时间计算规则

mixin.js####

export const TimeFiltering = {//时间格式化
    created(){
        Date.prototype.format = function(fmt) { 
            var o = { 
               "M+" : this.getMonth()+1,                 //月份 
               "d+" : this.getDate(),                    //日 
               "h+" : this.getHours(),                   //小时 
               "m+" : this.getMinutes(),                 //分 
               "s+" : this.getSeconds(),                 //秒 
               "q+" : Math.floor((this.getMonth()+3)/3), //季度 
               "S"  : this.getMilliseconds()             //毫秒 
           }; 
           if(/(y+)/.test(fmt)) {
                   fmt=fmt.replace(RegExp.$1, (this.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; 
       }
    }
}

.vue文件####

<template>
    <div v-for="(item, index) in timeList" :key='index'>{{jisuan(item.time)}}</div>
</template>
<script>
    import {TimeFiltering} from '../mixins/mixins'
    export default {
        mixins: [TimeFiltering],
        data(){
            return {
                timeList: [
                  {time: '2018-12-01 20:24:14'},
                  {time: '2018-12-31 20:24:14'},
                  {time: '2019-1-01 20:24:14'},
                  {time: '2019-1-02 20:24:14'},
                  {time: '2019-1-03 20:24:14'}
                ]
            }
        },
        computed: {
          jisuan(){
            return function(time){
              let nowTime = new Date().getTime()
              let oldTime = new Date(time).getTime()
              let oneDay = 24*60*60*1000
              let twoDay = 2*24*60*60*1000
              let oneWeek = 7*24*60*60*1000
              let nowDay = new Date(time).getDay()
              if (nowTime - oldTime < oneDay){
                return new Date(time).format("hh:mm")
              }else if( nowTime - oldTime < twoDay){
                return '昨天'
              } else if ( nowTime - oldTime < oneWeek ){
                switch (nowDay) {
                  case 0:
                    return '星期天';
                  case 1:
                    return '星期一';
                  case 2:
                    return '星期二';
                  case 3:
                    return '星期三';
                  case 4:
                    return '星期四';
                  case 5:
                    return '星期五';
                  case 6:
                    return '星期六';
                }
              } else {
                return new Date(time).format("yyyy-MM-dd hh:mm:ss")
              }
            }
          }
        }
    }
</script>