vue el-date-picker 开始日期不能大于结束日期

HTML

      <el-form-item label="开始日期" prop="startTime">
        <el-date-picker clearable v-model="form.startTime" type="date" value-format="yyyy-MM-dd" :picker-options="pickerOptionsStartq" placeholder="请选择开始时间">
        </el-date-picker>
      </el-form-item>
      <el-form-item label="结束日期" prop="endTime">
        <el-date-picker clearable v-model="form.endTime" type="date" value-format="yyyy-MM-dd" :picker-options="pickerOptionsEndq" placeholder="请选择结束时间">
        </el-date-picker>
      </el-form-item>

JS:  (写在data内)

满足开始日期不能大于结束日期,并且****几种情况如下:

开始日期不能大于结束日期

      pickerOptionsStart: {
        disabledDate: time => {
          if (this.form.endTime) {
            return (
              time.getTime() >
              new Date(this.form.endTime).getTime() -
                1 * 24 * 60 * 60 * 1000
            );
          }
        }
      },
      pickerOptionsEnd: {
        disabledDate: time => {
          return (
            time.getTime() <
            new Date(this.form.startTime).getTime() -
              8.64e7 +
              1 * 24 * 60 * 60 * 1000
          );
        }
      },

开始日期不能大于结束日期 --选择今天以后的日期--今天可选 

      pickerOptionsStart: {
        disabledDate: time => {
          if (this.form.endTime) {
            return (
              time.getTime() < Date.now() - 8.64e7 ||
              time.getTime() >
                new Date(this.form.endTime).getTime() - 1 * 24 * 60 * 60 * 1000
            );
          }
          return time.getTime() < Date.now() - 8.64e7;
        }
      },
      pickerOptionsEnd: {
        disabledDate: time => {
          return (
            time.getTime() < Date.now() - 8.64e7 ||
            time.getTime() <
              new Date(this.form.startTime).getTime() -
                8.64e7 +
                1 * 24 * 60 * 60 * 1000
          );
        }
      },

开始日期不能大于结束日期--选择今天以后的日期--今天不可选

      pickerOptionsStart: {
        disabledDate: time => {
          if (this.form.endTime) {
            return (
              time.getTime() < Date.now() - 8.64e7 ||
              time.getTime() >
                new Date(this.form.endTime).getTime() - 1 * 24 * 60 * 60 * 1000
            );
          }
          return time.getTime() < Date.now();
        }
      },
      pickerOptionsEnd: {
        disabledDate: time => {
          return (
            time.getTime() < Date.now() ||
            time.getTime() <
              new Date(this.form.startTime).getTime() -
                8.64e7 +
                1 * 24 * 60 * 60 * 1000
          );
        }
      },

开始日期不能大于结束日期--选择今后一年内的日期

      pickerOptionsStart: {
        disabledDate: time => {
          if (this.form.endTime) {
            return (
              time.getTime() <
              new Date(this.form.endTime).getTime() - 365 * 24 * 60 * 60 * 1000
            );
          }
        }
      },
      pickerOptionsEnd: {
        disabledDate: time => {
          return (
            time.getTime() >
            new Date(this.form.startTime).getTime() +
              8.64e7 +
              365 * 24 * 60 * 60 * 1000
          );
        }
      },

只有一个日期框, 要求只能选今天以后的

      pickerOptions: {
        disabledDate: time => {
          // return time.getTime() < Date.now() - 8.64e7; // 今天可选
          return time.getTime() < Date.now();//今天不可选
        }
      },