效果图下：

<template><div class="container"><el-tableref="multipleTable"id="multipleTable":data="person.tableData"@cell-mouse-enter="cellEnter"@cell-mouse-leave="cellLeave"@selection-change="handleSelectionChange"><el-table-column type="selection" width="50" align="center"><template #default="{ row, $index }"><!-- 复选框显示：通过移入事件添加id判断 || 已经勾选了的复选框 --><divv-if="person.columnCheckedId == row.id || person.checkedList[$index]"><el-checkboxv-model="person.checkedList[$index]"></el-checkbox></div><!-- 序号显示：通过下标显示 --><span v-else>{{ $index + 1 }}</span></template></el-table-column><el-table-column prop="name" label="姓名"> </el-table-column><el-table-column prop="age" label="性别"> </el-table-column><el-table-column prop="six" label="年龄"> </el-table-column></el-table></div>
</template>

<script setup>
import { computed, reactive, ref } from "vue";
const person = reactive({columnCheckedId: "",tableData: [{ name: "123", id: 1, age: 10, six: "男" },{ name: "123", id: 2, age: 20, six: "男" },{ name: "123", id: 3, age: 330, six: "女" },],multipleSelection: [], //全选checkedList: [], //table多选选中数据
});
// 全选
function handleSelectionChange(val) {person.multipleSelection = val;if (person.multipleSelection.length == person.tableData.length) {person.multipleSelection.forEach((item, index) => {person.checkedList[index] = true;console.log(person.checkedList[index]);});}if (person.multipleSelection.length == 0) {person.checkedList = [];}
}
//移入当前行
function cellEnter(row) {person.columnCheckedId = row.id;
}
// 移出当前行
function cellLeave(row) {person.columnCheckedId = "";
}
</script>