## 沐瑶 / LearningNotes

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## 代码

      /**
* dateTimeStamp是评论的发送时间   2020-01-12 20:10:15 这样的形式
* @param dateTimeStamp
* @returns {string}
*/
timeAgo(dateTimeStamp) {
let result = "";
let minute = 1000 * 60;      //把分，时，天，周，半个月，一个月用毫秒表示
let hour = minute * 60;
let day = hour * 24;
let week = day * 7;
let halfamonth = day * 15;
let month = day * 30;
let now = new Date().getTime();   //获取当前时间毫秒

dateTimeStamp = dateTimeStamp.substring(0, 18);
//必须把日期'-'转为'/'
dateTimeStamp = dateTimeStamp.replace(/-/g, '/');
let timestamp = new Date(dateTimeStamp).getTime();

let diffValue = now - timestamp;//时间差

if (diffValue < 0) {
return result;
}
let minC = diffValue / minute;  //计算时间差的分，时，天，周，月
let hourC = diffValue / hour;
let dayC = diffValue / day;
let weekC = diffValue / week;
let monthC = diffValue / month;
if (monthC >= 1 && monthC <= 3) {
result = " " + parseInt(monthC) + "月前"
} else if (weekC >= 1 && weekC <= 3) {
result = " " + parseInt(weekC) + "周前"
} else if (dayC >= 1 && dayC <= 6) {
result = " " + parseInt(dayC) + "天前"
} else if (hourC >= 1 && hourC <= 23) {
result = " " + parseInt(hourC) + "小时前"
} else if (minC >= 1 && minC <= 59) {
result = " " + parseInt(minC) + "分钟前"
} else if (diffValue >= 0 && diffValue <= minute) {
result = "刚刚"
} else {
let datetime = new Date();
datetime.setTime(dateTimeStamp);
let Nyear = datetime.getFullYear();
let Nmonth = datetime.getMonth() + 1 < 10 ? "0" + (datetime.getMonth() + 1) : datetime.getMonth() + 1;
let Ndate = datetime.getDate() < 10 ? "0" + datetime.getDate() : datetime.getDate();
let Nhour = datetime.getHours() < 10 ? "0" + datetime.getHours() : datetime.getHours();
let Nminute = datetime.getMinutes() < 10 ? "0" + datetime.getMinutes() : datetime.getMinutes();
let Nsecond = datetime.getSeconds() < 10 ? "0" + datetime.getSeconds() : datetime.getSeconds();
result = Nyear + "-" + Nmonth + "-" + Ndate
}
return result;
},