(JavaScript) 时间转为几天前、几小时前、几分钟前

// 时间戳转多少分钟之前
getDateDiff(dateTimeStamp) {
    // 时间字符串转时间戳
    var timestamp = new Date(dateTimeStamp).getTime();

    var minute = 1000 * 60;
    var hour = minute * 60;
    var day = hour * 24;
    var halfamonth = day * 15;
    var month = day * 30;
    var year = day * 365;
    var now = new Date().getTime();
    var diffValue = now - timestamp;
    var result;
    if (diffValue < 0) {
        return;
    }
    var yearC = diffValue / year;
    var monthC = diffValue / month;
    var weekC = diffValue / (7 * day);
    var dayC = diffValue / day;
    var hourC = diffValue / hour;
    var minC = diffValue / minute;
    if (yearC >= 1) {
        result = "" + parseInt(yearC) + "年前";
    } else 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;
},