javascript计算时间为刚刚，几秒前，几分钟前，几小时前，几天前

//字符串转换为时间戳

function getDateTimeStamp(dateStr) {

return Date.parse(dateStr.replace(/-/gi,"/"));

}

function getDateDiff(dateStr) {

var publishTime = getDateTimeStamp(dateStr)/1000,

d_seconds,

d_minutes,

d_hours,

d_days,

timeNow = parseInt(new Date().getTime()/1000),

d,

date = new Date(publishTime * 1000),

Y = date.getFullYear(),

M = date.getMonth() + 1,

D = date.getDate(),

H = date.getHours(),

m = date.getMinutes(),

s = date.getSeconds();

//小于10的在前面补0

if (M < 10) {

M = '0' + M;

}

if (D < 10) {

D = '0' + D;

}

if (H < 10) {

H = '0' + H;

}

if (m < 10) {

m = '0' + m;

}

if (s < 10) {

s = '0' + s;

}

d = timeNow - publishTime;

d_days = parseInt(d / 86400);

d_hours = parseInt(d / 3600);

d_minutes = parseInt(d / 60);

d_seconds = parseInt(d);

if (d_days > 0 && d_days < 3) {

return d_days + '天前';

} else if (d_days <= 0 && d_hours > 0) {

return d_hours + '小时前';

} else if (d_hours <= 0 && d_minutes > 0) {

return d_minutes + '分钟前';

} else if (d_seconds < 60) {

if (d_seconds <= 0) {

return '刚刚发表';

} else {

return d_seconds + '秒前';

}

} else if (d_days >= 3 && d_days < 30) {

return M + '-' + D + ' ' + H + ':' + m;

} else if (d_days >= 30) {

return Y + '-' + M + '-' + D + ' ' + H + ':' + m;

}

}