javascript - 这两个 Promise 的写法是等价的吗？

Question

从教程书中我得到以下代码

  createShoppingList: (store, shoppinglist) => {
    return api.addNewShoppingList(shoppinglist).then(() => {
      store.dispatch('populateShoppingLists')
    }, () => {
      store.commit(types.ADD_SHOPPING_LIST, shoppinglist)
    })
  }

注意 .then() block 后面的逗号

它是否等同于链式 .then() ？

  createShoppingList: (store, shoppinglist) => {
    return api.addNewShoppingList(shoppinglist)
    .then(() => {
      store.dispatch('populateShoppingLists')
    })
    .then(() => {
      store.commit(types.ADD_SHOPPING_LIST, shoppinglist)
    })
  }

或者它只是 .then() 中的一个 block ？喜欢:

return api.addNewShoppingList(shoppinglist)
.then(
() => { store.dispatch('populateShoppingLists')}, 
() => { store.commit(types.ADD_SHOPPING_LIST, shoppinglist) }
)

感谢反馈

Answer 1

没有

.then(resolved, rejected)

不等于

.then(resolve)
.then(rejected)// :/

它非常类似于:

.then(resolved)    
.catch(rejected)

(还是有区别的是then里面的rejection现在会被捕获，而上层版本是不捕获的)