el-table表格组件内数字加千分位逗号

<template>
  <el-table class="em_table" :data="tableData" stripe :border="true" :size="size">
    <el-table-column v-for=" (column,index) in columns " :key="index" :prop="column.prop " :label="column.label ">
      <template slot-scope="scope">
        <span v-if="column.label !== ‘Area‘">{{formatCurrency(scope.row[column.prop])}}</span>
        <span v-else>{{scope.row[column.prop]}}</span>
      </template>
    </el-table-column>
  </el-table>
</template>