element-ui日期选择器datepicker限制最大选择日期范围

如图，需求为最多选择范围为七天

 <el-date-picker
        v-model="pickerDate"
        type="daterange"
        :picker-options="pickerOptions"
        @change="handlePickerDate"
        range-separator="至"
        format="yyyy-MM-dd"
        value-format="timestamp"
        start-placeholder="开始日期"
        end-placeholder="结束日期"
        align="right">
  </el-date-picker>

 timeOptionRange:null,

pickerOptions: {
        onPick :time =>{
              this.searchList.timeOptionRange = time.minDate
        },
        disabledDate :time =>{
              let timeOptionRange = this.searchList.timeOptionRange
              let seven = 3600 * 1000 * 24 * 6
              if(timeOptionRange){
                // /*选择的日期 与 当前日期 小于7天*/
                let current =new Date(new Date().toLocaleDateString()) - timeOptionRange.getTime()
                return (time.getTime() > timeOptionRange.getTime()+ (current < seven?current:seven) ||
                  time.getTime() < timeOptionRange.getTime()-seven)
              }else {
                return time.getTime() > Date.now();
              }
            }]
  },             

handlePickerDate(e){
  if(!e){
    this.timeOptionRange = null
  }
},