el静态表格上移下移置顶_el-table如何置顶某条数据

表格数据如下

<script src="//unpkg.com/vue@2/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.15.13/lib/index.js"></script>
<div id="app">
<template>
  <el-table
    :data="tableData"
    border
    style="width: 100%">
    <el-table-column
      fixed
      type="index"
      label="序号"
      width="50">
    </el-table-column>
    <el-table-column
      fixed
      prop="date"
      label="日期"
      width="150">
    </el-table-column>
    <el-table-column
      prop="name"
      label="姓名"
      width="120">
    </el-table-column>
    <el-table-column
      prop="province"
      label="省份"
      width="120">
    </el-table-column>
    <el-table-column
      prop="city"
      label="市区"
      width="120">
    </el-table-column>
    <el-table-column
      prop="address"
      label="地址"
      width="300">
    </el-table-column>
    <el-table-column
      prop="zip"
      label="邮编"
      width="120">
    </el-table-column>
    <el-table-column
      label="操作"
      width="170">
      <template slot-scope="scope">
        <el-button @click="moveTop(scope.row, scope.$index)" type="text" size="small">置顶</el-button>
        <el-button @click="moveUp(scope.row, scope.$index)" type="text" size="small">上移</el-button>
        <el-button @click="moveDown(scope.row, scope.$index)" type="text" size="small">下移</el-button>
      </template>
    </el-table-column>
  </el-table>
</template>
</div>
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实现方法

var Main = {
    methods: {
      moveTop(row, idx){
        this.tableData.splice(idx, 1)
        this.tableData.unshift(row)
      },
      moveUp(row, idx){
        this.tableData[idx] = this.tableData.splice(idx - 1, 1, row)[0]
      },
      moveDown(row, idx){
        this.tableData[idx] = this.tableData.splice(idx + 1, 1, row)[0]
      },
    },

    data() {
      return {
        tableData: [{
          date: '2016-05-04',
          name: '王小虎',
          province: '上海',
          city: '普陀区',
          address: '上海市普陀区金沙江路 1517 弄',
          zip: 200333
        }, {
          date: '2016-05-02',
          name: '王小虎',
          province: '上海',
          city: '普陀区',
          address: '上海市普陀区金沙江路 1518 弄',
          zip: 200333
        }, {
          date: '2016-05-01',
          name: '王小虎',
          province: '上海',
          city: '普陀区',
          address: '上海市普陀区金沙江路 1519 弄',
          zip: 200333
        }, {
          date: '2016-05-03',
          name: '王小虎',
          province: '上海',
          city: '普陀区',
          address: '上海市普陀区金沙江路 1516 弄',
          zip: 200333
        }]
      }
    }
  }
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')
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