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1.安装mathjs

npm install mathjs

2.引入封装

import * as math from 'mathjs';
export default {
  // 加
  add(num1,num2){
    return math.add(math.bignumber(num1),math.bignumber(num2));
  },
  // 乘
  multiply(num1,num2){
    return math.multiply(math.bignumber(num1),math.bignumber(num2));
  },
  // 减
  subtract(num1,num2){
    return math.subtract(math.bignumber(num1),math.bignumber(num2));
  },
  // 除
  divide(num1,num2){
    return math.divide(math.bignumber(num1),math.bignumber(num2));
  }
}

3.调用

      <vxe-column field="notPushDownCount" title="未下推数量" min-width="120">
        <template #default="scope">
          <!--          未下推数量=需求数量-已下推数量-->
          <span v-if="scope.row.level === 1">
            {{
              math.subtract( Number(scope.row.sellingCount),Number(scope.row.pushedDownCount))

          }}</span>
          <span v-else>{{
              math.subtract( Number(scope.row.demandCount),Number(scope.row.pushedDownCount))
          }}</span>
        </template>
      </vxe-column>
<script setup>
import math from '@/utils/math.js'```
<script>