记一下吧，又记不住啦。pipe

currency
date
uppercase
json
limitTo
lowercase
async
decimal
percent

ts ==

import { CurrencyPipe } from '@angular/common';

this.currencyPipe.transform(netSale, 'USD', true, '1.2-2')

html
| currency:'USD':true:'1.2-2'

{{(overView["itemDiscountTotal"]+overView["orderDiscountTotal"])/overView["netSales"] | percent:'1.2-2'}}