vue+elementui 中 @keyup 键盘上下左右移动聚焦

　　　　　　　　　　　　<template>
      　　　　　　　　　　　　<el-table :data="CreditUnclearOutlineList" border style="width: 100%" ref="table">
                                <el-table-column align="center" prop="name" label="名称" width="150">
                                </el-table-column>
                                <el-table-column align="center" label="正常">
                                    <el-table-column align="center" sortable prop="normalB" label="笔数">
                                        <template scope="scope">
                                            <span>
                                                <el-input style="width: 90px" placeholder="笔数" v-model="scope.row.normalB" @change="handleCreditChange()" class="table_input normalB_input" @keyup.native="show($event,scope.$index)"></el-input>
                                            </span>
                                        </template>
                                    </el-table-column>
                                    <el-table-column align="center" sortable prop="normalY" label="余额(万元)">
                                        <template scope="scope">
                                            <span>
                                                <el-input style="width: 90px" placeholder="余额" v-model="scope.row.normalY" @change="handleCreditChange()" @blur="handleBalanceBlur($event)" @focus="handleBalanceClear($event)" class="table_input normalY_input" @keyup.native="show($event,scope.$index)"></el-input>
                                            </span>
                                        </template>
                                    </el-table-column>
                                </el-table-column>
                                <el-table-column align="center" label="关注">
                                    <el-table-column align="center" sortable prop="focusB" label="笔数">
                                        <template scope="scope">
                                            <span>
                                                <el-input style="width: 90px" placeholder="笔数" v-model="scope.row.focusB" @change="handleCreditChange()" class="table_input focusB_input" @keyup.native="show($event,scope.$index)"></el-input>
                                            </span>
                                        </template>
                                    </el-table-column>
                                    <el-table-column align="center" sortable prop="focusY" label="余额(万元)">
                                        <template scope="scope">
                                            <span>
                                                <el-input style="width: 90px" placeholder="余额" v-model="scope.row.focusY" @change="handleCreditChange()" @blur="handleBalanceBlur($event)" @focus="handleBalanceClear($event)" class="table_input focusY_input" @keyup.native="show($event,scope.$index)"></el-input>
                                            </span>
                                        </template>
                                    </el-table-column>
                                </el-table-column>
                                <el-table-column align="center" label="不良">
                                    <el-table-column align="center" sortable prop="badB" label="笔数">
                                        <template scope="scope">
                                            <span>
                                                <el-input style="width: 90px" placeholder="笔数" v-model="scope.row.badB" @change="handleCreditChange()" class="table_input badB_input" @keyup.native="show($event,scope.$index)"></el-input>
                                            </span>
                                        </template>
                                    </el-table-column>
                                    <el-table-column align="center" sortable prop="badY" label="余额(万元)">
                                        <template scope="scope">
                                            <span>
                                                <el-input style="width: 90px" placeholder="余额" v-model="scope.row.badY" @change="handleCreditChange()" @blur="handleBalanceBlur($event)" @focus="handleBalanceClear($event)" class="table_input badY_input" @keyup.native="show($event,scope.$index)"></el-input>
                                            </span>
                                        </template>
                                    </el-table-column>
                                </el-table-column>
                                <el-table-column align="center" prop="amountY" sortable label="余额(万元)">
                                    <template scope="scope">
                                        <span>{{scope.row.amountY}}</span>
                                    </template>
                                </el-table-column>
                            </el-table>
                        </template>

//键盘触发事件
show(ev,index){

          let newIndex ;

          //通过ev 获取 当前input 名称 用于判断属于哪列
          let clssName = ev.target.offsetParent.className;

          //每一列
          if(clssName.indexOf('normalB_input') != -1){

              newIndex = index*6 ;

          } else if (clssName.indexOf('normalY_input') != -1) {

              newIndex = index*6 + 1 ;

          } else if (clssName.indexOf('focusB_input') != -1) {

              newIndex = index*6 + 2;

          } else if (clssName.indexOf('focusY_input') != -1) {

              newIndex = index*6 + 3;

          } else if (clssName.indexOf('badB_input') != -1) {

              newIndex = index*6 + 4;

          } else if (clssName.indexOf('badY_input') != -1) {

              newIndex = index*6 + 5;

          }

          //获取每一列的input名称
        let normalB_input = document.getElementsByClassName('normalB_input')
        let normalY_input = document.getElementsByClassName('normalY_input')
        let focusB_input = document.getElementsByClassName('focusB_input')
        let focusY_input = document.getElementsByClassName('focusY_input')
        let badB_input = document.getElementsByClassName('badB_input')
        let badY_input = document.getElementsByClassName('badY_input')

        //获取54个input
        let inputAll = document.querySelectorAll('.table_input input');

        //向上 =38
        if(ev.keyCode == 38){
            //当焦点在第一行的时候 按向上的时候焦点要聚焦到前一列的最后一个
            if(newIndex >=1 && newIndex<=5){
                newIndex = newIndex + 47;
            } else {
                newIndex -= 6 ;
            }

            if( inputAll[newIndex] ){

                inputAll[newIndex].focus();

            }

        }

        //下 = 40
        if(ev.keyCode == 40){

            //当newIndex 在最后一行的时候 焦点要聚焦到 下一列的第一个
            if(newIndex>= 48 && newIndex<53){

              newIndex =  (newIndex%8) + 1
            }else {
                newIndex += 6 ;
            }

            if( inputAll[newIndex] ){

                inputAll[newIndex].focus();

            }

        }

        //左 = 37
        if(ev.keyCode == 37){

           newIndex -= 1 ;

            if( inputAll[newIndex] ){

                inputAll[newIndex].focus();

            }
        }

        //右 = 39
        if(ev.keyCode == 39){

            newIndex += 1 ;

            if( inputAll[newIndex] ){

                inputAll[newIndex].focus();

            }
        }

      },

注意点：

1.vue element-ui 绑定@keyup事件无效 ,加上.native覆盖原有封装的keyup事件即可