vue element-ui el-date-picker限制选择时间为当天之前的代码

<el-date-picker
 v-model="firstdate"
 :picker-options="pickerOptions0"
 type="daterange"
 range-separator="至"
 start-placeholder="开始时间"
 end-placeholder="结束时间"
 style="width:300px"
 ></el-date-picker>

data：{
 return{
  pickerOptions0: {
  disabledDate(time) {
   return time.getTime() > Date.now() - 8.64e6
  }
 }, 
}