vue过滤器保留两位小数

 filters: {
    currency(price) {
      let priceStr = '' + price
      if (priceStr.indexOf('.') > -1) {
        let arr = priceStr.split('.')
        return arr[0] + '.' + (arr[1] + '0').substr(0, 2)
      } else {
        return priceStr + '.00'
      }
    }
  }
}