vue+element踩坑记-动态设置表头（以时间作为表头）

<template v-for="(col,index) in base_title">
            <el-table-column :label="col.label">
              <el-table-column
                prop="morning"
                label="上午"
                width="120">
              </el-table-column>
              <el-table-column
                prop="afternoon"
                label="下午"
                width="120">
              </el-table-column>
            </el-table-column>
          </template>

		 /**
         * @change_days 改变table的表头数量
         */
        change_days(){
             let that = this;
             that.base_title = [];
             let Max_length = that.value;
             console.log(Max_length )
             for(let i = 0;i<Max_length;i++){
               that.value_date =  that.value_dateVal;
                 let param = {
                     label : that.getDay(i)+""+(that.getWeek(that.getDay(i).toString())),
                     prop : that.getDay(i)
                 };
               that.base_title.push(param);
             }
             console.info(that.base_title);
        },
        /**
         * @getDay 获取日期
         * @doHandleMonth
         * @getWeek 获取当前星期
         */
        getDay(day){
          let that = this;
          let value_day = new Date();
          let target_day_milliseconds= value_day.getTime() + 1000*60*60*24*day;
          value_day.setTime(target_day_milliseconds); //注意，这行是关键代码
          let tYear = value_day.getFullYear();
          let tMonth = value_day.getMonth();
          let tDate = value_day.getDate();
          tMonth = that.doHandleMonth(tMonth + 1);
          tDate = that.doHandleMonth(tDate);
          return tYear+"-"+tMonth+"-"+tDate;
        },
        getWeek(dateString){
          let weekArray = ["(星期日)", "(星期一)", "(星期二)", "(星期三)", "(星期四)", "(星期五)", "(星期六)"];
          return weekArray[new Date(dateString).getDay()];
        },
        doHandleMonth(month){
          let m = month;
          if(month.toString().length === 1){
            m = "0" + month;
          }
          return m;
        },