<el-form-item label="上架时间" required="required">
            <el-form
              :model="courseForm"
              ref="unmountFormRef"
              inline
              style="text-align: left"
              label-position="left"
              :rules="sjtimeRules"
            >
              <el-form-item
                prop="beginTime"
                style="width: 37%; margin-right: 0px"
              >
                <el-date-picker
                  v-model="courseForm.beginTime"
                  type="datetime"
                  placeholder="选择日期时间"
                  value-format="YYYY-MM-DD HH:mm"
                  format="YYYY-MM-DD HH:mm"
                  data-format="YYYY-MM-DD HH:mm"
                  @change="signStartTimeChange"
                  :default-time="defaultBeginTime"
                />
              </el-form-item>

              <span style="margin-left: 10px; margin-right: 10px">至</span>
              <el-form-item style="width: 37%">
                <el-date-picker
                  v-model="courseForm.endTime"
                  type="datetime"
                  placeholder="选择日期时间"
                  value-format="YYYY-MM-DD HH:mm"
                  format="YYYY-MM-DD HH:mm"
                  data-format="YYYY-MM-DD HH:mm"
                  :disabled-date="endPickerOptions"
                  @change="signEndTimeChange"
                  :default-time="defaultEndTime"
                />
              </el-form-item>
            </el-form>
          </el-form-item>

element中添加这三行都分别去掉秒ss

       value-format="YYYY-MM-DD HH:mm"
       format="YYYY-MM-DD HH:mm"
       data-format="YYYY-MM-DD HH:mm"

默认时间的时分00:00修改12：00

js
const defaultEndTime = new Date(2000, 1, 1, 12, 0, 0);
const defaultBeginTime = new Date(2000, 1, 1, 12, 0, 0);