关于element中日期组件

         <el-form-item label="创建时间">
              <el-date-picker
                v-model="dateRange"
                style="width: 240px"
                value-format="yyyy-MM-dd HH:mm:ss"
                type="daterange"
                range-separator="-"
                start-placeholder="开始日期"
                end-placeholder="结束日期"
                :default-time="['00:00:00', '23:59:59']"
              ></el-date-picker>
            </el-form-item>
            
            :default-time="['00:00:00', '23:59:59']"