vue el-table 多选列表上移、下移

在Vue中使用Element UI的el-table组件实现多选列表的上移和下移功能，可以通过数组的splice方法来移动数组中的元素。以下是一个简单的示例：

<template>
  <div>
    <el-button-group>
      <el-button @click="moveUp">上移</el-button>
      <el-button @click="moveDown">下移</el-button>
    </el-button-group>
    <el-table
      :data="tableData"
      style="width: 100%"
      @selection-change="handleSelectionChange"
      ref="multipleTable"
      row-key="id"
    >
      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="date" label="日期" width="120"></el-table-column>
      <el-table-column prop="name" label="姓名" width="120"></el-table-column>
      <el-table-column prop="address" label="地址"></el-table-column>
    </el-table>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      tableData: [
        // ... 填充您的数据
      ],
      multipleSelection: [],
    };
  },
  methods: {
    handleSelectionChange(val) {
      this.multipleSelection = val;
    },
    moveUp() {
      const selection = this.multipleSelection;
      if (selection.length === 0 || selection.some(item => this.tableData.indexOf(item) === 0)) return;
      selection.forEach(item => {
        const currentIndex = this.tableData.indexOf(item);
        const targetIndex = currentIndex - 1;
        this.tableData.splice(currentIndex, 1);
        this.tableData.splice(targetIndex, 0, item);
      });
    },
    moveDown() {
      const selection = this.multipleSelection;
      if (selection.length === 0 || selection.some(item => this.tableData.indexOf(item) === this.tableData.length - 1)) return;
      selection.forEach(item => {
        const currentIndex = this.tableData.indexOf(item);
        const targetIndex = currentIndex + 1;
        this.tableData.splice(currentIndex, 1);
        this.tableData.splice(targetIndex, 0, item);
      });
    },
  },
};
</script>

在这个示例中，moveUp和moveDown方法会根据当前选中的项来移动它们在tableData数组中的位置。handleSelectionChange方法用于更新选中项的数组。按钮点击时触发moveUp或moveDown方法。请确保tableData中的每个对象都有一个唯一的id属性，以便row-key属性能够正确地识别每一行。