~~~ function logger(store) { return function wrapDispatchToAddLogging(next) { return function dispatchAndLog(action) { console.log('dispatching', action) let result = next(action) console.log('next state', store.getState()) return result } } } ~~~ 现在是“我们该更进一步”的时刻了，所以可能会多花一点时间来让它变的更为合理一些。这些串联函数很吓人。ES6 的箭头函数可以使其 柯里化 ，从而看起来更舒服一些: ~~~ const logger = store => next => action => { console.log('dispatching', action) let result = next(action) console.log('next state', store.getState()) return result } ~~~