js 根据指定日期格式化输出（ 刚刚，几分钟前，几小时前，今天，标准日期）

代码如下：

function getDateStr(stringTime) {
    let str = stringTime;
    //将字符串转换成时间格式
    let timePublish = new Date(str);
    let timeNow = new Date();
    let minute = 1000 * 60;
    let hour = minute * 60;
    let day = hour * 24;
    let month = day * 30;
    let year = month * 12;
    let diffValue = timeNow - timePublish;
    //let diffMonth = diffValue / month;
    //let diffWeek = diffValue / (7 * day);
    let diffDay = diffValue / day;
    let diffHour = diffValue / hour;
    let diffMinute = diffValue / minute;
    //let diffYear = diffValue / year;
    let result = null
    if (diffValue < 0) {
        result = "刚刚";
    } else if (diffHour > 1 && diffHour < 3) {
        result = parseInt(diffHour) + "小时前";
    } else if (diffMinute > 1 && diffMinute < 60 ) {
        result = parseInt(diffMinute) + "分钟前";
    } else if (diffHour >= 3 && diffDay < 1) {
        result = "今天";
    } else {
        result = getJsDateTime(stringTime);
    }
    return result;
 }

依赖方法getJsDateTime：

function getJsDateTime(dateStr) {

    if ((dateStr == null) ||(dateStr == ""))
    {
        return "";
    } else {
        var date = new Date(dateStr);
        return dateFtt("yyyy-MM-dd hh:mm:ss",date);
    }
}

依赖方法dateFtt：

function dateFtt(fmt,date) {

    var o = {
        "M+" : date.getMonth()+1,                 //月份
        "d+" : date.getDate(),                    //日
        "h+" : date.getHours(),                   //小时
        "m+" : date.getMinutes(),                 //分
        "s+" : date.getSeconds(),                 //秒
        "q+" : Math.floor((date.getMonth()+3)/3), //季度
        "S"  : date.getMilliseconds()             //毫秒
    };
    if(/(y+)/.test(fmt))
        fmt=fmt.replace(RegExp.$1, (date.getFullYear()+"").substr(4 - RegExp.$1.length));
    for(var k in o)
        if(new RegExp("("+ k +")").test(fmt))
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
    return fmt;
}

测试：

      console.log("现在===", getJsDateTime(new Date()));
      console.log("2023-12-11 11:40:00========", getDateStr('2023-12-11 11:40:00'));
      console.log("2023-12-11 11:00:00========", getDateStr('2023-12-11 11:00:00'));
      console.log("2023-12-11 10:00:00========", getDateStr('2023-12-11 10:00:00'));
      console.log("2023-12-11 05:00:00========", getDateStr('2023-12-11 05:00:00'));

效果：