主子表：同步三种模式的代码

src/views/infra/demo03/DemoStudentContactForm.vue

@@ -0,0 +1,89 @@
+<template>
+  <el-form
+    ref="formRef"
+    :model="formData"
+    :rules="formRules"
+    label-width="0px"
+    v-loading="formLoading"
+    :inline-message="true"
+  >
+    <el-table :data="formData" class="-mt-10px">
+      <el-table-column label="序号" type="index" width="100" />
+      <el-table-column label="名字" prop="name" width="300">
+        <template #default="row">
+          <el-form-item class="mb-0px!">
+            <el-input v-model="row.name" placeholder="请输入名字" />
+          </el-form-item>
+        </template>
+      </el-table-column>
+      <el-table-column label="手机号码">
+        <template #default="{ row, $index }">
+          <el-form-item :prop="`${$index}.mobile`" :rules="formRules.mobile" class="mb-0px!">
+            <el-input type="number" placeholder="输入手机号码" v-model="row.mobile" />
+          </el-form-item>
+        </template>
+      </el-table-column>
+      <el-table-column align="center" fixed="right" label="操作" width="60">
+        <template #default="{ $index }">
+          <el-button @click="handleDelete($index)" link>—</el-button>
+        </template>
+      </el-table-column>
+    </el-table>
+  </el-form>
+  <el-row justify="center" class="mt-3">
+    <el-button @click="handleAdd" round>+ 添加联系人</el-button>
+  </el-row>
+</template>
+<script setup lang="ts">
+const props = defineProps<{
+  studentId: undefined // 学生编号
+}>()
+const formLoading = ref(false) // 表单的加载中
+const formData = ref([])
+const formRules = reactive({
+  mobile: [required]
+})
+const formRef = ref() // 表单 Ref
+
+/** 监听主表的关联字段的变化，加载对应的子表数据 */
+watch(
+  () => props.studentId,
+  (val) => {
+    if (val) {
+      formData.value = [
+        {
+          name: '芋艿',
+          mobile: '15601691300'
+        }
+      ]
+    } else {
+      formData.value = []
+    }
+  },
+  { immediate: true }
+)
+
+/** 新增按钮操作 */
+const handleAdd = () => {
+  formData.value.push({
+    name: '土豆'
+  })
+}
+
+/** 删除按钮操作 */
+const handleDelete = (index) => {
+  formData.value.splice(index, 1)
+}
+
+/** 表单校验 */
+const validate = () => {
+  return formRef.value.validate()
+}
+
+/** 表单值 **/
+const getData = () => {
+  return formData.value
+}
+
+defineExpose({ validate, getData })
+</script>