成功TypeError: this.xxx is undefined解决

<fieldset class="jzs-border">
      <legend class="jzs-title">
        男用药史({{ this.ListMedicationHistoryMan.length }})
      </legend>
      <div class="align-right" style="margin-bottom: 10px">
        <el-button
          type="primary"
          @click="AddrowMedicationHistoryMan(ListMedicationHistoryMan)"
          >新建行</el-button
        >
        <el-button type="primary" @click="AddBatchMedicationHistoryMan()"
          >保存</el-button
        >
      </div>
      <el-table
        :data="ListMedicationHistoryMan"
        element-loading-text="Loading"
        border
        fit
        highlight-current-row
        header-cell-style="color:#909399;font-weight:bold;"
      >
        <el-table-column prop="TakeTime" label="服用时间" align="center">
          <template scope="scope">
            <el-date-picker
              v-model="scope.row.TakeTime"
              type="datetime"
              value-format="yyyy-MM-dd HH:mm:ss"
              placeholder="选择日期时间"
              size="mini"
            ></el-date-picker>
          </template>
        </el-table-column>
        <el-table-column prop="DrugCategory" label="药品类别" align="center">
          <template scope="scope">
            <el-select
              v-model="scope.row.DrugCategory"
              placeholder=""
              size="mini"
            >
              <el-option
                v-for="item in DrugCategoryOptions"
                :key="item.DrugCategoryValue"
                :label="item.DrugCategoryValue"
                :value="item.DrugCategoryValue"
              ></el-option>
            </el-select>
          </template>
        </el-table-column>
        <el-table-column prop="DrugName" label="药品名称" align="center">
          <template scope="scope">
            <el-input size="mini" v-model="scope.row.DrugName"></el-input>
          </template>
        </el-table-column>
        <el-table-column prop="Duration" label="持续时间" align="center">
          <template scope="scope">
            <el-input size="mini" v-model="scope.row.Duration"></el-input>
          </template>
        </el-table-column>
        <el-table-column prop="Dose" label="剂量" align="center">
          <template scope="scope">
            <el-input
              type="text"
              oninput="value=value.replace(/[^\d]/g,'')"
              maxlength="9"
              v-model="scope.row.Dose"
              placeholder=""
              clearable
              size="mini"
            ></el-input>
          </template>
        </el-table-column>
        <el-table-column prop="remark" label="备注" align="center">
          <template scope="scope">
            <el-input size="mini" v-model="scope.row.remark"></el-input>
          </template>
        </el-table-column>
        <el-table-column label="操作" align="center" min-width="100px">
          <template slot-scope="scope">
            <el-button
              type="primary"
              icon="el-icon-edit"
              @click="AddrowMedicationHistoryMan(ListMedicationHistoryMan)"
              circle
              size="mini"
            ></el-button>
            <el-button
              type="danger"
              icon="el-icon-delete"
              @click="
                DelrowMedicationHistoryMan(scope.$index, ListMedicationHistoryMan)
              "
              circle
              size="mini"
            ></el-button>
          </template>
        </el-table-column>
      </el-table>
    </fieldset>
<script>
import { mapGetters } from "vuex";
import {
  AddBatchContactHistory,
  GetListContactHistory,
} from "@/api/ContactHistory";
import {
  AddBatchMedicationHistory,
  GetListMedicationHistory,
} from "@/api/MedicationHistory";
import {
  getList_Name
} from "@/api/ContactHistorySpecificLinks";
export default {
  filters: {},
  data() {
    return {
      ListContactHistoryMan: [],
      ListMedicationHistoryMan: [],
      EggDevelopementDisorderNumber: "",
      ContactWithSpecialTypesOfWorkOptions: [
        { ContactWithSpecialTypesOfWorkValue: "美容、美发" },
        { ContactWithSpecialTypesOfWorkValue: "农药" },
        { ContactWithSpecialTypesOfWorkValue: "皮革、皮毛加工" },
        { ContactWithSpecialTypesOfWorkValue: "鞋帽、服装加工" },
        { ContactWithSpecialTypesOfWorkValue: "印刷、造纸厂" },
        { ContactWithSpecialTypesOfWorkValue: "颜料、涂料、油漆" },
        { ContactWithSpecialTypesOfWorkValue: "其他" },
      ],
      DrugCategoryOptions: [
        { DrugCategoryValue: "甲状腺相关药物" },
        { DrugCategoryValue: "溴隐亭" },
        { DrugCategoryValue: "保健品" },
        { DrugCategoryValue: "维生素A" },
        { DrugCategoryValue: "DHEA" },
        { DrugCategoryValue: "避孕药" },
        { DrugCategoryValue: "雌孕激素" },
        { DrugCategoryValue: "减肥药" },
        { DrugCategoryValue: "中药" },
        { DrugCategoryValue: "糖皮质激素" },
        { DrugCategoryValue: "抗抑郁药" },
        { DrugCategoryValue: "维甲酸" },
        { DrugCategoryValue: "其他药物" },
      ],
      SpecificLinksOptions:[],
    };
  },
  mounted() {
    if (!this.LZBaseSession.EggDevelopementDisorderNumber) {
      this.$router.push("/TopMain/CaseSel");
      return;
    }
    this.EggDevelopementDisorderNumber = "LZ0015"; //临时
    this.EggDevelopementDisorderNumber = this.LZBaseSession.EggDevelopementDisorderNumber;
    this.fetchData_SpecificLinks();
    this.FetchDataContactHistoryMan();
    this.FetchDataMedicationHistoryMan();
  },
  computed: {
    ...mapGetters(["LZBaseSession", "name"]),
  },
  methods: {
    //用药史部分
    AddrowMedicationHistoryMan(tableData, event) {
      tableData.push({
        TakeTime: this.moment(new Date()).utcOffset(480).format( 'YYYY-MM-DD HH:mm:ss'),
      });
    },
    DelrowMedicationHistoryMan(index, rows) {
      rows.splice(index, 1);
    },
    FetchDataMedicationHistoryMan() {
      let param = {
        EggDevelopementDisorderNumber: this.EggDevelopementDisorderNumber,
        Sex:"男",
      };
      GetListMedicationHistory(param).then((response) => {
        debugger;
        this.ListMedicationHistoryMan = response.Data;
      });
    },
    AddBatchMedicationHistoryMan() {
      //添加上卵障号
      this.ListMedicationHistoryMan.forEach((element) => {
        element.EggDevelopementDisorderNumber = this.EggDevelopementDisorderNumber;
        element.AddMan = this.name;
        element.Sex="男";
      });
      let params = this.ListMedicationHistoryMan;
      AddBatchMedicationHistory(params).then((res) => {
        this.$message({
          type: "info",
          message: res.Message,
        });
      });
    },
  },
};
</script>
 调用这个FetchDataMedicationHistoryMan，提示TypeError: this.ListMedicationHistoryMan is undefined
多次检查，前端没有问题，这个变量也已经定义了，最后发现原来是后台接口出现了问题