diffValue = now - dateTimeStamp;
	if(diffValue < 0){return;}
	var monthC =diffValue/month;
	var weekC =diffValue/(7*day);
	var dayC =diffValue/day;
	var hourC =diffValue/hour;
	var minC =diffValue/minute;
	if(monthC>=1){
		result="" + parseInt(monthC) + "月前";
	}
	else if(weekC>=1){
		result="" + parseInt(weekC) + "周前";
	}
	else if(dayC>=1){
		result=""+ parseInt(dayC) +"天前";
	}
	else if(hourC>=1){
		result=""+ parseInt(hourC) +"小时前";
	}
	else if(minC>=1){
		result=""+ parseInt(minC) +"分钟前";
	}else
	result="刚刚";
	return result;
}

转换标准时间为时间戳：

function getDateTimeStamp(dateStr){
 return Date.parse(dateStr.replace(/-/gi,"/"));
}