1 行多选-点击checkbox

添加一个 el-table-column，设 type 属性为 selection 即可

<template>
  <div class="box">
    <el-table :data="tableData" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" />
      <el-table-column prop="id" label="Id" width="180" />
      <el-table-column prop="name" label="Name" width="180" />
      <el-table-column prop="age" label="Age" />
    </el-table>
    <div>选择结果： {{ multipleSelection }}</div>
  </div>
</template>
<script setup lang="ts">
const tableData = [
  {
    id: 1,
    name: "张三",
    age: 10,
  },
  {
    id: 2,
    name: "李四",
    age: 11,
  },
  {
    id: 3,
    name: "王五",
    age: 12,
  },
  {
    id: 4,
    name: "赵六",
    age: 13,
  },
];
const multipleSelection = ref([]);
const handleSelectionChange = (val: []) => {
  multipleSelection.value = val;
  console.log(val);
};
</script>
<style>
.box {
  width: 600px;
}
</style>

2 行多选-点击checkbox或row

<template>
  <div class="box">
    <el-table
      ref="tableRef"
      :data="tableData"
      @selection-change="handleSelectionChange"
      @row-click="handleRowSelect"
    >
      <el-table-column type="selection" width="55" />
      <el-table-column prop="id" label="Id" width="180" />
      <el-table-column prop="name" label="Name" width="180" />
      <el-table-column prop="age" label="Age" />
    </el-table>
    <div>选择结果： {{ multipleSelection }}</div>
  </div>
</template>
<script setup lang="ts">
const tableRef = ref();
const tableData = [
  {
    id: 1,
    name: "张三",
    age: 10,
  },
  {
    id: 2,
    name: "李四",
    age: 11,
  },
  {
    id: 3,
    name: "王五",
    age: 12,
  },
  {
    id: 4,
    name: "赵六",
    age: 13,
  },
];
const multipleSelection = ref([]);
const handleSelectionChange = (val: []) => {
  multipleSelection.value = val;
  console.log(val);
};
const handleRowSelect = (row) => {
  tableRef.value!.toggleRowSelection(row, undefined);
};
</script>
<style>
.box {
  width: 600px;
}
</style>

</style>

3 行多选-点击checkbox或row,高亮上次选择或反选的行

<template>
  <div class="box">
    <el-table
      ref="tableRef"
      :data="tableData"
      highlight-current-row
      @selection-change="handleSelectionChange"
      @row-click="handleRowSelect"
    >
      <el-table-column type="selection" width="55" />
      <el-table-column prop="id" label="Id" width="180" />
      <el-table-column prop="name" label="Name" width="180" />
      <el-table-column prop="age" label="Age" />
    </el-table>
    <div>选择结果： {{ multipleSelection }}</div>
  </div>
</template>
<script setup lang="ts">
const tableRef = ref();
const tableData = [
  {
    id: 1,
    name: "张三",
    age: 10,
  },
  {
    id: 2,
    name: "李四",
    age: 11,
  },
  {
    id: 3,
    name: "王五",
    age: 12,
  },
  {
    id: 4,
    name: "赵六",
    age: 13,
  },
];
const multipleSelection = ref([]);
const handleSelectionChange = (val: []) => {
  multipleSelection.value = val;
  console.log(val);
};
const handleRowSelect = (row) => {
  tableRef.value!.toggleRowSelection(row, undefined);
};
</script>
<style>
.box {
  width: 600px;
}
</style>

4 以行多选的样式实现行单选-点击checkbox或row,高亮上次选择或反选的行

<template>
  <div class="box">
    <el-table
      ref="tableRef"
      :data="tableData"
      highlight-current-row
      @selection-change="handleSelectionChange"
      @row-click="handleRowSelect"
    >
      <el-table-column type="selection" width="55" />
      <el-table-column prop="id" label="Id" width="180" />
      <el-table-column prop="name" label="Name" width="180" />
      <el-table-column prop="age" label="Age" />
    </el-table>
    <div>选择结果： {{ multipleSelection }}</div>
  </div>
</template>
<script setup lang="ts">
const tableRef = ref();
const tableData = [
  {
    id: 1,
    name: "张三",
    age: 10,
  },
  {
    id: 2,
    name: "李四",
    age: 11,
  },
  {
    id: 3,
    name: "王五",
    age: 12,
  },
  {
    id: 4,
    name: "赵六",
    age: 13,
  },
];
const multipleSelection = ref([]);
const handleSelectionChange = (val: []) => {
  console.log(val);
  if (val.length > 1) {
    tableRef.value!.toggleRowSelection(val[0], val[val.length - 1]);
    multipleSelection.value = [val[val.length - 1]];
  } else {
    multipleSelection.value = val;
  }
};
const handleRowSelect = (row) => {
  tableRef.value!.toggleRowSelection(row, undefined);
};
</script>
<style>
.box {
  width: 600px;
}
</style>

</style>

存在问题：点击表头全选,会不断切换选中行

解决方案：

1.样式覆盖隐藏表头全选(略)

2.插槽实现checkbox

<template>
  <div class="box">
    <el-table
      ref="tableRef"
      :data="tableData"
      highlight-current-row
      @row-click="handleSelectionChange"
    >
      <el-table-column width="55">
        <template #default="{ row }">
          <el-checkbox
            v-model="row.check"
            @click.prevent.stop="handleSelectionChange(row)"
          ></el-checkbox>
        </template>
      </el-table-column>
      <el-table-column prop="id" label="Id" width="180" />
      <el-table-column prop="name" label="Name" width="180" />
      <el-table-column prop="age" label="Age" />
    </el-table>
    <div>选择结果： {{ selection }}</div>
  </div>
</template>
<script setup lang="ts">
const tableRef = ref();
const tableData = ref([
  {
    id: 1,
    name: "张三",
    age: 10,
    check: false,
  },
  {
    id: 2,
    name: "李四",
    age: 11,
    check: false,
  },
  {
    id: 3,
    name: "王五",
    age: 12,
    check: false,
  },
  {
    id: 4,
    name: "赵六",
    age: 13,
    check: false,
  },
]);
const selection = ref();
const handleSelectionChange = (row) => {
  tableRef.value!.setCurrentRow(row);
  selection.value = !row.check ? row : null;
  tableData.value.map((item) => {
    if (item.id !== row.id) {
      item.check = false;
    } else {
      item.check = !row.check;
    }
  });
};
</script>
<style>
.box {
  width: 600px;
}
</style>

5 行单选

只需要配置 highlight-current-row 属性即可实现单选

<template>
  <div class="box">
    <el-table :data="tableData" highlight-current-row>
      <el-table-column prop="id" label="Id" width="180" />
      <el-table-column prop="name" label="Name" width="180" />
      <el-table-column prop="age" label="Age" />
    </el-table>
  </div>
</template>
<script setup lang="ts">
const tableData = [
  {
    id: 1,
    name: "张三",
    age: 10,
  },
  {
    id: 2,
    name: "李四",
    age: 11,
  },
  {
    id: 3,
    name: "王五",
    age: 12,
  },
  {
    id: 4,
    name: "赵六",
    age: 13,
  },
];
</script>
<style>
.box {
  width: 600px;
}
</style>