vue.js客服系统实时聊天项目开发（十三）日期缩短展示，同一天只展示时秒，同一年展示月日小时秒

//缩短时间
function shortTime(t){
    let time=new Date(t);
    let today = new Date();
    let todayYear = today.getFullYear();
    let todayMonth = today.getMonth()+1;
    let todayDate = today.getDate();

    let targetYear = time.getFullYear();
    let targetMonth = time.getMonth()+1;
    let targetDate = time.getDate();
    let targetHour = time.getHours();
    let targetMinutes = time.getMinutes();
    let targetSeconds = time.getSeconds();
    // 同一天，只显示小时、分钟、秒
    if (todayYear === targetYear && todayMonth === targetMonth && todayDate === targetDate) {
        if (targetHour < 10) {
            targetHour = "0" + targetHour;
        }
        if (targetMinutes < 10) {
            targetMinutes = "0" + targetMinutes;
        }
        if (targetSeconds < 10) {
            targetSeconds = "0" + targetSeconds;
        }
        return targetHour + ":" + targetMinutes + ":" + targetSeconds;
    }
    // 同一年，只显示月日等
    if (todayYear === targetYear) {

        if (targetMonth < 10) {
            targetMonth = "0" + targetMonth;
        }
        if (targetDate < 10) {
            targetDate = "0" + targetDate;
        }
        if (targetHour < 10) {
            targetHour = "0" + targetHour;
        }
        if (targetMinutes < 10) {
            targetMinutes = "0" + targetMinutes;
        }
        if (targetSeconds < 10) {
            targetSeconds = "0" + targetSeconds;
        }
        return `${targetMonth}-${targetDate} `+targetHour + ":" + targetMinutes + ":" + targetSeconds;
    }
    return t;
}