this.listQuery.Date = new Date().toISOString().substr(0, 10);

<el-date-picker v-model="listQuery.Date" format="yyyy-MM-dd" value-format="yyyy-MM-dd" type="date" placeholder="选择日期" @change="getList()">
      </el-date-picker>


this.listQuery.Date = new Date().toISOString().substr(0, 10);