修改人员信息年龄排序，按照年月进行排序

oa-ui/src/views/oa/staff/index.vue

           <el-table-column label="年龄" align="center" key="age" prop="age" v-if="columns[1].visible" sortable
             :sort-method="sortAge">
             <template slot-scope="scope">
-              {{ getAgeByIdCard(scope.row.idCard) }}
+              {{ String(getAgeByIdCard(scope.row.idCard)).slice(0,2) }}
             </template>
           </el-table-column>
           <el-table-column label="性别" align="center" key="sex" prop="sex" v-if="columns[2].visible"
       }
     },
     getAgeByIdCard(idCard) {
-      const sexAndAge = {}
-      //获取用户身份证号码
-      const userCard = idCard
-      //如果用户身份证号码为undefined则返回空
-      if (!userCard) {
-        return ''
+      const birthStr = idCard.substring(6, 14);
+      const birthYear = parseInt(birthStr.substring(0, 4), 10);
+      const birthMonth = parseInt(birthStr.substring(4, 6), 10) - 1; // 月份从0开始
+      const birthDay = parseInt(birthStr.substring(6, 8), 10);
+      // 创建日期对象
+      const birthDate = new Date(birthYear, birthMonth, birthDay);
+      const now = new Date();
+      // 基础年龄计算
+      let age = now.getFullYear() - birthDate.getFullYear();
+      // 判断是否已过生日
+      const monthDiff = now.getMonth() - birthDate.getMonth();
+      if (monthDiff < 0 || (monthDiff === 0 && now.getDate() < birthDate.getDate())) {
+        age--;
       }
-      // 获取出生日期
-      const yearBirth = userCard.substring(6, 10)
-      const monthBirth = userCard.substring(10, 12)
-      const dayBirth = userCard.substring(12, 14)
-      // 获取当前年月日并计算年龄
-      const myDate = new Date()
-      const monthNow = myDate.getMonth() + 1
-      const dayNow = myDate.getDate()
-      let age = myDate.getFullYear() - yearBirth
-
-      if (monthNow < monthBirth || (monthNow == monthBirth && dayNow < dayBirth)) {
-        age--
+      // 计算上次生日日期
+      let lastBirthday = new Date(now.getFullYear(), birthDate.getMonth(), birthDate.getDate());
+      if (now < lastBirthday) {
+        lastBirthday.setFullYear(lastBirthday.getFullYear() - 1);
       }
-      // 得到年龄
-      sexAndAge.age = age
-      return sexAndAge.age
+      // 计算时间比例
+      const nextBirthday = new Date(lastBirthday.getFullYear() + 1, lastBirthday.getMonth(), lastBirthday.getDate());
+      const daysInYear = (nextBirthday - lastBirthday) / (1000 * 60 * 60 * 24);
+      const daysPassed = (now - lastBirthday) / (1000 * 60 * 60 * 24);
+      return Number((age + (daysPassed / daysInYear)).toFixed(4));
     },
     formatArrayToString(str, splitStr) {
       let newStr = "";