js时间转化为几天前,几小时前，几分钟前

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;