re-select:记忆选择器库

重新选择 记忆选择器库 该库背后的动机是为了提高用法，使其更具弹性和简洁性。 通过使用新的构造选择器的方法，您应该能够编写更易于组合的选择器。 /* selectors.js ** ** You never call createSelector in your `selectors.js` ** import { createSelector } from 'reselect' */ const shopItemsSelector = state => state . shop . items const taxPercentSelector = state => state . shop . taxPercent // Notice how to use an array structure to describe a selector const subtotalSelecto