函式：

const digitsRE = /(\d{3})(?=\d)/g

export function currency (value, currency, decimals) {
  value = parseFloat(value)
  if (!isFinite(value) || (!value && value !== 0)) return ''
  currency = currency != null ? currency : '$'
  decimals = decimals != null ? decimals : 2
  var stringified = Math.abs(value).toFixed(decimals)
  var _int = decimals
    ? stringified.slice(0, -1 - decimals)
    : stringified
  var i = _int.length % 3
  var head = i > 0
    ? (_int.slice(0, i) + (_int.length > 3 ? ',' : ''))
    : ''
  var _float = decimals
    ? stringified.slice(-1 - decimals)
    : ''
  var sign = value < 0 ? '-' : ''
  return sign + currency + head +
    _int.slice(i).replace(digitsRE, '$1,') +
    _float
}

引入：

import {currency} from './../util/currency'

　　定義區域性過濾器：

  filters:{
      currency:currency
    },

　　使用：

  <div class="item-total">
                Item total: <span class="total-price">{{totalPrice|currency('$')}}</span>
              </div>

　　全域性過濾器：在main.js

import  {currency} from './util/currency'

Vue.filter("currency",currency);

　　使用：

<div class="cart-tab-4">
         <div class="item-price-total">{{(item.productNum*item.salePrice)|currency('$')}}</div>
 </div>

　　效果：