js 显示时间戳转化为几分钟之前多久之前方法函数

function getDateDiff(data) {
//var str = data;
//将字符串转换成时间格式
var timePublish = new Date(data);
var timeNow = new Date();
var minute = 1000 * 60;
var hour = minute * 60;
var day = hour * 24;
var month = day * 30;
var diffValue = timeNow - timePublish;
var diffMonth = diffValue / month;
var diffWeek = diffValue / (7 * day);
var diffDay = diffValue / day;
var diffHour = diffValue / hour;
var diffMinute = diffValue / minute;

if (diffValue < 0) {
alert("错误时间");
}
else if (diffMonth > 3) {
result = timePublish.getFullYear() + "-";
result += timePublish.getMonth() + "-";
result += timePublish.getDate();
alert(result);
}
else if (diffMonth > 1) {
result = parseInt(diffMonth) + "月前";
}
else if (diffWeek > 1) {
result = parseInt(diffWeek) + "周前";
}
else if (diffDay > 1) {
result = parseInt(diffDay) + "天前";
}
else if (diffHour > 1) {
result = parseInt(diffHour) + "小时前";
}
else if (diffMinute > 1) {
result = parseInt(diffMinute) + "分钟前";
}
else {
result = "刚收藏";
}
return result;
}