需求：

     获取当前一周的时间，用于展示一周的数据；

export default {
          
  data: () => ({
       msg: 'Welcome to Your Vue.js App',
       week:[],
   }),
   created () {
      let data=[]
      for(let i=6;i>=0;i--){
            data.push(this.getWeek(-i))
      }
       this.week=data;
    },
  methods: {
      getWeek (day) {
          var today = new Date();
          var targetday_milliseconds=today.getTime() + 1000*60*60*24*day;
          today.setTime(targetday_milliseconds);
          var tYear = today.getFullYear();
          var tMonth = today.getMonth();
          var tDate = today.getDate();
          tMonth = this.doHandleMonth(tMonth + 1);
          tDate =  this.doHandleMonth(tDate);
          return tYear+"-"+tMonth+"-"+tDate;
      },
      doHandleMonth(month){
         var m = month;
         if(month.toString().length == 1){
            m = "0" + month;
         }
         return m;
      },
  }
}

end;